https://github.com/trcrsired updated 
https://github.com/llvm/llvm-project/pull/208900

>From 6cabf2c78b79590476555c0066c20083c2c36c52 Mon Sep 17 00:00:00 2001
From: trcrsired <[email protected]>
Date: Sat, 11 Jul 2026 17:56:19 +0800
Subject: [PATCH 1/5] [libcxx] Support freestanding libc++

---
 clang/lib/Headers/errno.h                     | 164 ++++++++++++++++++
 clang/lib/Headers/math.h                      |  29 ++++
 clang/lib/Headers/stdlib.h                    | 103 +++++++++++
 clang/lib/Headers/string.h                    |  65 +++++++
 clang/lib/Headers/wchar.h                     |  62 +++++++
 libcxx/CMakeLists.txt                         |  54 ++++--
 libcxx/include/__algorithm/sort.h             |   4 +
 libcxx/include/__config                       |   4 +
 libcxx/include/__config_site.in               |   3 +
 libcxx/include/ctime                          |   7 +-
 libcxx/include/stdio.h                        |   5 +
 libcxx/test/libcxx/libcpp_freestanding.sh.cpp | 114 ++++++++++++
 12 files changed, 600 insertions(+), 14 deletions(-)
 create mode 100644 clang/lib/Headers/errno.h
 create mode 100644 clang/lib/Headers/math.h
 create mode 100644 clang/lib/Headers/stdlib.h
 create mode 100644 clang/lib/Headers/string.h
 create mode 100644 clang/lib/Headers/wchar.h
 create mode 100644 libcxx/test/libcxx/libcpp_freestanding.sh.cpp

diff --git a/clang/lib/Headers/errno.h b/clang/lib/Headers/errno.h
new file mode 100644
index 0000000000000..48fe84a9304ce
--- /dev/null
+++ b/clang/lib/Headers/errno.h
@@ -0,0 +1,164 @@
+/*===---- errno.h - Standard header for error numbers 
---------------------===*\
+ *
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+\*===----------------------------------------------------------------------===*/
+
+#ifndef __CLANG_ERRNO_H
+#define __CLANG_ERRNO_H
+
+/* If we're hosted, fall back to the system's errno.h, which might have
+ * additional definitions.
+ */
+#if __STDC_HOSTED__ && __has_include_next(<errno.h>)
+
+#include_next <errno.h>
+
+#else
+
+/* Adjusted to the linux asm/errno.h */
+#define EPERM 1            /* Operation not permitted */
+#define ENOENT 2           /* No such file or directory */
+#define ESRCH 3            /* No such process */
+#define EINTR 4            /* Interrupted system call */
+#define EIO 5              /* I/O error */
+#define ENXIO 6            /* No such device or address */
+#define E2BIG 7            /* Arg list too long */
+#define ENOEXEC 8          /* Exec format error */
+#define EBADF 9            /* Bad file number */
+#define ECHILD 10          /* No child processes */
+#define EAGAIN 11          /* Try again */
+#define ENOMEM 12          /* Out of memory */
+#define EACCES 13          /* Permission denied */
+#define EFAULT 14          /* Bad address */
+#define ENOTBLK 15         /* Block device required */
+#define EBUSY 16           /* Device or resource busy */
+#define EEXIST 17          /* File exists */
+#define EXDEV 18           /* Cross-device link */
+#define ENODEV 19          /* No such device */
+#define ENOTDIR 20         /* Not a directory */
+#define EISDIR 21          /* Is a directory */
+#define EINVAL 22          /* Invalid argument */
+#define ENFILE 23          /* File table overflow */
+#define EMFILE 24          /* Too many open files */
+#define ENOTTY 25          /* Not a typewriter */
+#define ETXTBSY 26         /* Text file busy */
+#define EFBIG 27           /* File too large */
+#define ENOSPC 28          /* No space left on device */
+#define ESPIPE 29          /* Illegal seek */
+#define EROFS 30           /* Read-only file system */
+#define EMLINK 31          /* Too many links */
+#define EPIPE 32           /* Broken pipe */
+#define EDOM 33            /* Math argument out of domain of func */
+#define ERANGE 34          /* Math result not representable */
+#define EDEADLK 35         /* Resource deadlock would occur */
+#define ENAMETOOLONG 36    /* File name too long */
+#define ENOLCK 37          /* No record locks available */
+#define ENOSYS 38          /* Function not implemented */
+#define ENOTEMPTY 39       /* Directory not empty */
+#define ELOOP 40           /* Too many symbolic links encountered */
+#define EWOULDBLOCK EAGAIN /* Operation would block */
+#define ENOMSG 42          /* No message of desired type */
+#define EIDRM 43           /* Identifier removed */
+#define ECHRNG 44          /* Channel number out of range */
+#define EL2NSYNC 45        /* Level 2 not synchronized */
+#define EL3HLT 46          /* Level 3 halted */
+#define EL3RST 47          /* Level 3 reset */
+#define ELNRNG 48          /* Link number out of range */
+#define EUNATCH 49         /* Protocol driver not attached */
+#define ENOCSI 50          /* No CSI structure available */
+#define EL2HLT 51          /* Level 2 halted */
+#define EBADE 52           /* Invalid exchange */
+#define EBADR 53           /* Invalid request descriptor */
+#define EXFULL 54          /* Exchange full */
+#define ENOANO 55          /* No anode */
+#define EBADRQC 56         /* Invalid request code */
+#define EBADSLT 57         /* Invalid slot */
+#define EDEADLOCK EDEADLK
+#define EBFONT 59          /* Bad font file format */
+#define EFTYPE EBFONT      /* Inappropriate file type or format */
+#define ENOSTR 60          /* Device not a stream */
+#define ENODATA 61         /* No data available */
+#define ETIME 62           /* Timer expired */
+#define ENOSR 63           /* Out of streams resources */
+#define ENONET 64          /* Machine is not on the network */
+#define ENOPKG 65          /* Package not installed */
+#define EREMOTE 66         /* Object is remote */
+#define ENOLINK 67         /* Link has been severed */
+#define EADV 68            /* Advertise error */
+#define ESRMNT 69          /* Srmount error */
+#define ECOMM 70           /* Communication error on send */
+#define EPROTO 71          /* Protocol error */
+#define EMULTIHOP 72       /* Multihop attempted */
+#define EDOTDOT 73         /* RFS specific error */
+#define EBADMSG 74         /* Not a data message */
+#define EOVERFLOW 75       /* Value too large for defined data type */
+#define ENOTUNIQ 76        /* Name not unique on network */
+#define EBADFD 77          /* File descriptor in bad state */
+#define EREMCHG 78         /* Remote address changed */
+#define ELIBACC 79         /* Can not access a needed shared library */
+#define ELIBBAD 80         /* Accessing a corrupted shared library */
+#define ELIBSCN 81         /* .lib section in a.out corrupted */
+#define ELIBMAX 82         /* Attempting to link in too many shared libraries 
*/
+#define ELIBEXEC 83        /* Cannot exec a shared library directly */
+#define EILSEQ 84          /* Illegal byte sequence */
+#define ERESTART 85        /* Interrupted system call should be restarted */
+#define ESTRPIPE 86        /* Streams pipe error */
+#define EUSERS 87          /* Too many users */
+#define ENOTSOCK 88        /* Socket operation on non-socket */
+#define EDESTADDRREQ 89    /* Destination address required */
+#define EMSGSIZE 90        /* Message too long */
+#define EPROTOTYPE 91      /* Protocol wrong type for socket */
+#define ENOPROTOOPT 92     /* Protocol not available */
+#define EPROTONOSUPPORT 93 /* Protocol not supported */
+#define ESOCKTNOSUPPORT 94 /* Socket type not supported */
+#define EOPNOTSUPP 95      /* Operation not supported on transport endpoint */
+#define EPFNOSUPPORT 96    /* Protocol family not supported */
+#define EAFNOSUPPORT 97    /* Address family not supported by protocol */
+#define EADDRINUSE 98      /* Address already in use */
+#define EADDRNOTAVAIL 99   /* Cannot assign requested address */
+#define ENETDOWN 100       /* Network is down */
+#define ENETUNREACH 101    /* Network is unreachable */
+#define ENETRESET 102      /* Network dropped connection because of reset */
+#define ECONNABORTED 103   /* Software caused connection abort */
+#define ECONNRESET 104     /* Connection reset by peer */
+#define ENOBUFS 105        /* No buffer space available */
+#define EISCONN 106        /* Transport endpoint is already connected */
+#define ENOTCONN 107       /* Transport endpoint is not connected */
+#define ESHUTDOWN 108      /* Cannot send after transport endpoint shutdown */
+#define ETOOMANYREFS 109   /* Too many references: cannot splice */
+#define ETIMEDOUT 110      /* Connection timed out */
+#define ECONNREFUSED 111   /* Connection refused */
+#define EHOSTDOWN 112      /* Host is down */
+#define EHOSTUNREACH 113   /* No route to host */
+#define EALREADY 114       /* Operation already in progress */
+#define EINPROGRESS 115    /* Operation now in progress */
+#define ESTALE 116         /* Stale NFS file handle */
+#define EUCLEAN 117        /* Structure needs cleaning */
+#define ENOTNAM 118        /* Not a XENIX named type file */
+#define ENAVAIL 119        /* No XENIX semaphores available */
+#define EISNAM 120         /* Is a named type file */
+#define EREMOTEIO 121      /* Remote I/O error */
+#define EDQUOT 122         /* Quota exceeded */
+#define ENOMEDIUM 123      /* No medium found */
+#define EMEDIUMTYPE 124    /* Wrong medium type */
+#define ECANCELED 125      /* Operation Canceled */
+#define ENOKEY 126         /* Required key not available */
+#define EKEYEXPIRED 127    /* Key has expired */
+#define EKEYREVOKED 128    /* Key has been revoked */
+#define EKEYREJECTED 129   /* Key was rejected by service */
+#define EOWNERDEAD 130     /* Owner died */
+#define ENOTRECOVERABLE 131 /* State not recoverable */
+#define ERFKILL 132         /* Operation not possible due to RF-kill */
+#define EHWPOISON 133       /* Memory page has hardware error */
+
+/* Widely known to be a synonym in Linux.  */
+#define ENOTSUP EOPNOTSUPP
+
+#define __ELASTERROR 2000 /* Users can add values starting here */
+
+#endif
+
+#endif
diff --git a/clang/lib/Headers/math.h b/clang/lib/Headers/math.h
new file mode 100644
index 0000000000000..3e316c891a1bc
--- /dev/null
+++ b/clang/lib/Headers/math.h
@@ -0,0 +1,29 @@
+/*===---- math.h - Standard header for C math ----------------------------===*\
+ *
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+\*===----------------------------------------------------------------------===*/
+
+#ifndef __CLANG_MATH_H
+#define __CLANG_MATH_H
+
+/* If we're hosted, fall back to the system's math.h, which might have
+ * additional definitions.
+ */
+#if __STDC_HOSTED__ && __has_include_next(<math.h>)
+
+#include_next <math.h>
+
+#else
+
+#define NAN __builtin_nanf("")
+#define INFINITY __builtin_inff()
+#define FP_NAN 0
+#define FP_INFINITE 1
+#define FP_ZERO 2
+#define FP_SUBNORMAL 3
+#define FP_NORMAL 4
+
+#endif
diff --git a/clang/lib/Headers/stdlib.h b/clang/lib/Headers/stdlib.h
new file mode 100644
index 0000000000000..db5fa08385f58
--- /dev/null
+++ b/clang/lib/Headers/stdlib.h
@@ -0,0 +1,103 @@
+/*===---- stdlib.h - Standard header for general utilities 
----------------===*\
+ *
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+\*===----------------------------------------------------------------------===*/
+
+#ifndef __CLANG_STDLIB_H
+#define __CLANG_STDLIB_H
+
+/* If we're hosted, fall back to the system's math.h, which might have
+ * additional definitions.
+ */
+#if __STDC_HOSTED__ && __has_include_next(<stdlib.h>)
+
+#include_next <stdlib.h>
+
+#else
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifndef EXIT_FAILURE
+#define EXIT_FAILURE 1 /* freestanding */
+#endif
+#ifndef EXIT_SUCCESS
+#define EXIT_SUCCESS 0 /* freestanding */
+#endif
+
+#ifndef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+  int quot;
+  int rem;
+} div_t; /* freestanding */
+typedef struct {
+  long quot;
+  long rem;
+} ldiv_t; /* freestanding */
+typedef struct {
+  long long quot;
+  long long rem;
+} lldiv_t; /* freestanding */
+typedef struct {
+  intmax_t quot;
+  intmax_t rem;
+} imaxdiv_t; /* freestanding */
+
+/*
+We offer declarations for these C functions,
+leaving the implementations to be handled by users.
+*/
+
+// start and termination
+
+#ifndef __CLANG_STDLIB_NOEXCEPT
+#ifdef __cplusplus
+#if __cplusplus >= 201103L
+#define __CLANG_STDLIB_NOEXCEPT noexcept
+#else
+#define __CLANG_STDLIB_NOEXCEPT throw()
+#endif
+#else
+#define __CLANG_STDLIB_NOEXCEPT
+#endif
+#endif
+
+[[noreturn]] void abort() __CLANG_STDLIB_NOEXCEPT;         /* freestanding */
+int atexit(void (*)()) __CLANG_STDLIB_NOEXCEPT;            /* freestanding */
+int at_quick_exit(void (*)()) __CLANG_STDLIB_NOEXCEPT;     /* freestanding */
+[[noreturn]] void exit(int);                               /* freestanding */
+[[noreturn]] void _Exit(int) __CLANG_STDLIB_NOEXCEPT;      /* freestanding */
+[[noreturn]] void quick_exit(int) __CLANG_STDLIB_NOEXCEPT; /* freestanding */
+
+#undef __CLANG_STDLIB_NOEXCEPT
+
+// C standard library algorithms
+void *bsearch(const void *, const void *, size_t, size_t,
+              int (*)(const void *, const void *)); /* freestanding */
+void qsort(void *, size_t, size_t,
+           int (*)(const void *, const void *)); /* freestanding */
+
+// absolute values
+int abs(int j);                       /* freestanding */
+long int abs(long int j);             /* freestanding */
+long long int abs(long long int j);   /* freestanding */
+long int labs(long int j);            /* freestanding */
+long long int llabs(long long int j); /* freestanding */
+
+div_t div(int, int);                         /* freestanding */
+ldiv_t div(long int, long int);              /* freestanding */
+lldiv_t div(long long int, long long int);   /* freestanding */
+ldiv_t ldiv(long int, long int);             /* freestanding */
+lldiv_t lldiv(long long int, long long int); /* freestanding */
+
+#ifndef __cplusplus
+}
+#endif
+
+#endif
diff --git a/clang/lib/Headers/string.h b/clang/lib/Headers/string.h
new file mode 100644
index 0000000000000..c256b3e35a95b
--- /dev/null
+++ b/clang/lib/Headers/string.h
@@ -0,0 +1,65 @@
+/*===---- string.h - Standard header for null-terminated string 
-----------===*\
+ *
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+\*===----------------------------------------------------------------------===*/
+
+#ifndef __CLANG_STRING_H
+#define __CLANG_STRING_H
+
+/* If we're hosted, fall back to the system's string.h, which might have
+ * additional definitions.
+ */
+
+#if __STDC_HOSTED__ && __has_include_next(<string.h>)
+
+#include_next <string.h>
+
+#else
+
+#include <stddef.h>
+
+#ifndef __cplusplus
+extern "C" {
+#endif
+
+/*
+We offer declarations for these C functions,
+leaving the implementations to be handled by users.
+*/
+
+void *memcpy(void *, const void *, size_t);      /* freestanding */
+void *memmove(void *, const void *, size_t);     /* freestanding */
+char *strcpy(char *, const char *);              /* freestanding */
+char *strncpy(char *, const char *, size_t);     /* freestanding */
+char *strcat(char *, const char *);              /* freestanding */
+char *strncat(char *, const char *, size_t);     /* freestanding */
+int memcmp(const void *, const void *, size_t);  /* freestanding */
+int strcmp(const char *, const char *);          /* freestanding */
+int strncmp(const char *, const char *, size_t); /* freestanding */
+const void *memchr(const void *, int, size_t);   /* freestanding */
+void *memchr(void *, int, size_t);               /* freestanding */
+const char *strchr(const char *, int);           /* freestanding */
+char *strchr(char *, int);                       /* freestanding */
+size_t strcspn(const char *, const char *);      /* freestanding */
+const char *strpbrk(const char *, const char *); /* freestanding */
+char *strpbrk(char *, const char *);             /* freestanding */
+const char *strrchr(const char *, int);          /* freestanding */
+char *strrchr(char *, int);                      /* freestanding */
+size_t strspn(const char *, const char *);       /* freestanding */
+const char *strstr(const char *, const char *);  /* freestanding */
+char *strstr(char *, const char *);              /* freestanding */
+char *strtok(char *, const char *);              /* freestanding */
+void *memset(void *, int, size_t);               /* freestanding */
+size_t strlen(const char *);                     /* freestanding */
+void *memset_explicit(void *, int, size_t);      /* freestanding */
+
+#ifndef __cplusplus
+}
+#endif
+
+#endif
+
+#endif
diff --git a/clang/lib/Headers/wchar.h b/clang/lib/Headers/wchar.h
new file mode 100644
index 0000000000000..ca232c0cd6356
--- /dev/null
+++ b/clang/lib/Headers/wchar.h
@@ -0,0 +1,62 @@
+/*===---- wchar.h - Standard header for wide character types 
--------------===*\
+ *
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+\*===----------------------------------------------------------------------===*/
+
+#ifndef __CLANG_WCHAR_H
+#define __CLANG_WCHAR_H
+
+/* If we're hosted, fall back to the system's wchar.h, which might have
+ * additional definitions.
+ */
+
+#if __STDC_HOSTED__ && __has_include_next(<wchar.h>)
+
+#include_next <wchar.h>
+
+#else
+
+#ifndef __cplusplus
+extern "C" {
+#endif
+
+/*
+We offer declarations for these C functions,
+leaving the implementations to be handled by users.
+*/
+
+wchar_t *wcscpy(wchar_t *, const wchar_t *);              /* freestanding */
+wchar_t *wcsncpy(wchar_t *, const wchar_t *, size_t);     /* freestanding */
+wchar_t *wmemcpy(wchar_t *, const wchar_t *, size_t);     /* freestanding */
+wchar_t *wmemmove(wchar_t *, const wchar_t *, size_t);    /* freestanding */
+wchar_t *wcscat(wchar_t *, const wchar_t *);              /* freestanding */
+wchar_t *wcsncat(wchar_t *, const wchar_t *, size_t);     /* freestanding */
+int wcscmp(const wchar_t *, const wchar_t *);             /* freestanding */
+int wcsncmp(const wchar_t *, const wchar_t *, size_t);    /* freestanding */
+int wmemcmp(const wchar_t *, const wchar_t *, size_t);    /* freestanding */
+const wchar_t *wcschr(const wchar_t *, wchar_t);          /* freestanding */
+wchar_t *wcschr(wchar_t *, wchar_t);                      /* freestanding */
+size_t wcscspn(const wchar_t *, const wchar_t *);         /* freestanding */
+const wchar_t *wcspbrk(const wchar_t *, const wchar_t *); /* freestanding */
+wchar_t *wcspbrk(wchar_t *, const wchar_t *);             /* freestanding */
+const wchar_t *wcsrchr(const wchar_t *, wchar_t);         /* freestanding */
+wchar_t *wcsrchr(wchar_t *, wchar_t);                     /* freestanding */
+size_t wcsspn(const wchar_t *, const wchar_t *);          /* freestanding */
+const wchar_t *wcsstr(const wchar_t *, const wchar_t *);  /* freestanding */
+wchar_t *wcsstr(wchar_t *, const wchar_t *);              /* freestanding */
+wchar_t *wcstok(wchar_t *, const wchar_t *, wchar_t **);  /* freestanding */
+const wchar_t *wmemchr(const wchar_t *, wchar_t, size_t); /* freestanding */
+wchar_t *wmemchr(wchar_t *, wchar_t, size_t);             /* freestanding */
+size_t wcslen(const wchar_t *);                           /* freestanding */
+wchar_t *wmemset(wchar_t *, wchar_t, size_t);             /* freestanding */
+
+#ifndef __cplusplus
+}
+#endif
+
+#endif
+
+#endif
diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index 31aaf2977a9af..b92ff4b07777a 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -156,21 +156,43 @@ option(LIBCXX_ENABLE_VENDOR_AVAILABILITY_ANNOTATIONS
    the shared library they shipped should turn this on and see 
`include/__configuration/availability.h`
    for more details." OFF)
 
-if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-  set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-shared-gcc.cfg.in")
-elseif(MINGW)
-  set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-mingw.cfg.in")
-elseif(WIN32) # clang-cl
-  if (LIBCXX_ENABLE_SHARED)
-    set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-shared-clangcl.cfg.in")
-  else()
-    set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-static-clangcl.cfg.in")
-  endif()
+option(LIBCXX_FREESTANDING
+   "Build libc++ in freestanding mode. This toggle allows the libc++ to work 
without libc
+    for environments like operating systems kernels or embedded systems." OFF)
+
+if (LIBCXX_FREESTANDING)
+  set(LIBCXX_ENABLE_FILESYSTEM OFF)
+  set(LIBCXX_ENABLE_RANDOM_DEVICE OFF)
+  set(LIBCXX_ENABLE_PARALLEL_ALGORITHMS OFF)
+  set(LIBCXX_ENABLE_SHARED OFF)
+  set(LIBCXX_ENABLE_STATIC OFF)
+  set(CMAKE_ASM_COMPILER_WORKS ON)
+  set(CMAKE_C_COMPILER_WORKS ON)
+  set(CMAKE_CXX_COMPILER_WORKS ON)
+  set(LIBCXX_ENABLE_LOCALIZATION OFF)
+  set(LIBCXX_ENABLE_FSTREAM OFF)
+  set(LIBCXX_ENABLE_STD_MODULES OFF)
+  set(LIBCXX_INCLUDE_BENCHMARKS OFF)
+  set(LIBCXX_ENABLE_WIDE_CHARACTERS OFF)
+  set(LIBCXX_ENABLE_TIME_ZONE_DATABASE OFF)
+  set(LIBCXX_INCLUDE_TESTS Off)
 else()
-  if (LIBCXX_ENABLE_SHARED)
-    set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-shared.cfg.in")
+  if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-shared-gcc.cfg.in")
+  elseif(MINGW)
+    set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-mingw.cfg.in")
+  elseif(WIN32) # clang-cl
+    if (LIBCXX_ENABLE_SHARED)
+      set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-shared-clangcl.cfg.in")
+    else()
+      set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-static-clangcl.cfg.in")
+    endif()
   else()
-    set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-static.cfg.in")
+    if (LIBCXX_ENABLE_SHARED)
+      set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-shared.cfg.in")
+    else()
+      set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-static.cfg.in")
+    endif()
   endif()
 endif()
 set(LIBCXX_TEST_CONFIG "${LIBCXX_DEFAULT_TEST_CONFIG}" CACHE STRING
@@ -901,6 +923,10 @@ if (WIN32 AND LIBCXX_ENABLE_STATIC_ABI_LIBRARY)
   add_definitions(-D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS)
 endif()
 
+if (LIBCXX_FREESTANDING)
+  config_define(LIBCXX_FREESTANDING _LIBCPP_FREESTANDING)
+endif()
+
 # Setup all common build flags 
=================================================
 function(cxx_add_common_build_flags target)
   cxx_add_basic_build_flags(${target})
@@ -920,9 +946,11 @@ add_custom_target(cxx-test-depends
   COMMENT "Build dependencies required to run the libc++ test suite.")
 
 add_subdirectory(include)
+if (NOT LIBCXX_FREESTANDING)
 add_subdirectory(src)
 add_subdirectory(utils)
 add_subdirectory(modules)
+endif()
 
 if (LIBCXX_INCLUDE_TESTS)
   add_subdirectory(test)
diff --git a/libcxx/include/__algorithm/sort.h 
b/libcxx/include/__algorithm/sort.h
index 0a936db78e5fd..f144115ded7e4 100644
--- a/libcxx/include/__algorithm/sort.h
+++ b/libcxx/include/__algorithm/sort.h
@@ -832,6 +832,8 @@ _LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS
 template <class _Comp, class _RandomAccessIterator>
 void __sort(_RandomAccessIterator, _RandomAccessIterator, _Comp);
 
+#if _LIBCPP_FREESTANDING == 0
+
 extern template _LIBCPP_EXPORTED_FROM_ABI void __sort<__less<char>&, 
char*>(char*, char*, __less<char>&);
 #if _LIBCPP_HAS_WIDE_CHARACTERS
 extern template _LIBCPP_EXPORTED_FROM_ABI void __sort<__less<wchar_t>&, 
wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&);
@@ -859,6 +861,8 @@ extern template _LIBCPP_EXPORTED_FROM_ABI void
 __sort<__less<long double>&, long double*>(long double*, long double*, 
__less<long double>&);
 _LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
 
+#endif
+
 template <class _AlgPolicy, class _RandomAccessIterator, class _Comp>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
 __sort_dispatch(_RandomAccessIterator __first, _RandomAccessIterator __last, 
_Comp& __comp) {
diff --git a/libcxx/include/__config b/libcxx/include/__config
index 3f271ff504767..cbfb448189360 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -37,6 +37,10 @@
 // Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), 
_LIBCPP_VERSION is
 // defined to XXYYZZ.
 #  define _LIBCPP_VERSION 230000
+#  if __STDC_HOSTED__ == 0 && _LIBCPP_FREESTANDING == 0
+#    undef _LIBCPP_FREESTANDING
+#    define _LIBCPP_FREESTANDING 1
+#  endif
 
 #  if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
 #    define _LIBCPP_ABI_VCRUNTIME
diff --git a/libcxx/include/__config_site.in b/libcxx/include/__config_site.in
index e6e33a2eeb2a9..4470ce4ca3400 100644
--- a/libcxx/include/__config_site.in
+++ b/libcxx/include/__config_site.in
@@ -32,6 +32,9 @@
 #cmakedefine01 _LIBCPP_HAS_TIME_ZONE_DATABASE
 #cmakedefine01 _LIBCPP_INSTRUMENTED_WITH_ASAN
 
+// Freestanding
+#cmakedefine01 _LIBCPP_FREESTANDING
+
 // PSTL backends
 #cmakedefine _LIBCPP_PSTL_BACKEND_SERIAL
 #cmakedefine _LIBCPP_PSTL_BACKEND_STD_THREAD
diff --git a/libcxx/include/ctime b/libcxx/include/ctime
index 1e845a8de0930..6140faed9550f 100644
--- a/libcxx/include/ctime
+++ b/libcxx/include/ctime
@@ -52,11 +52,16 @@ int timespec_get( struct timespec *ts, int base); // C++17
 #  include <__cstddef/size_t.h>
 
 // <time.h> is not provided by libc++
-#  if __has_include(<time.h>)
+#  if __STDC_HOSTED__ && __has_include(<time.h>)
 #    include <time.h>
 #    ifdef _LIBCPP_TIME_H
 #      error "If libc++ starts defining <time.h>, the __has_include check 
should move to libc++'s <time.h>"
 #    endif
+#  else
+#    include <cstdint>
+extern "C" {
+typedef ::std::uint_least64_t time_t;
+}
 #  endif
 
 #  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
diff --git a/libcxx/include/stdio.h b/libcxx/include/stdio.h
index 4ce98d178ed2f..e42485542d347 100644
--- a/libcxx/include/stdio.h
+++ b/libcxx/include/stdio.h
@@ -102,6 +102,11 @@ void perror(const char* s);
 // times to get different definitions based on the macros that are set before 
inclusion.
 #if __has_include_next(<stdio.h>)
 #  include_next <stdio.h>
+#else
+#  ifndef EOF
+#    define EOF (-1)
+#  endif
+#endif
 #endif
 
 #ifndef _LIBCPP_STDIO_H
diff --git a/libcxx/test/libcxx/libcpp_freestanding.sh.cpp 
b/libcxx/test/libcxx/libcpp_freestanding.sh.cpp
new file mode 100644
index 0000000000000..b76e95089190e
--- /dev/null
+++ b/libcxx/test/libcxx/libcpp_freestanding.sh.cpp
@@ -0,0 +1,114 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Test that _LIBCPP_FREESTANDING is not defined when -ffreestanding is not 
passed
+// to the compiler but defined when -ffreestanding is passed to the compiler.
+
+// RUN: %{cxx} %{flags} %{compile_flags} -fsyntax-only %s
+// RUN: %{cxx} %{flags} %{compile_flags} -fsyntax-only -ffreestanding 
-DFREESTANDING %s
+// RUN: %{cxx} %{flags} %{compile_flags} -fsyntax-only -ffreestanding %s
+
+#include <__config>
+
+#if defined(FREESTANDING) != defined(_LIBCPP_FREESTANDING)
+#  error _LIBCPP_FREESTANDING should be defined in freestanding mode and not \
+       defined in non-freestanding mode
+#  if defined(__has_feature)
+#    if __has_feature(modules)
+#      define _LIBCPP_FREESTANDING_NO_TEST_MODULES
+#    endif
+#  elif defined(__cpp_modules)
+#    define _LIBCPP_FREESTANDING_NO_TEST_MODULES
+#  endif
+
+#  if _LIBCPP_FREESTANDING && !defined(_LIBCPP_FREESTANDING_NO_TEST_MODULES)
+#    include <cstddef>
+#    include <limits>
+#    include <cfloat>
+#    include <version>
+#    include <cstdint>
+#    include <cstdlib>
+#    include <new>
+#    include <typeinfo>
+#    if __has_include(<source_location>)
+#      include <source_location>
+#    endif
+#    include <exception>
+#    include <initializer_list>
+#    include <compare>
+#    include <coroutine>
+#    include <cstdarg>
+#    include <concepts>
+#    include <type_traits>
+#    include <bit>
+#    include <atomic>
+#    include <utility>
+#    include <tuple>
+#    include <memory>
+#    include <functional>
+#    include <ratio>
+#    include <iterator>
+#    include <ranges>
+#    include <typeinfo>
+
+/*
+We tested these headers are for preventing build issues
+*/
+#    include <iosfwd>
+#    include <cstdio>
+#    include <cerrno>
+#    include <cstring>
+#    include <cmath>
+#    ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#      include <cwchar>
+#    endif
+#    include <array>
+#    include <span>
+#    include <algorithm>
+#    include <bitset>
+#    include <variant>
+#    include <optional>
+#    include <numbers>
+#    include <scoped_allocator>
+#    include <typeindex>
+#    include <string_view>
+#    include <numeric>
+#    include <complex>
+#    include <chrono>
+#    include <charconv>
+#    include <expected>
+#    include <random>
+#    include <any>
+
+/*
++ * libc++ Containers Extensions
++ */
+#    include <vector>
+#    include <deque>
+#    include <string>
+#    include <stack>
+#    include <queue>
+#    include <list>
+#    include <forward_list>
+#    include <map>
+#    include <set>
+#    include <unordered_set>
+#    include <unordered_map>
+#    if __has_include(<mdspan>)
+#      include <mdspan>
+#    endif
+#    include <valarray>
+
+#    if _LIBCPP_STD_VER < 20
+#      include <ciso646>
+#      if __has_include(<cstdalign>)
+#        include <cstdalign>
+#      endif
+#      include <cstdbool>
+#    endif
+#  endif

>From 259f4c59ffcdd906df3383d5abd199ad54646020 Mon Sep 17 00:00:00 2001
From: trcrsired <[email protected]>
Date: Sat, 11 Jul 2026 19:10:08 +0800
Subject: [PATCH 2/5] [skip ci][libcxx] freestanding has no threads

---
 libcxx/include/__config | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libcxx/include/__config b/libcxx/include/__config
index cbfb448189360..2d047676817d0 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -234,6 +234,7 @@ typedef __char32_t char32_t;
 #    elif defined(_LIBCPP_WIN32API)
 #      undef _LIBCPP_HAS_THREAD_API_WIN32
 #      define _LIBCPP_HAS_THREAD_API_WIN32 1
+#    elif _LIBCPP_FREESTANDING != 0
 #    else
 #      error "No thread API"
 #    endif // _LIBCPP_HAS_THREAD_API

>From 027f7c01358272d9950c8e0438caf67a0a06e863 Mon Sep 17 00:00:00 2001
From: trcrsired <[email protected]>
Date: Sat, 11 Jul 2026 19:19:02 +0800
Subject: [PATCH 3/5] [skip ci][libcxx] stdio.h #endif missing

---
 libcxx/include/stdio.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/libcxx/include/stdio.h b/libcxx/include/stdio.h
index e42485542d347..28d86a60ef247 100644
--- a/libcxx/include/stdio.h
+++ b/libcxx/include/stdio.h
@@ -107,7 +107,6 @@ void perror(const char* s);
 #    define EOF (-1)
 #  endif
 #endif
-#endif
 
 #ifndef _LIBCPP_STDIO_H
 #  define _LIBCPP_STDIO_H

>From 3231856456ab14b463e4165444a686450ae98b3b Mon Sep 17 00:00:00 2001
From: trcrsired <[email protected]>
Date: Sun, 12 Jul 2026 21:31:59 +0800
Subject: [PATCH 4/5] [libcxx] freestanding cxx trick to make it support
 freestanding

---
 clang/lib/Headers/errno.h         | 164 ------------------------------
 clang/lib/Headers/math.h          |  29 ------
 clang/lib/Headers/stdlib.h        | 103 -------------------
 clang/lib/Headers/string.h        |  65 ------------
 clang/lib/Headers/wchar.h         |  62 -----------
 libcxx/CMakeLists.txt             |   1 +
 libcxx/include/__algorithm/sort.h |   6 +-
 libcxx/include/__mbstate_t.h      |  10 ++
 libcxx/include/stdio.h            |  11 ++
 libcxx/include/string.h           |  42 +++++++-
 10 files changed, 64 insertions(+), 429 deletions(-)
 delete mode 100644 clang/lib/Headers/errno.h
 delete mode 100644 clang/lib/Headers/math.h
 delete mode 100644 clang/lib/Headers/stdlib.h
 delete mode 100644 clang/lib/Headers/string.h
 delete mode 100644 clang/lib/Headers/wchar.h

diff --git a/clang/lib/Headers/errno.h b/clang/lib/Headers/errno.h
deleted file mode 100644
index 48fe84a9304ce..0000000000000
--- a/clang/lib/Headers/errno.h
+++ /dev/null
@@ -1,164 +0,0 @@
-/*===---- errno.h - Standard header for error numbers 
---------------------===*\
- *
- * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
- * See https://llvm.org/LICENSE.txt for license information.
- * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- *
-\*===----------------------------------------------------------------------===*/
-
-#ifndef __CLANG_ERRNO_H
-#define __CLANG_ERRNO_H
-
-/* If we're hosted, fall back to the system's errno.h, which might have
- * additional definitions.
- */
-#if __STDC_HOSTED__ && __has_include_next(<errno.h>)
-
-#include_next <errno.h>
-
-#else
-
-/* Adjusted to the linux asm/errno.h */
-#define EPERM 1            /* Operation not permitted */
-#define ENOENT 2           /* No such file or directory */
-#define ESRCH 3            /* No such process */
-#define EINTR 4            /* Interrupted system call */
-#define EIO 5              /* I/O error */
-#define ENXIO 6            /* No such device or address */
-#define E2BIG 7            /* Arg list too long */
-#define ENOEXEC 8          /* Exec format error */
-#define EBADF 9            /* Bad file number */
-#define ECHILD 10          /* No child processes */
-#define EAGAIN 11          /* Try again */
-#define ENOMEM 12          /* Out of memory */
-#define EACCES 13          /* Permission denied */
-#define EFAULT 14          /* Bad address */
-#define ENOTBLK 15         /* Block device required */
-#define EBUSY 16           /* Device or resource busy */
-#define EEXIST 17          /* File exists */
-#define EXDEV 18           /* Cross-device link */
-#define ENODEV 19          /* No such device */
-#define ENOTDIR 20         /* Not a directory */
-#define EISDIR 21          /* Is a directory */
-#define EINVAL 22          /* Invalid argument */
-#define ENFILE 23          /* File table overflow */
-#define EMFILE 24          /* Too many open files */
-#define ENOTTY 25          /* Not a typewriter */
-#define ETXTBSY 26         /* Text file busy */
-#define EFBIG 27           /* File too large */
-#define ENOSPC 28          /* No space left on device */
-#define ESPIPE 29          /* Illegal seek */
-#define EROFS 30           /* Read-only file system */
-#define EMLINK 31          /* Too many links */
-#define EPIPE 32           /* Broken pipe */
-#define EDOM 33            /* Math argument out of domain of func */
-#define ERANGE 34          /* Math result not representable */
-#define EDEADLK 35         /* Resource deadlock would occur */
-#define ENAMETOOLONG 36    /* File name too long */
-#define ENOLCK 37          /* No record locks available */
-#define ENOSYS 38          /* Function not implemented */
-#define ENOTEMPTY 39       /* Directory not empty */
-#define ELOOP 40           /* Too many symbolic links encountered */
-#define EWOULDBLOCK EAGAIN /* Operation would block */
-#define ENOMSG 42          /* No message of desired type */
-#define EIDRM 43           /* Identifier removed */
-#define ECHRNG 44          /* Channel number out of range */
-#define EL2NSYNC 45        /* Level 2 not synchronized */
-#define EL3HLT 46          /* Level 3 halted */
-#define EL3RST 47          /* Level 3 reset */
-#define ELNRNG 48          /* Link number out of range */
-#define EUNATCH 49         /* Protocol driver not attached */
-#define ENOCSI 50          /* No CSI structure available */
-#define EL2HLT 51          /* Level 2 halted */
-#define EBADE 52           /* Invalid exchange */
-#define EBADR 53           /* Invalid request descriptor */
-#define EXFULL 54          /* Exchange full */
-#define ENOANO 55          /* No anode */
-#define EBADRQC 56         /* Invalid request code */
-#define EBADSLT 57         /* Invalid slot */
-#define EDEADLOCK EDEADLK
-#define EBFONT 59          /* Bad font file format */
-#define EFTYPE EBFONT      /* Inappropriate file type or format */
-#define ENOSTR 60          /* Device not a stream */
-#define ENODATA 61         /* No data available */
-#define ETIME 62           /* Timer expired */
-#define ENOSR 63           /* Out of streams resources */
-#define ENONET 64          /* Machine is not on the network */
-#define ENOPKG 65          /* Package not installed */
-#define EREMOTE 66         /* Object is remote */
-#define ENOLINK 67         /* Link has been severed */
-#define EADV 68            /* Advertise error */
-#define ESRMNT 69          /* Srmount error */
-#define ECOMM 70           /* Communication error on send */
-#define EPROTO 71          /* Protocol error */
-#define EMULTIHOP 72       /* Multihop attempted */
-#define EDOTDOT 73         /* RFS specific error */
-#define EBADMSG 74         /* Not a data message */
-#define EOVERFLOW 75       /* Value too large for defined data type */
-#define ENOTUNIQ 76        /* Name not unique on network */
-#define EBADFD 77          /* File descriptor in bad state */
-#define EREMCHG 78         /* Remote address changed */
-#define ELIBACC 79         /* Can not access a needed shared library */
-#define ELIBBAD 80         /* Accessing a corrupted shared library */
-#define ELIBSCN 81         /* .lib section in a.out corrupted */
-#define ELIBMAX 82         /* Attempting to link in too many shared libraries 
*/
-#define ELIBEXEC 83        /* Cannot exec a shared library directly */
-#define EILSEQ 84          /* Illegal byte sequence */
-#define ERESTART 85        /* Interrupted system call should be restarted */
-#define ESTRPIPE 86        /* Streams pipe error */
-#define EUSERS 87          /* Too many users */
-#define ENOTSOCK 88        /* Socket operation on non-socket */
-#define EDESTADDRREQ 89    /* Destination address required */
-#define EMSGSIZE 90        /* Message too long */
-#define EPROTOTYPE 91      /* Protocol wrong type for socket */
-#define ENOPROTOOPT 92     /* Protocol not available */
-#define EPROTONOSUPPORT 93 /* Protocol not supported */
-#define ESOCKTNOSUPPORT 94 /* Socket type not supported */
-#define EOPNOTSUPP 95      /* Operation not supported on transport endpoint */
-#define EPFNOSUPPORT 96    /* Protocol family not supported */
-#define EAFNOSUPPORT 97    /* Address family not supported by protocol */
-#define EADDRINUSE 98      /* Address already in use */
-#define EADDRNOTAVAIL 99   /* Cannot assign requested address */
-#define ENETDOWN 100       /* Network is down */
-#define ENETUNREACH 101    /* Network is unreachable */
-#define ENETRESET 102      /* Network dropped connection because of reset */
-#define ECONNABORTED 103   /* Software caused connection abort */
-#define ECONNRESET 104     /* Connection reset by peer */
-#define ENOBUFS 105        /* No buffer space available */
-#define EISCONN 106        /* Transport endpoint is already connected */
-#define ENOTCONN 107       /* Transport endpoint is not connected */
-#define ESHUTDOWN 108      /* Cannot send after transport endpoint shutdown */
-#define ETOOMANYREFS 109   /* Too many references: cannot splice */
-#define ETIMEDOUT 110      /* Connection timed out */
-#define ECONNREFUSED 111   /* Connection refused */
-#define EHOSTDOWN 112      /* Host is down */
-#define EHOSTUNREACH 113   /* No route to host */
-#define EALREADY 114       /* Operation already in progress */
-#define EINPROGRESS 115    /* Operation now in progress */
-#define ESTALE 116         /* Stale NFS file handle */
-#define EUCLEAN 117        /* Structure needs cleaning */
-#define ENOTNAM 118        /* Not a XENIX named type file */
-#define ENAVAIL 119        /* No XENIX semaphores available */
-#define EISNAM 120         /* Is a named type file */
-#define EREMOTEIO 121      /* Remote I/O error */
-#define EDQUOT 122         /* Quota exceeded */
-#define ENOMEDIUM 123      /* No medium found */
-#define EMEDIUMTYPE 124    /* Wrong medium type */
-#define ECANCELED 125      /* Operation Canceled */
-#define ENOKEY 126         /* Required key not available */
-#define EKEYEXPIRED 127    /* Key has expired */
-#define EKEYREVOKED 128    /* Key has been revoked */
-#define EKEYREJECTED 129   /* Key was rejected by service */
-#define EOWNERDEAD 130     /* Owner died */
-#define ENOTRECOVERABLE 131 /* State not recoverable */
-#define ERFKILL 132         /* Operation not possible due to RF-kill */
-#define EHWPOISON 133       /* Memory page has hardware error */
-
-/* Widely known to be a synonym in Linux.  */
-#define ENOTSUP EOPNOTSUPP
-
-#define __ELASTERROR 2000 /* Users can add values starting here */
-
-#endif
-
-#endif
diff --git a/clang/lib/Headers/math.h b/clang/lib/Headers/math.h
deleted file mode 100644
index 3e316c891a1bc..0000000000000
--- a/clang/lib/Headers/math.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*===---- math.h - Standard header for C math ----------------------------===*\
- *
- * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
- * See https://llvm.org/LICENSE.txt for license information.
- * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- *
-\*===----------------------------------------------------------------------===*/
-
-#ifndef __CLANG_MATH_H
-#define __CLANG_MATH_H
-
-/* If we're hosted, fall back to the system's math.h, which might have
- * additional definitions.
- */
-#if __STDC_HOSTED__ && __has_include_next(<math.h>)
-
-#include_next <math.h>
-
-#else
-
-#define NAN __builtin_nanf("")
-#define INFINITY __builtin_inff()
-#define FP_NAN 0
-#define FP_INFINITE 1
-#define FP_ZERO 2
-#define FP_SUBNORMAL 3
-#define FP_NORMAL 4
-
-#endif
diff --git a/clang/lib/Headers/stdlib.h b/clang/lib/Headers/stdlib.h
deleted file mode 100644
index db5fa08385f58..0000000000000
--- a/clang/lib/Headers/stdlib.h
+++ /dev/null
@@ -1,103 +0,0 @@
-/*===---- stdlib.h - Standard header for general utilities 
----------------===*\
- *
- * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
- * See https://llvm.org/LICENSE.txt for license information.
- * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- *
-\*===----------------------------------------------------------------------===*/
-
-#ifndef __CLANG_STDLIB_H
-#define __CLANG_STDLIB_H
-
-/* If we're hosted, fall back to the system's math.h, which might have
- * additional definitions.
- */
-#if __STDC_HOSTED__ && __has_include_next(<stdlib.h>)
-
-#include_next <stdlib.h>
-
-#else
-
-#include <stddef.h>
-#include <stdint.h>
-
-#ifndef EXIT_FAILURE
-#define EXIT_FAILURE 1 /* freestanding */
-#endif
-#ifndef EXIT_SUCCESS
-#define EXIT_SUCCESS 0 /* freestanding */
-#endif
-
-#ifndef __cplusplus
-extern "C" {
-#endif
-
-typedef struct {
-  int quot;
-  int rem;
-} div_t; /* freestanding */
-typedef struct {
-  long quot;
-  long rem;
-} ldiv_t; /* freestanding */
-typedef struct {
-  long long quot;
-  long long rem;
-} lldiv_t; /* freestanding */
-typedef struct {
-  intmax_t quot;
-  intmax_t rem;
-} imaxdiv_t; /* freestanding */
-
-/*
-We offer declarations for these C functions,
-leaving the implementations to be handled by users.
-*/
-
-// start and termination
-
-#ifndef __CLANG_STDLIB_NOEXCEPT
-#ifdef __cplusplus
-#if __cplusplus >= 201103L
-#define __CLANG_STDLIB_NOEXCEPT noexcept
-#else
-#define __CLANG_STDLIB_NOEXCEPT throw()
-#endif
-#else
-#define __CLANG_STDLIB_NOEXCEPT
-#endif
-#endif
-
-[[noreturn]] void abort() __CLANG_STDLIB_NOEXCEPT;         /* freestanding */
-int atexit(void (*)()) __CLANG_STDLIB_NOEXCEPT;            /* freestanding */
-int at_quick_exit(void (*)()) __CLANG_STDLIB_NOEXCEPT;     /* freestanding */
-[[noreturn]] void exit(int);                               /* freestanding */
-[[noreturn]] void _Exit(int) __CLANG_STDLIB_NOEXCEPT;      /* freestanding */
-[[noreturn]] void quick_exit(int) __CLANG_STDLIB_NOEXCEPT; /* freestanding */
-
-#undef __CLANG_STDLIB_NOEXCEPT
-
-// C standard library algorithms
-void *bsearch(const void *, const void *, size_t, size_t,
-              int (*)(const void *, const void *)); /* freestanding */
-void qsort(void *, size_t, size_t,
-           int (*)(const void *, const void *)); /* freestanding */
-
-// absolute values
-int abs(int j);                       /* freestanding */
-long int abs(long int j);             /* freestanding */
-long long int abs(long long int j);   /* freestanding */
-long int labs(long int j);            /* freestanding */
-long long int llabs(long long int j); /* freestanding */
-
-div_t div(int, int);                         /* freestanding */
-ldiv_t div(long int, long int);              /* freestanding */
-lldiv_t div(long long int, long long int);   /* freestanding */
-ldiv_t ldiv(long int, long int);             /* freestanding */
-lldiv_t lldiv(long long int, long long int); /* freestanding */
-
-#ifndef __cplusplus
-}
-#endif
-
-#endif
diff --git a/clang/lib/Headers/string.h b/clang/lib/Headers/string.h
deleted file mode 100644
index c256b3e35a95b..0000000000000
--- a/clang/lib/Headers/string.h
+++ /dev/null
@@ -1,65 +0,0 @@
-/*===---- string.h - Standard header for null-terminated string 
-----------===*\
- *
- * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
- * See https://llvm.org/LICENSE.txt for license information.
- * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- *
-\*===----------------------------------------------------------------------===*/
-
-#ifndef __CLANG_STRING_H
-#define __CLANG_STRING_H
-
-/* If we're hosted, fall back to the system's string.h, which might have
- * additional definitions.
- */
-
-#if __STDC_HOSTED__ && __has_include_next(<string.h>)
-
-#include_next <string.h>
-
-#else
-
-#include <stddef.h>
-
-#ifndef __cplusplus
-extern "C" {
-#endif
-
-/*
-We offer declarations for these C functions,
-leaving the implementations to be handled by users.
-*/
-
-void *memcpy(void *, const void *, size_t);      /* freestanding */
-void *memmove(void *, const void *, size_t);     /* freestanding */
-char *strcpy(char *, const char *);              /* freestanding */
-char *strncpy(char *, const char *, size_t);     /* freestanding */
-char *strcat(char *, const char *);              /* freestanding */
-char *strncat(char *, const char *, size_t);     /* freestanding */
-int memcmp(const void *, const void *, size_t);  /* freestanding */
-int strcmp(const char *, const char *);          /* freestanding */
-int strncmp(const char *, const char *, size_t); /* freestanding */
-const void *memchr(const void *, int, size_t);   /* freestanding */
-void *memchr(void *, int, size_t);               /* freestanding */
-const char *strchr(const char *, int);           /* freestanding */
-char *strchr(char *, int);                       /* freestanding */
-size_t strcspn(const char *, const char *);      /* freestanding */
-const char *strpbrk(const char *, const char *); /* freestanding */
-char *strpbrk(char *, const char *);             /* freestanding */
-const char *strrchr(const char *, int);          /* freestanding */
-char *strrchr(char *, int);                      /* freestanding */
-size_t strspn(const char *, const char *);       /* freestanding */
-const char *strstr(const char *, const char *);  /* freestanding */
-char *strstr(char *, const char *);              /* freestanding */
-char *strtok(char *, const char *);              /* freestanding */
-void *memset(void *, int, size_t);               /* freestanding */
-size_t strlen(const char *);                     /* freestanding */
-void *memset_explicit(void *, int, size_t);      /* freestanding */
-
-#ifndef __cplusplus
-}
-#endif
-
-#endif
-
-#endif
diff --git a/clang/lib/Headers/wchar.h b/clang/lib/Headers/wchar.h
deleted file mode 100644
index ca232c0cd6356..0000000000000
--- a/clang/lib/Headers/wchar.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/*===---- wchar.h - Standard header for wide character types 
--------------===*\
- *
- * Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
- * See https://llvm.org/LICENSE.txt for license information.
- * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- *
-\*===----------------------------------------------------------------------===*/
-
-#ifndef __CLANG_WCHAR_H
-#define __CLANG_WCHAR_H
-
-/* If we're hosted, fall back to the system's wchar.h, which might have
- * additional definitions.
- */
-
-#if __STDC_HOSTED__ && __has_include_next(<wchar.h>)
-
-#include_next <wchar.h>
-
-#else
-
-#ifndef __cplusplus
-extern "C" {
-#endif
-
-/*
-We offer declarations for these C functions,
-leaving the implementations to be handled by users.
-*/
-
-wchar_t *wcscpy(wchar_t *, const wchar_t *);              /* freestanding */
-wchar_t *wcsncpy(wchar_t *, const wchar_t *, size_t);     /* freestanding */
-wchar_t *wmemcpy(wchar_t *, const wchar_t *, size_t);     /* freestanding */
-wchar_t *wmemmove(wchar_t *, const wchar_t *, size_t);    /* freestanding */
-wchar_t *wcscat(wchar_t *, const wchar_t *);              /* freestanding */
-wchar_t *wcsncat(wchar_t *, const wchar_t *, size_t);     /* freestanding */
-int wcscmp(const wchar_t *, const wchar_t *);             /* freestanding */
-int wcsncmp(const wchar_t *, const wchar_t *, size_t);    /* freestanding */
-int wmemcmp(const wchar_t *, const wchar_t *, size_t);    /* freestanding */
-const wchar_t *wcschr(const wchar_t *, wchar_t);          /* freestanding */
-wchar_t *wcschr(wchar_t *, wchar_t);                      /* freestanding */
-size_t wcscspn(const wchar_t *, const wchar_t *);         /* freestanding */
-const wchar_t *wcspbrk(const wchar_t *, const wchar_t *); /* freestanding */
-wchar_t *wcspbrk(wchar_t *, const wchar_t *);             /* freestanding */
-const wchar_t *wcsrchr(const wchar_t *, wchar_t);         /* freestanding */
-wchar_t *wcsrchr(wchar_t *, wchar_t);                     /* freestanding */
-size_t wcsspn(const wchar_t *, const wchar_t *);          /* freestanding */
-const wchar_t *wcsstr(const wchar_t *, const wchar_t *);  /* freestanding */
-wchar_t *wcsstr(wchar_t *, const wchar_t *);              /* freestanding */
-wchar_t *wcstok(wchar_t *, const wchar_t *, wchar_t **);  /* freestanding */
-const wchar_t *wmemchr(const wchar_t *, wchar_t, size_t); /* freestanding */
-wchar_t *wmemchr(wchar_t *, wchar_t, size_t);             /* freestanding */
-size_t wcslen(const wchar_t *);                           /* freestanding */
-wchar_t *wmemset(wchar_t *, wchar_t, size_t);             /* freestanding */
-
-#ifndef __cplusplus
-}
-#endif
-
-#endif
-
-#endif
diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index b92ff4b07777a..ee9be266975fc 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -176,6 +176,7 @@ if (LIBCXX_FREESTANDING)
   set(LIBCXX_ENABLE_WIDE_CHARACTERS OFF)
   set(LIBCXX_ENABLE_TIME_ZONE_DATABASE OFF)
   set(LIBCXX_INCLUDE_TESTS Off)
+  set(LIBCXX_ENABLE_THREADS Off)
 else()
   if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     set(LIBCXX_DEFAULT_TEST_CONFIG "llvm-libc++-shared-gcc.cfg.in")
diff --git a/libcxx/include/__algorithm/sort.h 
b/libcxx/include/__algorithm/sort.h
index f144115ded7e4..681eaac3ecb07 100644
--- a/libcxx/include/__algorithm/sort.h
+++ b/libcxx/include/__algorithm/sort.h
@@ -828,12 +828,11 @@ void __introsort(_RandomAccessIterator __first,
   }
 }
 
+#if _LIBCPP_FREESTANDING != 0
 _LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS
 template <class _Comp, class _RandomAccessIterator>
 void __sort(_RandomAccessIterator, _RandomAccessIterator, _Comp);
 
-#if _LIBCPP_FREESTANDING == 0
-
 extern template _LIBCPP_EXPORTED_FROM_ABI void __sort<__less<char>&, 
char*>(char*, char*, __less<char>&);
 #if _LIBCPP_HAS_WIDE_CHARACTERS
 extern template _LIBCPP_EXPORTED_FROM_ABI void __sort<__less<wchar_t>&, 
wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&);
@@ -860,7 +859,6 @@ extern template _LIBCPP_EXPORTED_FROM_ABI void 
__sort<__less<double>&, double*>(
 extern template _LIBCPP_EXPORTED_FROM_ABI void
 __sort<__less<long double>&, long double*>(long double*, long double*, 
__less<long double>&);
 _LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
-
 #endif
 
 template <class _AlgPolicy, class _RandomAccessIterator, class _Comp>
@@ -961,4 +959,4 @@ _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
 
-#endif // _LIBCPP___ALGORITHM_SORT_H
+#endif // _LIBCPP___ALGORITHM_SORT_H
\ No newline at end of file
diff --git a/libcxx/include/__mbstate_t.h b/libcxx/include/__mbstate_t.h
index 1ce5f0cd6da1d..dce7ad7ca9196 100644
--- a/libcxx/include/__mbstate_t.h
+++ b/libcxx/include/__mbstate_t.h
@@ -51,6 +51,16 @@
 #  include_next <wchar.h> // use the C standard provider of mbstate_t if 
present
 #elif __has_include_next(<uchar.h>)
 #  include_next <uchar.h> // Try <uchar.h> in absence of <wchar.h> for 
mbstate_t
+#elif _LIBCPP_FREESTANDING != 0
+#  ifdef __cplusplus
+extern "C" {
+#  endif
+typedef struct {
+  int __fill[6];
+} mbstate_t;
+#  ifdef __cplusplus
+}
+#  endif
 #else
 #  error "We don't know how to get the definition of mbstate_t on your 
platform."
 #endif
diff --git a/libcxx/include/stdio.h b/libcxx/include/stdio.h
index 28d86a60ef247..534ceb8188428 100644
--- a/libcxx/include/stdio.h
+++ b/libcxx/include/stdio.h
@@ -122,4 +122,15 @@ void perror(const char* s);
 #    undef getchar
 
 #  endif // __cplusplus
+
+#  if !__has_include_next(<stdio.h>)
+#    ifdef __cplusplus
+extern "C" {
+#    endif // __cplusplus
+int remove(const char*);
+#    ifdef __cplusplus
+}
+#    endif // __cplusplus
+#  endif
+
 #endif   // _LIBCPP_STDIO_H
diff --git a/libcxx/include/string.h b/libcxx/include/string.h
index 2ffcb913010b6..9d3f20adb783e 100644
--- a/libcxx/include/string.h
+++ b/libcxx/include/string.h
@@ -60,11 +60,49 @@ size_t strlen(const char* s);
 #    pragma GCC system_header
 #  endif
 
+#  include <stddef.h>
 #  if __has_include_next(<string.h>)
 #    include_next <string.h>
-#  endif
+#  else
+#    ifndef __cplusplus
+extern "C" {
+#    endif
 
-#  include <stddef.h>
+/*
+We offer declarations for these C functions,
+leaving the implementations to be handled by users.
+*/
+
+void* memcpy(void*, const void*, size_t);      /* freestanding */
+void* memmove(void*, const void*, size_t);     /* freestanding */
+char* strcpy(char*, const char*);              /* freestanding */
+char* strncpy(char*, const char*, size_t);     /* freestanding */
+char* strcat(char*, const char*);              /* freestanding */
+char* strncat(char*, const char*, size_t);     /* freestanding */
+int memcmp(const void*, const void*, size_t);  /* freestanding */
+int strcmp(const char*, const char*);          /* freestanding */
+int strncmp(const char*, const char*, size_t); /* freestanding */
+const void* memchr(const void*, int, size_t);  /* freestanding */
+void* memchr(void*, int, size_t);              /* freestanding */
+const char* strchr(const char*, int);          /* freestanding */
+char* strchr(char*, int);                      /* freestanding */
+size_t strcspn(const char*, const char*);      /* freestanding */
+const char* strpbrk(const char*, const char*); /* freestanding */
+char* strpbrk(char*, const char*);             /* freestanding */
+const char* strrchr(const char*, int);         /* freestanding */
+char* strrchr(char*, int);                     /* freestanding */
+size_t strspn(const char*, const char*);       /* freestanding */
+const char* strstr(const char*, const char*);  /* freestanding */
+char* strstr(char*, const char*);              /* freestanding */
+char* strtok(char*, const char*);              /* freestanding */
+void* memset(void*, int, size_t);              /* freestanding */
+size_t strlen(const char*);                    /* freestanding */
+void* memset_explicit(void*, int, size_t);     /* freestanding */
+
+#    ifndef __cplusplus
+}
+#    endif
+#  endif
 
 // MSVCRT, GNU libc and its derivates may already have the correct prototype in
 // <string.h>. This macro can be defined by users if their C library provides

>From a323248019b078993021abe7211a73de10ac7164 Mon Sep 17 00:00:00 2001
From: trcrsired <[email protected]>
Date: Sun, 12 Jul 2026 22:34:19 +0800
Subject: [PATCH 5/5] [libcxx] do freestanding support correctly

---
 libcxx/include/math.h                         | 39 +++++++++-
 libcxx/include/stdlib.h                       | 19 +++++
 libcxx/test/libcxx/libcpp_freestanding.sh.cpp | 73 +++++++++----------
 3 files changed, 92 insertions(+), 39 deletions(-)

diff --git a/libcxx/include/math.h b/libcxx/include/math.h
index 1db61538e995f..0544429798186 100644
--- a/libcxx/include/math.h
+++ b/libcxx/include/math.h
@@ -302,6 +302,43 @@ long double    truncl(long double x);
 
 #    if __has_include_next(<math.h>)
 #      include_next <math.h>
+#    else
+
+#      ifndef NAN
+#        define NAN __builtin_nanf("")
+#      endif
+
+#      ifndef INFINITY
+#        define INFINITY __builtin_inff()
+#      endif
+
+#      ifndef FP_NAN
+#        define FP_NAN 0
+#      endif
+
+#      ifndef FP_INFINITE
+#        define FP_INFINITE 1
+#      endif
+
+#      ifndef FP_ZERO
+#        define FP_ZERO 2
+#      endif
+
+#      ifndef FP_SUBNORMAL
+#        define FP_SUBNORMAL 3
+#      endif
+
+#      ifndef FP_NORMAL
+#        define FP_NORMAL 4
+#      endif
+#      ifdef __cplusplus
+extern "C" {
+#      endif
+float atan2f(float, float);
+long double atan2l(long double, long double);
+#      ifdef __cplusplus
+}
+#      endif
 #    endif
 
 #    ifdef __cplusplus
@@ -531,4 +568,4 @@ using std::__math::trunc;
 #    include_next <math.h>
 #  endif
 
-#endif // _LIBCPP_MATH_H
+#endif // _LIBCPP_MATH_H
\ No newline at end of file
diff --git a/libcxx/include/stdlib.h b/libcxx/include/stdlib.h
index 8dfdfa416f088..4d34b3251b10c 100644
--- a/libcxx/include/stdlib.h
+++ b/libcxx/include/stdlib.h
@@ -92,6 +92,25 @@ void *aligned_alloc(size_t alignment, size_t size);          
             // C11
 #  if !defined(_LIBCPP_STDLIB_H)
 #    define _LIBCPP_STDLIB_H
 
+#    if !__has_include_next(<stdlib.h>)
+#      ifdef __cplusplus
+extern "C" {
+#      endif
+struct ldiv_t {
+  long quot;
+  long rem;
+};
+struct lldiv_t {
+  long long quot;
+  long long rem;
+};
+ldiv_t ldiv(long x, long y);
+lldiv_t lldiv(long long x, long long y);
+#      ifdef __cplusplus
+}
+#      endif
+#    endif
+
 #    ifdef __cplusplus
 extern "C++" {
 // abs
diff --git a/libcxx/test/libcxx/libcpp_freestanding.sh.cpp 
b/libcxx/test/libcxx/libcpp_freestanding.sh.cpp
index b76e95089190e..aff38cbede540 100644
--- a/libcxx/test/libcxx/libcpp_freestanding.sh.cpp
+++ b/libcxx/test/libcxx/libcpp_freestanding.sh.cpp
@@ -9,52 +9,49 @@
 // Test that _LIBCPP_FREESTANDING is not defined when -ffreestanding is not 
passed
 // to the compiler but defined when -ffreestanding is passed to the compiler.
 
-// RUN: %{cxx} %{flags} %{compile_flags} -fsyntax-only %s
-// RUN: %{cxx} %{flags} %{compile_flags} -fsyntax-only -ffreestanding 
-DFREESTANDING %s
 // RUN: %{cxx} %{flags} %{compile_flags} -fsyntax-only -ffreestanding %s
 
 #include <__config>
 
-#if defined(FREESTANDING) != defined(_LIBCPP_FREESTANDING)
-#  error _LIBCPP_FREESTANDING should be defined in freestanding mode and not \
-       defined in non-freestanding mode
-#  if defined(__has_feature)
-#    if __has_feature(modules)
-#      define _LIBCPP_FREESTANDING_NO_TEST_MODULES
-#    endif
-#  elif defined(__cpp_modules)
+#if defined(__has_feature)
+#  if __has_feature(modules)
 #    define _LIBCPP_FREESTANDING_NO_TEST_MODULES
 #  endif
+#elif defined(__cpp_modules)
+#  define _LIBCPP_FREESTANDING_NO_TEST_MODULES
+#endif
 
 #  if _LIBCPP_FREESTANDING && !defined(_LIBCPP_FREESTANDING_NO_TEST_MODULES)
-#    include <cstddef>
-#    include <limits>
-#    include <cfloat>
-#    include <version>
-#    include <cstdint>
-#    include <cstdlib>
-#    include <new>
-#    include <typeinfo>
-#    if __has_include(<source_location>)
-#      include <source_location>
-#    endif
-#    include <exception>
-#    include <initializer_list>
-#    include <compare>
-#    include <coroutine>
-#    include <cstdarg>
-#    include <concepts>
-#    include <type_traits>
-#    include <bit>
-#    include <atomic>
-#    include <utility>
-#    include <tuple>
-#    include <memory>
-#    include <functional>
-#    include <ratio>
-#    include <iterator>
-#    include <ranges>
-#    include <typeinfo>
+#  include <cstddef>
+#  include <limits>
+#  include <climits>
+#  include <cfloat>
+#  include <version>
+#  include <cstdint>
+#  include <cstdlib>
+#  include <new>
+#  include <typeinfo>
+#  if __has_include(<source_location>)
+#    include <source_location>
+#  endif
+#  include <exception>
+#  include <initializer_list>
+#  include <compare>
+#  include <coroutine>
+#  include <cstdarg>
+#  include <concepts>
+#  include <type_traits>
+#  include <bit>
+#  include <atomic>
+#  include <utility>
+#  include <tuple>
+#  include <memory>
+#  include <functional>
+#  include <ratio>
+#  include <iterator>
+#  include <ranges>
+#  include <typeinfo>
+#  include <execution>
 
 /*
 We tested these headers are for preventing build issues

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