Author: Nick Desaulniers Date: 2020-03-02T09:39:26-08:00 New Revision: 91cdbd521a38495c66e30636943563ca70d3c022
URL: https://github.com/llvm/llvm-project/commit/91cdbd521a38495c66e30636943563ca70d3c022 DIFF: https://github.com/llvm/llvm-project/commit/91cdbd521a38495c66e30636943563ca70d3c022.diff LOG: clang: Switch C compilations to C17 by default. Summary: Matches GCC 8.1 (2018). Updates documentation+release notes as well. See also https://reviews.llvm.org/rL220244. Reviewers: rsmith, aaron.ballman Reviewed By: rsmith, aaron.ballman Subscribers: aaron.ballman, dschuff, aheejin, simoncook, s.egerton, cfe-commits, hans, srhines Tags: #clang Differential Revision: https://reviews.llvm.org/D75383 Added: Modified: clang/docs/ReleaseNotes.rst clang/docs/UsersManual.rst clang/lib/Frontend/CompilerInvocation.cpp clang/test/Preprocessor/init-aarch64.c clang/test/Preprocessor/init.c clang/www/compatibility.html Removed: ################################################################################ diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 831ef32c6b8a..ce121ebe6055 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -101,12 +101,10 @@ Windows Support C Language Changes in Clang --------------------------- -- ... - -C11 Feature Support -^^^^^^^^^^^^^^^^^^^ +- The default C language standard used when `-std=` is not specified has been + upgraded from gnu11 to gnu17. -... +- ... C++ Language Changes in Clang ----------------------------- diff --git a/clang/docs/UsersManual.rst b/clang/docs/UsersManual.rst index 856d5e34bbcc..f50f8888f477 100644 --- a/clang/docs/UsersManual.rst +++ b/clang/docs/UsersManual.rst @@ -80,7 +80,7 @@ Basic Usage Intro to how to use a C compiler for newbies. compile + link compile then link debug info enabling optimizations -picking a language to use, defaults to C11 by default. Autosenses based +picking a language to use, defaults to C17 by default. Autosenses based on extension. using a makefile Command Line Options @@ -2399,10 +2399,10 @@ See :doc:`LanguageExtensions`. Differences between various standard modes ------------------------------------------ -clang supports the -std option, which changes what language mode clang -uses. The supported modes for C are c89, gnu89, c99, gnu99, c11, gnu11, -c17, gnu17, and various aliases for those modes. If no -std option is -specified, clang defaults to gnu11 mode. Many C99 and C11 features are +clang supports the -std option, which changes what language mode clang uses. +The supported modes for C are c89, gnu89, c99, gnu99, c11, gnu11, c17, gnu17, +c2x, gnu2x, and various aliases for those modes. If no -std option is +specified, clang defaults to gnu17 mode. Many C99 and C11 features are supported in earlier modes as a conforming extension, with a warning. Use ``-pedantic-errors`` to request an error if a feature from a later standard revision is used in an earlier mode. diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp index 9cc41c9d96f8..8638d4300b21 100644 --- a/clang/lib/Frontend/CompilerInvocation.cpp +++ b/clang/lib/Frontend/CompilerInvocation.cpp @@ -2263,7 +2263,7 @@ void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK, if (T.isPS4()) LangStd = LangStandard::lang_gnu99; else - LangStd = LangStandard::lang_gnu11; + LangStd = LangStandard::lang_gnu17; #endif break; case Language::ObjC: diff --git a/clang/test/Preprocessor/init-aarch64.c b/clang/test/Preprocessor/init-aarch64.c index 380e5e2d7261..df2a6128989b 100644 --- a/clang/test/Preprocessor/init-aarch64.c +++ b/clang/test/Preprocessor/init-aarch64.c @@ -236,7 +236,7 @@ // AARCH64-NEXT: #define __STDC_HOSTED__ 1 // AARCH64-NEXT: #define __STDC_UTF_16__ 1 // AARCH64-NEXT: #define __STDC_UTF_32__ 1 -// AARCH64_C: #define __STDC_VERSION__ 201112L +// AARCH64_C: #define __STDC_VERSION__ 201710L // AARCH64-NEXT: #define __STDC__ 1 // AARCH64-NEXT: #define __UINT16_C_SUFFIX__ // AARCH64-NEXT: #define __UINT16_FMTX__ "hX" @@ -646,7 +646,7 @@ // AARCH64-MSVC: #define __STDC_HOSTED__ 0 // AARCH64-MSVC: #define __STDC_UTF_16__ 1 // AARCH64-MSVC: #define __STDC_UTF_32__ 1 -// AARCH64-MSVC: #define __STDC_VERSION__ 201112L +// AARCH64-MSVC: #define __STDC_VERSION__ 201710L // AARCH64-MSVC: #define __STDC__ 1 // AARCH64-MSVC: #define __UINT16_C_SUFFIX__ // AARCH64-MSVC: #define __UINT16_MAX__ 65535 diff --git a/clang/test/Preprocessor/init.c b/clang/test/Preprocessor/init.c index f38f87ddef8e..e987a3b3b93d 100644 --- a/clang/test/Preprocessor/init.c +++ b/clang/test/Preprocessor/init.c @@ -117,7 +117,7 @@ // RUN: %clang_cc1 -E -dM -triple=x86_64-apple-darwin < /dev/null | FileCheck -match-full-lines -check-prefix C-DEFAULT %s // RUN: %clang_cc1 -E -dM -triple=armv7a-apple-darwin < /dev/null | FileCheck -match-full-lines -check-prefix C-DEFAULT %s // -// C-DEFAULT:#define __STDC_VERSION__ 201112L +// C-DEFAULT:#define __STDC_VERSION__ 201710L // // RUN: %clang_cc1 -ffreestanding -E -dM < /dev/null | FileCheck -match-full-lines -check-prefix FREESTANDING %s // FREESTANDING:#define __STDC_HOSTED__ 0 @@ -2098,7 +2098,7 @@ // MIPS32BE:#define __SIZE_WIDTH__ 32 // MIPS32BE-CXX:#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 8U // MIPS32BE:#define __STDC_HOSTED__ 0 -// MIPS32BE-C:#define __STDC_VERSION__ 201112L +// MIPS32BE-C:#define __STDC_VERSION__ 201710L // MIPS32BE:#define __STDC__ 1 // MIPS32BE:#define __UINT16_C_SUFFIX__ // MIPS32BE:#define __UINT16_MAX__ 65535 @@ -2557,7 +2557,7 @@ // MIPSN32BE: #define __STDC_HOSTED__ 0 // MIPSN32BE: #define __STDC_UTF_16__ 1 // MIPSN32BE: #define __STDC_UTF_32__ 1 -// MIPSN32BE-C: #define __STDC_VERSION__ 201112L +// MIPSN32BE-C: #define __STDC_VERSION__ 201710L // MIPSN32BE: #define __STDC__ 1 // MIPSN32BE: #define __UINT16_C_SUFFIX__ // MIPSN32BE: #define __UINT16_FMTX__ "hX" @@ -2864,7 +2864,7 @@ // MIPSN32EL: #define __STDC_HOSTED__ 0 // MIPSN32EL: #define __STDC_UTF_16__ 1 // MIPSN32EL: #define __STDC_UTF_32__ 1 -// MIPSN32EL: #define __STDC_VERSION__ 201112L +// MIPSN32EL: #define __STDC_VERSION__ 201710L // MIPSN32EL: #define __STDC__ 1 // MIPSN32EL: #define __UINT16_C_SUFFIX__ // MIPSN32EL: #define __UINT16_FMTX__ "hX" @@ -5390,7 +5390,7 @@ // PPC-DARWIN:#define __SIZE_TYPE__ long unsigned int // PPC-DARWIN:#define __SIZE_WIDTH__ 32 // PPC-DARWIN:#define __STDC_HOSTED__ 0 -// PPC-DARWIN:#define __STDC_VERSION__ 201112L +// PPC-DARWIN:#define __STDC_VERSION__ 201710L // PPC-DARWIN:#define __STDC__ 1 // PPC-DARWIN:#define __UINT16_C_SUFFIX__ // PPC-DARWIN:#define __UINT16_MAX__ 65535 @@ -6602,7 +6602,7 @@ // X86_64-CLOUDABI:#define __STDC_ISO_10646__ 201206L // X86_64-CLOUDABI:#define __STDC_UTF_16__ 1 // X86_64-CLOUDABI:#define __STDC_UTF_32__ 1 -// X86_64-CLOUDABI:#define __STDC_VERSION__ 201112L +// X86_64-CLOUDABI:#define __STDC_VERSION__ 201710L // X86_64-CLOUDABI:#define __STDC__ 1 // X86_64-CLOUDABI:#define __UINT16_C_SUFFIX__ // X86_64-CLOUDABI:#define __UINT16_FMTX__ "hX" @@ -7601,7 +7601,7 @@ // WEBASSEMBLY-NOT:#define __STDC_NO_THREADS__ // WEBASSEMBLY-NEXT:#define __STDC_UTF_16__ 1 // WEBASSEMBLY-NEXT:#define __STDC_UTF_32__ 1 -// WEBASSEMBLY-NEXT:#define __STDC_VERSION__ 201112L +// WEBASSEMBLY-NEXT:#define __STDC_VERSION__ 201710L // WEBASSEMBLY-NEXT:#define __STDC__ 1 // WEBASSEMBLY-NEXT:#define __UINT16_C_SUFFIX__ // WEBASSEMBLY-NEXT:#define __UINT16_FMTX__ "hX" @@ -8166,7 +8166,7 @@ // RISCV32: #define __STDC_HOSTED__ 0 // RISCV32: #define __STDC_UTF_16__ 1 // RISCV32: #define __STDC_UTF_32__ 1 -// RISCV32: #define __STDC_VERSION__ 201112L +// RISCV32: #define __STDC_VERSION__ 201710L // RISCV32: #define __STDC__ 1 // RISCV32: #define __UINT16_C_SUFFIX__ // RISCV32: #define __UINT16_MAX__ 65535 @@ -8373,7 +8373,7 @@ // RISCV64: #define __STDC_HOSTED__ 0 // RISCV64: #define __STDC_UTF_16__ 1 // RISCV64: #define __STDC_UTF_32__ 1 -// RISCV64: #define __STDC_VERSION__ 201112L +// RISCV64: #define __STDC_VERSION__ 201710L // RISCV64: #define __STDC__ 1 // RISCV64: #define __UINT16_C_SUFFIX__ // RISCV64: #define __UINT16_MAX__ 65535 diff --git a/clang/www/compatibility.html b/clang/www/compatibility.html index 9f8ee4bdc012..a593155951da 100755 --- a/clang/www/compatibility.html +++ b/clang/www/compatibility.html @@ -83,7 +83,7 @@ <h2 id="c">C compatibility</h2> <!-- ======================================================================= --> <h3 id="inline">C99 inline functions</h3> <!-- ======================================================================= --> -<p>By default, Clang builds C code in GNU C11 mode, so it uses standard C99 +<p>By default, Clang builds C code in GNU C17 mode, so it uses standard C99 semantics for the <code>inline</code> keyword. These semantics are diff erent from those in GNU C89 mode, which is the default mode in versions of GCC prior to 5.0. For example, consider the following code:</p> _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
