llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-clang-driver Author: Carlo Cabrera (carlocab) <details> <summary>Changes</summary> This is a scaled down version of https://reviews.llvm.org/D136315. The intent is largely the same as before[^1], but I've scaled down the scope to try to avoid the issues that the previous patch caused: - the changes are now opt-in based on enabling `CLANG_USE_XCSELECT` - this only works when targeting macOS on a macOS host (this is the only case supported by `libxcselect`[^2]) We also introduce an environment variable `CLANG_NO_XCSELECT` that disables this behaviour if Clang is configured with `CLANG_USE_XCSELECT=ON`. This is needed to avoid breaking tests. Another reason to leave this as opt-in for now is that there are some bugs in libxcselect that need fixing before it is safe to use by default for all users. This has been reported to Apple as FB16081077. [^1]: See also https://reviews.llvm.org/D109460 and #<!-- -->45225. [^2]: https://developer.apple.com/documentation/xcselect?language=objc --- Full diff: https://github.com/llvm/llvm-project/pull/119670.diff 5 Files Affected: - (modified) clang/CMakeLists.txt (+33) - (modified) clang/include/clang/Config/config.h.cmake (+6) - (modified) clang/lib/Driver/CMakeLists.txt (+4) - (modified) clang/lib/Driver/ToolChains/Darwin.cpp (+22-9) - (modified) clang/test/lit.cfg.py (+4) ``````````diff diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt index 27e8095534a65c..3c7096a27c509b 100644 --- a/clang/CMakeLists.txt +++ b/clang/CMakeLists.txt @@ -214,6 +214,39 @@ if(GCC_INSTALL_PREFIX AND NOT USE_DEPRECATED_GCC_INSTALL_PREFIX) "See https://github.com/llvm/llvm-project/pull/77537 for detail.") endif() +if(APPLE) + check_include_file(xcselect.h CLANG_HAVE_XCSELECT_H) + if(CLANG_HAVE_XCSELECT_H) + include(CheckSymbolExists) + list(APPEND CMAKE_REQUIRED_LIBRARIES xcselect) + check_symbol_exists(xcselect_host_sdk_path xcselect.h CLANG_HAVE_XCSELECT_HOST_SDK_PATH) + list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES xcselect) + endif() +endif() + +cmake_dependent_option(CLANG_USE_XCSELECT "Use libxcselect to find the macOS SDK." OFF + "APPLE;CLANG_HAVE_XCSELECT_HOST_SDK_PATH" OFF) + +if(DEFAULT_SYSROOT AND CLANG_USE_XCSELECT) + message(FATAL_ERROR "Setting DEFAULT_SYSROOT is incompatible with CLANG_USE_XCSELECT.") +endif() + +if(CLANG_USE_XCSELECT) + set(XCSELECT_VALID_POLICIES LATEST MATCHING_ONLY MATCHING_PREFERRED) + set(CLANG_XCSELECT_HOST_SDK_POLICY "LATEST" CACHE STRING + "Policy to use for xcselect. One of: ${XCSELECT_VALID_POLICIES}") + set_property(CACHE CLANG_XCSELECT_HOST_SDK_POLICY PROPERTY STRINGS ${XCSELECT_VALID_POLICIES}) + string(TOUPPER ${CLANG_XCSELECT_HOST_SDK_POLICY} CLANG_XCSELECT_HOST_SDK_POLICY) + list(JOIN XCSELECT_VALID_POLICIES "|" XCSELECT_POLICY_REGEX) + if(NOT CLANG_XCSELECT_HOST_SDK_POLICY MATCHES "^XCSELECT_HOST_SDK_POLICY_(${XCSELECT_POLICY_REGEX})$") + if(NOT CLANG_XCSELECT_HOST_SDK_POLICY IN_LIST XCSELECT_VALID_POLICIES) + message(FATAL_ERROR + "CLANG_XCSELECT_HOST_SDK_POLICY (${CLANG_XCSELECT_HOST_SDK_POLICY}) must be one of: ${XCSELECT_VALID_POLICIES}") + endif() + set(CLANG_XCSELECT_HOST_SDK_POLICY "XCSELECT_HOST_SDK_POLICY_${CLANG_XCSELECT_HOST_SDK_POLICY}") + endif() +endif() + set(ENABLE_LINKER_BUILD_ID OFF CACHE BOOL "pass --build-id to ld") set(ENABLE_X86_RELAX_RELOCATIONS ON CACHE BOOL diff --git a/clang/include/clang/Config/config.h.cmake b/clang/include/clang/Config/config.h.cmake index 27ed69e21562bf..9ae0c6a4b9e11d 100644 --- a/clang/include/clang/Config/config.h.cmake +++ b/clang/include/clang/Config/config.h.cmake @@ -86,4 +86,10 @@ /* Whether CIR is built into Clang */ #cmakedefine01 CLANG_ENABLE_CIR +/* Whether to use xcselect to find the macOS SDK */ +#cmakedefine CLANG_USE_XCSELECT + +/* Policy to use for xcselect */ +#cmakedefine CLANG_XCSELECT_HOST_SDK_POLICY ${CLANG_XCSELECT_HOST_SDK_POLICY} + #endif diff --git a/clang/lib/Driver/CMakeLists.txt b/clang/lib/Driver/CMakeLists.txt index 4fd10bf671512f..299de2ef30470c 100644 --- a/clang/lib/Driver/CMakeLists.txt +++ b/clang/lib/Driver/CMakeLists.txt @@ -14,6 +14,10 @@ if(WIN32) set(system_libs version) endif() +if(CLANG_USE_XCSELECT) + set(system_libs xcselect) +endif() + add_clang_library(clangDriver Action.cpp Compilation.cpp diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp index 87380869f6fdab..8d3e0130a5a432 100644 --- a/clang/lib/Driver/ToolChains/Darwin.cpp +++ b/clang/lib/Driver/ToolChains/Darwin.cpp @@ -29,6 +29,10 @@ #include "llvm/TargetParser/Triple.h" #include <cstdlib> // ::getenv +#ifdef CLANG_USE_XCSELECT +#include <xcselect.h> // ::xcselect_host_sdk_path +#endif + using namespace clang::driver; using namespace clang::driver::tools; using namespace clang::driver::toolchains; @@ -2257,17 +2261,26 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const { // Warn if the path does not exist. if (!getVFS().exists(A->getValue())) getDriver().Diag(clang::diag::warn_missing_sysroot) << A->getValue(); - } else { - if (char *env = ::getenv("SDKROOT")) { - // We only use this value as the default if it is an absolute path, - // exists, and it is not the root path. - if (llvm::sys::path::is_absolute(env) && getVFS().exists(env) && - StringRef(env) != "/") { - Args.append(Args.MakeSeparateArg( - nullptr, Opts.getOption(options::OPT_isysroot), env)); - } + } else if (const char *env = ::getenv("SDKROOT"); env && *env) { + // We only use this value as the default if it is an absolute path, + // exists, and it is not the root path. + if (llvm::sys::path::is_absolute(env) && getVFS().exists(env) && + StringRef(env) != "/") { + Args.append(Args.MakeSeparateArg( + nullptr, Opts.getOption(options::OPT_isysroot), env)); } } +#ifdef CLANG_USE_XCSELECT + else if (const char *env = ::getenv("CLANG_NO_XCSELECT"); + getTriple().isMacOSX() && (!env || !*env)) { + if (char *p; + !::xcselect_host_sdk_path(CLANG_XCSELECT_HOST_SDK_POLICY, &p)) { + Args.append(Args.MakeSeparateArg( + nullptr, Opts.getOption(options::OPT_isysroot), p)); + ::free(p); + } + } +#endif // Read the SDKSettings.json file for more information, like the SDK version // that we can pass down to the compiler. diff --git a/clang/test/lit.cfg.py b/clang/test/lit.cfg.py index 7e7934d5fe0f5f..d05ad1ec6c5fa6 100644 --- a/clang/test/lit.cfg.py +++ b/clang/test/lit.cfg.py @@ -366,3 +366,7 @@ def calculate_arch_features(arch_string): # possibly be present in system and user configuration files, so disable # default configs for the test runs. config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1" + +# Configuring clang with CLANG_USE_XCSELECT=ON breaks some tests, so disable +# its behaviour while running tests. +config.environment["CLANG_NO_XCSELECT"] = "1" `````````` </details> https://github.com/llvm/llvm-project/pull/119670 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits