diff options
Diffstat (limited to 'clang/lib/Driver/ToolChains/Linux.cpp')
| -rw-r--r-- | clang/lib/Driver/ToolChains/Linux.cpp | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp index 1301cdf114a..5c3697391d5 100644 --- a/clang/lib/Driver/ToolChains/Linux.cpp +++ b/clang/lib/Driver/ToolChains/Linux.cpp @@ -710,6 +710,8 @@ void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include"); addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include"); + + AddGnuIncludeArgs(DriverArgs, CC1Args); } static std::string DetectLibcxxIncludePath(StringRef base) { @@ -748,6 +750,16 @@ std::string Linux::findLibCxxIncludePath() const { return ""; } +void Linux::AddGnuIncludeArgs(const llvm::opt::ArgList &DriverArgs, + llvm::opt::ArgStringList &CC1Args) const { + if (!DriverArgs.hasArg(options::OPT_ffreestanding)) { + // For gcc compatibility, clang will preinclude <stdc-predef.h> + // -ffreestanding suppresses this behavior. + CC1Args.push_back("-fsystem-include-if-exists"); + CC1Args.push_back("stdc-predef.h"); + } +} + void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args) const { // We need a detected GCC installation on Linux to provide libstdc++'s |
