Darwin: Define __STDC_NO_THREADS__ on Darwin targets

Darwin doesn't support C11 threads.h.  Define `__STDC_NO_THREADS__` so
that users can check for it.

rdar://problem/18461003

llvm-svn: 301508

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index d7f1793..78b03b1 100644 (file)
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -117,6 +117,7 @@ static void getDarwinDefines(MacroBuilder &Builder, const LangOptions &Opts,
                              VersionTuple &PlatformMinVersion) {
   Builder.defineMacro("__APPLE_CC__", "6000");
   Builder.defineMacro("__APPLE__");
+  Builder.defineMacro("__STDC_NO_THREADS__");
   Builder.defineMacro("OBJC_NEW_PROPERTIES");
   // AddressSanitizer doesn't play well with source fortification, which is on
   // by default on Darwin.

diff --git a/clang/test/Preprocessor/init.c b/clang/test/Preprocessor/init.c
index 5fb2011..36ef9b2 100644 (file)
--- a/clang/test/Preprocessor/init.c
+++ b/clang/test/Preprocessor/init.c
@@ -9690,3 +9690,12 @@
 // MSVC-X64-NEXT:#define __CLANG_ATOMIC_SHORT_LOCK_FREE 2
 // MSVC-X64-NEXT:#define __CLANG_ATOMIC_WCHAR_T_LOCK_FREE 2
 // MSVC-X86-NOT:#define __GCC_ATOMIC{{.*}}
+
+// RUN: %clang_cc1 -E -dM -ffreestanding                \
+// RUN:   -triple=aarch64-apple-ios9 < /dev/null        \
+// RUN: | FileCheck -check-prefix=DARWIN %s
+// RUN: %clang_cc1 -E -dM -ffreestanding                \
+// RUN:   -triple=aarch64-apple-macosx10.12 < /dev/null \
+// RUN: | FileCheck -check-prefix=DARWIN %s
+
+// DARWIN:#define __STDC_NO_THREADS__ 1