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-rw-r--r--clang/lib/Basic/Targets/OSTargets.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/clang/lib/Basic/Targets/OSTargets.h b/clang/lib/Basic/Targets/OSTargets.h
index 519a35b06f9..ca84a875de1 100644
--- a/clang/lib/Basic/Targets/OSTargets.h
+++ b/clang/lib/Basic/Targets/OSTargets.h
@@ -505,6 +505,8 @@ protected:
Builder.defineMacro("__rtems__");
Builder.defineMacro("__ELF__");
+ if (Opts.CPlusPlus)
+ Builder.defineMacro("_GNU_SOURCE");
}
public:
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