From 2b003fd2766914133fa7418e1b368ca171ac4205 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 21 Apr 2010 05:52:38 +0000
Subject: [PATCH] Sink the _GNU_SOURCE definition down into the target
 configuration, and only define it where we know we need it---Linux and
 Cygwin. Thanks to Chris for the prodding.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@101989 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Basic/Targets.cpp             |  4 ++++
 lib/Frontend/InitPreprocessor.cpp | 24 ------------------------
 2 files changed, 4 insertions(+), 24 deletions(-)

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 1b80527aca..b94f55bdfd 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -219,6 +219,8 @@ protected:
     Builder.defineMacro("__ELF__");
     if (Opts.POSIXThreads)
       Builder.defineMacro("_REENTRANT");
+    if (Opts.CPlusPlus)
+      Builder.defineMacro("_GNU_SOURCE");
   }
 public:
   LinuxTargetInfo(const std::string& triple)
@@ -1221,6 +1223,8 @@ public:
     Builder.defineMacro("__CYGWIN__");
     Builder.defineMacro("__CYGWIN32__");
     DefineStd(Builder, "unix", Opts);
+    if (Opts.CPlusPlus)
+      Builder.defineMacro("_GNU_SOURCE");
   }
 };
 } // end anonymous namespace
diff --git a/lib/Frontend/InitPreprocessor.cpp b/lib/Frontend/InitPreprocessor.cpp
index aacae49540..ea0f8c0877 100644
--- a/lib/Frontend/InitPreprocessor.cpp
+++ b/lib/Frontend/InitPreprocessor.cpp
@@ -294,30 +294,6 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
       //   C++ translation unit.
       Builder.defineMacro("__cplusplus", "199711L");
     Builder.defineMacro("__private_extern__", "extern");
-
-    // Define _GNU_SOURCE on platforms where we expect to use glibc.
-    switch (TI.getTriple().getOS()) {
-    case llvm::Triple::Cygwin:
-    case llvm::Triple::MinGW64:
-    case llvm::Triple::MinGW32:
-    case llvm::Triple::Linux:
-    case llvm::Triple::Solaris:
-    case llvm::Triple::AuroraUX:
-      Builder.defineMacro("_GNU_SOURCE");
-      break;
-
-    case llvm::Triple::Darwin:
-    case llvm::Triple::DragonFly:
-    case llvm::Triple::FreeBSD:
-    case llvm::Triple::UnknownOS:
-    case llvm::Triple::Lv2:
-    case llvm::Triple::NetBSD:
-    case llvm::Triple::OpenBSD:
-    case llvm::Triple::Psp:
-    case llvm::Triple::Win32:
-    case llvm::Triple::Haiku:
-      break;
-    }
   }
 
   if (LangOpts.Microsoft) {
-- 
2.40.0