Merging r292119:

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r292119 | joerg | 2017-01-16 15:07:24 +0100 (Mo, 16. Jan 2017) | 3 Zeilen

Ensure that clang -pthread creates the right macro. -D_POSIX_THREADS
seems to have been a C&P error from old GCC specs for OpenBSD.

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_40@292451 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Basic/Targets.cpp

@@ -512,7 +512,7 @@ protected:
     Builder.defineMacro("__unix__");
     Builder.defineMacro("__ELF__");
     if (Opts.POSIXThreads)
-      Builder.defineMacro("_POSIX_THREADS");
+      Builder.defineMacro("_REENTRANT");
 
     switch (Triple.getArch()) {
     default:

test/Driver/netbsd.c

@@ -126,6 +126,8 @@
 // RUN: %clang -no-canonical-prefixes -target powerpc64--netbsd -static \
 // RUN: --sysroot=%S/Inputs/basic_netbsd_tree %s -### 2>&1 \
 // RUN: | FileCheck -check-prefix=S-POWERPC64 %s
+// RUN: %clang -target x86_64--netbsd -pthread -dM -E %s \
+// RUN: | FileCheck -check-prefix=PTHREAD %s
 
 // STATIC: ld{{.*}}" "--eh-frame-hdr"
 // STATIC-NOT: "-pie"
@@ -427,3 +429,7 @@
 // S-POWERPC64: "{{.*}}/usr/lib{{/|\\\\}}crti.o"
 // S-POWERPC64: "{{.*}}/usr/lib{{/|\\\\}}crtbegin.o" "{{.*}}.o" "-lc"
 // S-POWERPC64: "{{.*}}/usr/lib{{/|\\\\}}crtend.o" "{{.*}}/usr/lib{{/|\\\\}}crtn.o"
+
+// PTHREAD-NOT: _POSIX_THREADS
+// PTHREAD:     _REENTRANT
+// PTHREAD-NOT: _POSIX_THREADS