For Linux/gnu compatibility, preinclude <stdc-predef.h> if the file is available

As reported in llvm bugzilla 32377.
Here’s a patch to add preinclude of stdc-predef.h.

The gcc documentation says “On GNU/Linux, <stdc-predef.h> is pre-included.” See https://gcc.gnu.org/gcc-4.8/porting_to.html;

The preinclude is inhibited with –ffreestanding.

Basically I fixed the failing test cases by adding –ffreestanding which inhibits this behavior.

I fixed all the failing tests, including some in extra/test, there's a separate patch for that which is linked here

Note: this is a recommit after a test failure took down the original (r318669)

Patch By: mibintc
Differential Revision: https://reviews.llvm.org/D34158

llvm-svn: 320391

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/test/Driver/Inputs/stdc-predef/usr/include/stdc-predef.h b/clang/test/Driver/Inputs/stdc-predef/usr/include/stdc-predef.h
new file mode 100644
index 00000000000..ddf0103beca
--- /dev/null
+++ b/clang/test/Driver/Inputs/stdc-predef/usr/include/stdc-predef.h
@@ -0,0 +1,12 @@
+#ifndef	_STDC_PREDEF_H
+#define	_STDC_PREDEF_H	1
+
+#define DUMMY_STDC_PREDEF 1
+
+#endif
+#ifndef	_STDC_PREDEF_H
+#define	_STDC_PREDEF_H	1
+
+#define DUMMY_STDC_PREDEF 1
+
+#endif