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

2 files changed, 4 insertions, 1 deletions

diff --git a/clang/unittests/Tooling/TestVisitor.h b/clang/unittests/Tooling/TestVisitor.h
index fb6a76ccadd..e7e57d184ed 100644
--- a/clang/unittests/Tooling/TestVisitor.h
+++ b/clang/unittests/Tooling/TestVisitor.h
@@ -52,6 +52,7 @@ public:
   /// \brief Runs the current AST visitor over the given code.
   bool runOver(StringRef Code, Language L = Lang_CXX) {
     std::vector<std::string> Args;
+    Args.push_back("-ffreestanding");
     switch (L) {
       case Lang_C:
         Args.push_back("-x");
diff --git a/clang/unittests/libclang/LibclangTest.cpp b/clang/unittests/libclang/LibclangTest.cpp
index f2a96d6be6c..98c2ad16a33 100644
--- a/clang/unittests/libclang/LibclangTest.cpp
+++ b/clang/unittests/libclang/LibclangTest.cpp
@@ -434,8 +434,10 @@ TEST_F(LibclangParseTest, AllSkippedRanges) {
     "#ifdef KIWIS\n"
     "printf(\"mmm!!\");\n"
     "#endif");
+  const char *Args[] = { "-ffreestanding" };
+  int NumArgs = sizeof(Args) / sizeof(Args[0]);
 
-  ClangTU = clang_parseTranslationUnit(Index, Main.c_str(), nullptr, 0,
+  ClangTU = clang_parseTranslationUnit(Index, Main.c_str(), Args, NumArgs,
                                        nullptr, 0, TUFlags);
 
   CXSourceRangeList *Ranges = clang_getAllSkippedRanges(ClangTU);