Move a bunch of tests to directly use the CC1 layer. This at least saves
a subprocess invocation which is pretty significant on Windows. It also
likely saves a bunch of thrashing the host machine needlessly. Finally
it makes the tests much more predictable and less dependent on the host.
For example 'header_lookup1.c' was passing '-fno-ms-extensions' just to
thwart the host detection adding it into the compilation. By runnig CC1
directly we don't have to deal with such oddities.
llvm-svn: 199308
diff --git a/clang/test/Preprocessor/header_lookup1.c b/clang/test/Preprocessor/header_lookup1.c
index d090936..336aba6 100644
--- a/clang/test/Preprocessor/header_lookup1.c
+++ b/clang/test/Preprocessor/header_lookup1.c
@@ -1,2 +1,2 @@
-// RUN: %clang -fno-ms-extensions %s -E | grep 'stddef.h.*3'
+// RUN: %clang_cc1 %s -E | grep 'stddef.h.*3'
#include <stddef.h>