Make precompiled headers work with -E. When we're only preprocessing

(with -E), we turn the PCH include into an implicit include of the
file from which the PCH file was generated.

llvm-svn: 71534

2 files changed, 12 insertions, 0 deletions

diff --git a/clang/test/PCH/preprocess.c b/clang/test/PCH/preprocess.c
new file mode 100644
index 00000000000..128cc0acb97
--- /dev/null
+++ b/clang/test/PCH/preprocess.c
@@ -0,0 +1,5 @@
+// RUN: clang-cc -emit-pch -o %t %S/preprocess.h &&
+// RUN: clang-cc -include-pch %t -E -o - %s | grep -c "a_typedef" | count 1
+#include "preprocess.h"
+
+int a_value;
diff --git a/clang/test/PCH/preprocess.h b/clang/test/PCH/preprocess.h
new file mode 100644
index 00000000000..39fa006181f
--- /dev/null
+++ b/clang/test/PCH/preprocess.h
@@ -0,0 +1,7 @@
+// Helper header for preprocess.c PCH test
+#ifndef PREPROCESS_H
+#define PREPROCESS_H
+
+typedef int a_typedef;
+
+#endif // PREPROCESS_H