Handle corner case where clang-cc is invoked directly to compile preprocessed source file without -main-file-name. In this case, CDDebugInfo is not able identify correct main source file becase SM.isFromMainFile() returns true for locations from header files as well as locations from main source file.
This patch takes conservative approach by not emitting more then one compile unit with isMain bit set.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69902 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/2009-04-23-dbg.c b/test/CodeGen/2009-04-23-dbg.c
new file mode 100644
index 0000000..4be6dab
--- /dev/null
+++ b/test/CodeGen/2009-04-23-dbg.c
@@ -0,0 +1,20 @@
+// RUN: clang-cc -g -o %t %s -emit-llvm-bc && llc %t -f -o %t.s
+# 1 "a.c"
+# 1 "a.c" 1
+# 1 "<built-in>" 1
+# 103 "<built-in>"
+# 103 "<command line>" 1
+
+# 1 "/private/tmp/a.h" 1
+int bar;
+# 105 "<command line>" 2
+# 105 "<built-in>" 2
+# 1 "a.c" 2
+# 1 "/private/tmp/a.h" 1
+int bar;
+# 2 "a.c" 2
+
+int main() {
+ bar = 0;
+ return 0;
+}