[frontend] Initialize the diagnostic client before loading an ast file.
Issue reported by Tom Honermann!
http://llvm.org/bugs/show_bug.cgi?id=15377
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177336 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Frontend/ast-main.cpp b/test/Frontend/ast-main.cpp
new file mode 100644
index 0000000..d3d8471
--- /dev/null
+++ b/test/Frontend/ast-main.cpp
@@ -0,0 +1,22 @@
+// RUN: %clang -emit-llvm -S -o %t1.ll -x c++ - < %s
+// RUN: %clang -emit-ast -o %t.ast %s
+// RUN: %clang -emit-llvm -S -o %t2.ll -x ast - < %t.ast
+// RUN: diff %t1.ll %t2.ll
+
+// http://llvm.org/bugs/show_bug.cgi?id=15377
+template<typename T>
+struct S {
+ T *mf();
+};
+template<typename T>
+T *S<T>::mf() {
+ // warning: control reaches end of non-void function [-Wreturn-type]
+}
+
+void f() {
+ S<int>().mf();
+}
+
+int main() {
+ return 0;
+}