-fms-extensions: Add __va_start builtin, which is used for x64
The main difference between __va_start and __builtin_va_start is that
the address of the va_list has already been taken, and the va_list is
always a char*.
__va_end and __va_arg are not needed.
llvm-svn: 204821
diff --git a/clang/test/Sema/MicrosoftExtensions.c b/clang/test/Sema/MicrosoftExtensions.c
index 4441f17..a4afcb1 100644
--- a/clang/test/Sema/MicrosoftExtensions.c
+++ b/clang/test/Sema/MicrosoftExtensions.c
@@ -131,3 +131,17 @@
typedef int *T;
T __ptr32 wrong10; // expected-error {{'__ptr32' attribute only applies to pointer arguments}}
+
+typedef char *my_va_list;
+void __cdecl __va_start(my_va_list *ap, ...); // expected-note {{passing argument to parameter 'ap' here}}
+void vmyprintf(const char *f, my_va_list ap);
+void myprintf(const char *f, ...) {
+ my_va_list ap;
+ if (1) {
+ __va_start(&ap, f);
+ vmyprintf(f, ap);
+ ap = 0;
+ } else {
+ __va_start(ap, f); // expected-warning {{incompatible pointer types passing 'my_va_list'}}
+ }
+}