Fix PR 11709: Change the definition of va_list to meet AAPCS requirement

AAPCS ABI Section 7.1.4 [1] specifies that va_list
should be defined as struct __va_list { void *__ap;};
And in C++, it is defined in namespace std.

[1] http://infocenter.arm.com/help/topic
         /com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf

Patch by Weiming Zhao.

llvm-svn: 165609

1 files changed, 19 insertions, 1 deletions

diff --git a/clang/test/Sema/builtins-arm.c b/clang/test/Sema/builtins-arm.c
index 4077240ce49..7b48af155ee 100644
--- a/clang/test/Sema/builtins-arm.c
+++ b/clang/test/Sema/builtins-arm.c
@@ -1,5 +1,7 @@
 // RUN: %clang_cc1 -triple armv7 -fsyntax-only -verify -DTEST0 %s
 // RUN: %clang_cc1 -triple armv7 -fsyntax-only -verify -DTEST1 %s
+// RUN: %clang_cc1 -triple armv7 -target-abi apcs-gnu \
+// RUN:   -fsyntax-only -verify -DTEST1 %s
 
 #ifdef TEST0
 void __clear_cache(char*, char*);
@@ -9,8 +11,24 @@ void __clear_cache(char*, char*);
 void __clear_cache(void*, void*);
 #endif
 
-// va_list on ARM is void*.
+#if defined(__ARM_PCS) || defined(__ARM_EABI__)
+// va_list on ARM AAPCS is struct { void* __ap }.
+void test1() {
+  __builtin_va_list ptr;
+  ptr.__ap = "x";
+  *(ptr.__ap) = '0'; // expected-error {{incomplete type 'void' is not assignable}}
+}
+#else
+// va_list on ARM apcs-gnu is void*.
+void test1() {
+  __builtin_va_list ptr;
+  ptr.__ap = "x";  // expected-error {{member reference base type '__builtin_va_list' is not a structure or union}}
+  *(ptr.__ap) = '0';// expected-error {{member reference base type '__builtin_va_list' is not a structure or union}}
+}
+
 void test2() {
   __builtin_va_list ptr = "x";
   *ptr = '0'; // expected-error {{incomplete type 'void' is not assignable}}
 }
+
+#endif