[PATCH][AARCH64] Fix the name mangling of va_list

[Yufeng Zhang <Yufeng dot Zhang at arm dot com>]

Hi,

This patch updates the AArch64 port to mangle __va_list as it is in
namespace std in C++.  This is specified in the AArch64 AAPCS64 ABI doc.

OK for the trunk?

Thanks,
Yufeng

gcc/ChangeLog

2012-11-21  Yufeng Zhang  <yufeng.zhang@arm.com>

        * config/aarch64/aarch64.c (aarch64_mangle_type): New function.
        (TARGET_MANGLE_TYPE): Define.

gcc/testsuite/ChangeLog

2012-11-21  Yufeng Zhang  <yufeng.zhang@arm.com>

        * g++.dg/abi/arm_va_list.C: Also test on aarch64*-*-*.
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 4437fef..792b086 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -5859,6 +5859,20 @@ aarch64_preferred_simd_mode (enum machine_mode mode)
   return word_mode;
 }
 
+/* Implement TARGET_MANGLE_TYPE.  */
+
+const char *
+aarch64_mangle_type (const_tree type)
+{
+  /* The AArch64 ABI documents say that "__va_list" has to be
+     managled as if it is in the "std" namespace.  */
+  if (lang_hooks.types_compatible_p (CONST_CAST_TREE (type), va_list_type))
+    return "St9__va_list";
+
+  /* Use the default mangling.  */
+  return NULL;
+}
+
 /* Legitimize a memory reference for sync primitive implemented using
    LDXR/STXR instructions.  We currently force the form of the reference
    to be indirect without offset.  */
@@ -6923,6 +6937,9 @@ aarch64_c_mode_for_suffix (char suffix)
 #undef TARGET_LIBGCC_CMP_RETURN_MODE
 #define TARGET_LIBGCC_CMP_RETURN_MODE aarch64_libgcc_cmp_return_mode
 
+#undef TARGET_MANGLE_TYPE
+#define TARGET_MANGLE_TYPE aarch64_mangle_type
+
 #undef TARGET_MEMORY_MOVE_COST
 #define TARGET_MEMORY_MOVE_COST aarch64_memory_move_cost
 
diff --git a/gcc/testsuite/g++.dg/abi/arm_va_list.C b/gcc/testsuite/g++.dg/abi/arm_va_list.C
index 45a426a..d983ee1 100644
--- a/gcc/testsuite/g++.dg/abi/arm_va_list.C
+++ b/gcc/testsuite/g++.dg/abi/arm_va_list.C
@@ -1,9 +1,10 @@
-// { dg-do compile }
+// { dg-do compile { target { aarch64*-*-* arm*-*-* } } }
 // { dg-options "-Wno-abi" }
-// { dg-require-effective-target arm_eabi }
+// { dg-require-effective-target arm_eabi { target arm*-*-* } }
 
 // AAPCS \S 7.1.4 requires that va_list be a typedef for "struct
 // __va_list".  The mangling is as if it were "std::__va_list".
+// So is required for the AArch64 target.
 // #include <stdarg.h>
 typedef __builtin_va_list va_list;