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misc/cgo/test: skip test7978 when using unsupported compilers 

On Darwin/ARM, because libSystem doesn't provide functions for
__sync_fetch_and_add, and only clang can inline that function,
skip the test when building with GCC.

Change-Id: Id5e9d8f9bbe1e6bcb2f381f0f66cf68aa95277c7
Reviewed-on: https://go-review.googlesource.com/2125
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Shenghou Ma 2014-12-26 01:20:29 -05:00 committed by Minux Ma
parent a5bff443c7
commit 5b806e58e2
1 changed files with 18 additions and 0 deletions
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18
misc/cgo/test/issue7978.go
View File

@ -12,9 +12,23 @@ package cgotest
void issue7978cb(void);
#if defined(__APPLE__) && defined(__arm__)
// on Darwin/ARM, libSystem doesn't provide implementation of the __sync_fetch_and_add
// primitive, and although gcc supports it, it doesn't inline its definition.
// Clang could inline its definition, so we require clang on Darwin/ARM.
#if defined(__clang__)
#define HAS_SYNC_FETCH_AND_ADD 1
#else
#define HAS_SYNC_FETCH_AND_ADD 0
#endif
#else
#define HAS_SYNC_FETCH_AND_ADD 1
#endif
// use ugly atomic variable sync since that doesn't require calling back into
// Go code or OS dependencies
static void issue7978c(uint32_t *sync) {
#if HAS_SYNC_FETCH_AND_ADD
while(__sync_fetch_and_add(sync, 0) != 0)
;
__sync_fetch_and_add(sync, 1);
@ -24,6 +38,7 @@ static void issue7978c(uint32_t *sync) {
__sync_fetch_and_add(sync, 1);
while(__sync_fetch_and_add(sync, 0) != 6)
;
#endif
}
*/
import "C"
@ -85,6 +100,9 @@ func test7978(t *testing.T) {
if runtime.Compiler == "gccgo" {
t.Skip("gccgo can not do stack traces of C code")
}
if C.HAS_SYNC_FETCH_AND_ADD == 0 {
t.Skip("clang required for __sync_fetch_and_add support on darwin/arm")
}
if os.Getenv("GOTRACEBACK") != "2" {
t.Fatalf("GOTRACEBACK must be 2")
}