[PULL 1/8] configure: Fix atomic64 test for --enable-werror on macOS

[Thomas Huth]

When using --enable-werror for the macOS builders in the Cirrus-CI,
the atomic64 test is currently failing, and config.log shows a bunch
of error messages like this:

 config-temp/qemu-conf.c:6:7: error: implicit declaration of function
 '__atomic_load_8' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  y = __atomic_load_8(&x, 0);
      ^
 config-temp/qemu-conf.c:6:7: error: this function declaration is not a
 prototype [-Werror,-Wstrict-prototypes]

Seems like these __atomic_*_8 functions are available in one of the
libraries there, so that the test links and passes there when not
using --enable-werror. But there does not seem to be a valid prototype
for them in any of the header files, so that the test fails when using
--enable-werror.

Fix it by using the "official" built-in functions instead (see e.g.
https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html).
We are not using the *_8 variants in QEMU anyway.

Suggested-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200728074405.13118-2-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 configure | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/configure b/configure
index 8dc981684b..59b7310e15 100755
--- a/configure
+++ b/configure
@@ -5780,11 +5780,11 @@ int main(void)
 {
   uint64_t x = 0, y = 0;
 #ifdef __ATOMIC_RELAXED
-  y = __atomic_load_8(&x, 0);
-  __atomic_store_8(&x, y, 0);
-  __atomic_compare_exchange_8(&x, &y, x, 0, 0, 0);
-  __atomic_exchange_8(&x, y, 0);
-  __atomic_fetch_add_8(&x, y, 0);
+  y = __atomic_load_n(&x, __ATOMIC_RELAXED);
+  __atomic_store_n(&x, y, __ATOMIC_RELAXED);
+  __atomic_compare_exchange_n(&x, &y, x, 0, __ATOMIC_RELAXED, 
__ATOMIC_RELAXED);
+  __atomic_exchange_n(&x, y, __ATOMIC_RELAXED);
+  __atomic_fetch_add(&x, y, __ATOMIC_RELAXED);
 #else
   typedef char is_host64[sizeof(void *) >= sizeof(uint64_t) ? 1 : -1];
   __sync_lock_test_and_set(&x, y);
-- 
2.18.2