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[PATCH 1/3] configure: Fix atomic64 test for --enable-werror on macOS
From: |
Thomas Huth |
Subject: |
[PATCH 1/3] configure: Fix atomic64 test for --enable-werror on macOS |
Date: |
Fri, 24 Jul 2020 16:32:18 +0200 |
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>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
configure | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/configure b/configure
index 4bd80ed507..9eaf501f50 100755
--- a/configure
+++ b/configure
@@ -5919,11 +5919,11 @@ 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);
--
2.18.1
Re: [PATCH 2/3] cirrus.yml: Compile macOS and FreeBSD with -Werror, Peter Maydell, 2020/07/24
Re: [PATCH 2/3] cirrus.yml: Compile macOS and FreeBSD with -Werror, Ed Maste, 2020/07/26
[PATCH 1/3] configure: Fix atomic64 test for --enable-werror on macOS,
Thomas Huth <=
[PATCH 3/3] cirrus.yml: Update the macOS jobs to Catalina, Thomas Huth, 2020/07/24