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Fri, 24 Jul 2020 14:32:24 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= Subject: [PATCH 1/3] configure: Fix atomic64 test for --enable-werror on macOS Date: Fri, 24 Jul 2020 16:32:18 +0200 Message-Id: <20200724143220.32751-2-thuth@redhat.com> In-Reply-To: <20200724143220.32751-1-thuth@redhat.com> References: <20200724143220.32751-1-thuth@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Received-SPF: pass client-ip=205.139.110.120; envelope-from=thuth@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/24 08:23:04 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Ed Maste , Christian Schoenebeck , Paolo Bonzini , Li-Wen Hsu , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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 Signed-off-by: Thomas Huth --- 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