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Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 Subject: Re: [PATCH v2 4/8] configure: Disable out-of-line atomic operations on Aarch64 Content-Language: en-US To: Paolo Bonzini , Richard Henderson , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Akihiko Odaki , qemu-devel@nongnu.org References: <20220215170106.95848-1-f4bug@amsat.org> <20220215170106.95848-5-f4bug@amsat.org> <1872c662-9363-6d49-d057-9be7ab7c6e0b@linaro.org> <5356ac8a-cfbf-cfcb-13c5-872ecaf7bed2@amsat.org> <996032dd-4f00-6480-a485-80d49fb70c67@gmail.com> <02c7d441-815b-2fd8-21dc-8357b5cd6ebb@amsat.org> <94417e74-a2e8-f23d-b4fd-e53c9d3c8323@linaro.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a00:1450:4864:20::42e (failed) Received-SPF: pass client-ip=2a00:1450:4864:20::42e; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wr1-x42e.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, NICE_REPLY_A=-0.001, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Roman Bolshakov , Christian Schoenebeck , Andrew Jones , Stefan Hajnoczi Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 18/2/22 16:36, Paolo Bonzini wrote: > On 2/18/22 02:46, Richard Henderson wrote: >>>>> >>>>> I don't have gobjc/g++ installed, so ./configure defaulted to Clang to >>>>> compile these languages, but compiled C files using GCC. At the end >>>>> the >>>>> Clang linker is used (the default c++ symlink). >> >> This is another form of compiler mis-configuration. >> If you don't have g++ to go with gcc, use --cxx=false to avoid picking >> up a different compiler. > > This would be the kind of problem that this test is trying to cover: > >     if do_cxx $CXXFLAGS $EXTRA_CXXFLAGS $CONFIGURE_CXXFLAGS > $QEMU_CXXFLAGS -o $TMPE $TMPCXX $TMPO $QEMU_LDFLAGS; then >         # C++ compiler $cxx works ok with C compiler $cc >         : >     else >         echo "C++ compiler $cxx does not work with C compiler $cc" >         echo "Disabling C++ specific optional code" >         cxx= >     fi > > In the past it detected issues with libasan/libtsan incompatibilities. > We should either add a test for atomic operations, or just drop the > test. We shouldn't assume gcc is GCC: $ c++ --version Apple clang version 13.0.0 (clang-1300.0.29.30) Target: arm64-apple-darwin21.3.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin $ g++ --version Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1 Apple clang version 13.0.0 (clang-1300.0.29.30) Target: arm64-apple-darwin21.3.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin $ gcc --version Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1 Apple clang version 13.0.0 (clang-1300.0.29.30) Target: arm64-apple-darwin21.3.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin $ clang --version Apple clang version 13.0.0 (clang-1300.0.29.30) Target: arm64-apple-darwin21.3.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin