#9678: Warning about __sync_fetch_and_nand semantics from gcc -------------------------------------+------------------------------------- Reporter: gintas | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.9 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- When building ghc, I'm getting warnings about __sync_fetch_and_nand that the semantics have changed for gcc 4.4+. I'm building on Windows, but I don't think that matters. Is this an indication of a problem or does that warning just need to be silenced? I ran the build with gcc 4.8.3: $ inplace/mingw/bin/gcc -v Using built-in specs. COLLECT_GCC=C:\msys64\home\Gintas\ghc\inplace\mingw\bin\gcc.exe COLLECT_LTO_WRAPPER=C:/msys64/home/Gintas/ghc/inplace/mingw/bin/../libexec/gcc/x86_64-w64-mingw32/4.8.3 /lto-wrapper.exe Target: x86_64-w64-mingw32 Configured with: ../../../src/gcc-4.8.3/configure --host=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --prefix=/mingw64 --with- sysroot=/c/mingw483/x86_64-483-posix-seh-rt_v3-rev0/mingw64 --with-gxx- include-dir=/mingw64/x86_64-w64-mingw32/include/c++ --enable-shared --enable-static --disable-multilib --enable- languages=ada,c,c++,fortran,objc,obj-c++,lto --enable-libstdcxx-time=yes --enable-threads=posix --enable-libgomp --enable-lto --enable-graphite --enable-checking=release --enable-fully-dynamic-string --enable-version- specific-runtime-libs --disable-isl-version-check --disable-cloog-version- check --disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --with-gnu-as --with-gnu-ld --with-arch=nocona --with- tune=core2 --with-libiconv --with-system-zlib --with- gmp=/c/mingw483/prerequisites/x86_64-w64-mingw32-static --with- mpfr=/c/mingw483/prerequisites/x86_64-w64-mingw32-static --with- mpc=/c/mingw483/prerequisites/x86_64-w64-mingw32-static --with- isl=/c/mingw483/prerequisites/x86_64-w64-mingw32-static --with- cloog=/c/mingw483/prerequisites/x86_64-w64-mingw32-static --enable-cloog- backend=isl --with-pkgversion='x86_64-posix-seh-rev0, Built by MinGW-W64 project' --with-bugurl=http://sourceforge.net/projects/mingw-w64 CFLAGS='-O2 -pipe -I/c/mingw483/x86_64-483-posix-seh- rt_v3-rev0/mingw64/opt/include -I/c/mingw483/prerequisites/x86_64-zlib- static/include -I/c/mingw483/prerequisites/x86_64-w64-mingw32-static/include' CXXFLAGS='-O2 -pipe -I/c/mingw483/x86_64-483-posix-seh- rt_v3-rev0/mingw64/opt/include -I/c/mingw483/prerequisites/x86_64-zlib- static/include -I/c/mingw483/prerequisites/x86_64-w64-mingw32-static/include' CPPFLAGS= LDFLAGS='-pipe -L/c/mingw483/x86_64-483-posix-seh- rt_v3-rev0/mingw64/opt/lib -L/c/mingw483/prerequisites/x86_64-zlib- static/lib -L/c/mingw483/prerequisites/x86_64-w64-mingw32-static/lib' Thread model: posix gcc version 4.8.3 (x86_64-posix-seh-rev0, Built by MinGW-W64 project) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9678 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler