[GHC] #9678: Warning about __sync_fetch_and_nand semantics from gcc
#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
#9678: Warning about __sync_fetch_and_nand semantics from gcc -------------------------------------+------------------------------------- Reporter: gintas | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Build | Version: 7.9 System | Keywords: Resolution: wontfix | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by tibbe): * status: new => closed * resolution: => wontfix Comment: It's only a problem if you're not on GCC 4.4+. The warning is a bit annoying because it's there even though we want the post GCC 4.4 semantics. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9678#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9678: Warning about __sync_fetch_and_nand semantics from gcc -------------------------------------+------------------------------------- Reporter: gintas | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Build | Version: 7.9 System | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by gintas): * status: closed => new * resolution: wontfix => -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9678#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9678: Warning about __sync_fetch_and_nand semantics from gcc -------------------------------------+------------------------------------- Reporter: gintas | Owner: Type: bug | Status: patch Priority: normal | Milestone: Component: Build | Version: 7.9 System | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: Phab:D334 | -------------------------------------+------------------------------------- Changes (by gintas): * status: new => patch * differential: => Phab:D334 Comment: The warning is intended to be suppressed once callsites are taken care of. Why not do just that? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9678#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
austin says: In general I think we should actively move this to an autoconf check
#9678: Warning about __sync_fetch_and_nand semantics from gcc -------------------------------------+------------------------------------- Reporter: gintas | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Build System | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * priority: normal => low * status: patch => new * differential: Phab:D334 => Comment: that then sets ghc-options appropriately, based on if the C compiler specified actually supports this flag or not. This will be much more robust in general, I think.
gintas says: Makes sense. Probably more trouble than it's worth, that warning should get dropped from gcc eventually...
-- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9678#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9678: Warning about __sync_fetch_and_nand semantics from gcc
-------------------------------------+-------------------------------------
Reporter: gintas | Owner:
Type: bug | Status: new
Priority: low | Milestone:
Component: Build System | Version: 7.9
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: Incorrect | Unknown/Multiple
warning at compile-time | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
-------------------------------------+-------------------------------------
Comment (by Thomas Miedema
#9678: Warning about __sync_fetch_and_nand semantics from gcc -------------------------------------+------------------------------------- Reporter: gintas | Owner: Type: bug | Status: closed Priority: low | Milestone: 8.2.1 Component: Build System | Version: 7.9 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by thomie): * status: new => closed * resolution: => fixed * milestone: => 8.2.1 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9678#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9678: Warning about __sync_fetch_and_nand semantics from gcc
-------------------------------------+-------------------------------------
Reporter: gintas | Owner: (none)
Type: bug | Status: closed
Priority: low | Milestone: 8.2.1
Component: Build System | Version: 7.9
Resolution: fixed | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: Incorrect | Unknown/Multiple
warning at compile-time | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
-------------------------------------+-------------------------------------
Comment (by Ben Gamari
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