#9727: -Werror=unused-but-set-variable causes validation error on Windows -------------------------------------+------------------------------------- Reporter: gintas | Owner: gintas Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.9 Keywords: | Operating System: Windows Architecture: Unknown/Multiple | Type of failure: Building Difficulty: Unknown | GHC failed Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- After upgrading the inplace mingw to gcc 4.8.3, validate.sh fails with the following error: cc1.exe: error: -Werror=unused-but-set-variable: No option -Wunused-but- set-variable The cause is in mk/validate-settings.mk: ifeq "$(GccLT46)" "NO" SRC_CC_WARNING_OPTS += -Werror=unused-but-set-variable # gcc 4.6 gives 3 warning for giveCapabilityToTask not being inlined SRC_CC_WARNING_OPTS += -Wno-error=inline endif This checks the version of the inplace mingw, but the actual command line that fails is not using the inplace mingw (4.8.3), but the host ghc's mingw (4.5.3, in /usr/local/mingw). Command line: C:/Users/Gintas/Downloads/msys32/usr/local/mingw/bin/../libexec/gcc/mingw32/4.5.2/cc1.exe -quiet -v -Icompiler/. -Icompiler/parser -Icompiler/utils -Icompiler/stage1 -Icompiler/stage1/build/autogen -IC:\Users\Gintas\Downloads\msys32\home\Gintas\ghc\inplace/lib/include/ -iprefix c:\users\gintas\downloads\msys32\usr\local\mingw\bin\../lib/gcc/mingw32/4.5.2/ -isystem C:/Users/Gintas/Downloads/msys32/usr/local/mingw/bin/../lib/gcc/mingw32/4.5.2/include -isystem C:/Users/Gintas/Downloads/msys32/usr/local/mingw/bin/../lib/gcc/mingw32/4.5.2 /include-fixed -U__i686 -Di386_HOST_ARCH=1 -Dmingw32_HOST_OS=1 -D__GLASGOW_HASKELL__=708 -U__i686 -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\process-1.2.0.0\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\directory-1.2.1.0\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\time-1.4.2\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\Win32-2.3.0.2\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\bytestring-0.10.4.0\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\base-4.7.0.1\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib\integer- gmp-0.5.1.0\include -isystemC:\Users\Gintas\Downloads\msys32\usr\local\lib/include -include compiler/stage1/build/autogen/cabal_macros.h compiler/stage1/build/Fingerprint_hsc_make.c -quiet -dumpbase Fingerprint_hsc_make.c -march=i686 -march=i686 -auxbase-strip compiler/stage1/build/Fingerprint_hsc_make.o -Werror -Wall -Werror=unused- but-set-variable -Wno-error=inline -version -fno-stack-protector -o C:\Users\Gintas\Downloads\msys32\tmp\ccvafaLk.s -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9727 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler