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# options to filter out, and why
--all-warnings alias for -Wall
--extra-warnings alias for -Wextra
-Wabi-tag c++
-Waggregate-return obsolescent
-Waliasing fortran
-Walign-commons fortran
-Wampersand fortran
-Warray-temporaries fortran
-Wassign-intercept objc/objc++
-Wc++-compat FIXME maybe? borderline. some will want this
-Wc++0x-compat c++
-Wc++11-compat c++
-Wc-binding-type fortran
-Wcast-qual FIXME maybe? too much noise; encourages bad changes
-Wcharacter-truncation fortran
-Wcompare-reals fortran
-Wconditionally-supported c++ and objc++
-Wconversion FIXME maybe? too much noise; encourages bad changes
-Wconversion-extra fortran
-Wconversion-null c++ and objc++
-Wctor-dtor-privacy c++
-Wdeclaration-after-statement FIXME: do not want. others may
-Wdelete-incomplete c++ and objc++
-Wdelete-non-virtual-dtor c++
-Weffc++ c++
-Werror-implicit-function-declaration deprecated
-Wfloat-equal FIXME maybe? borderline. some will want this
-Wformat covered by -Wformat=2
-Wformat= gcc --help=warnings artifact
-Wfunction-elimination fortran
-Wimplicit-interface fortran
-Wimplicit-procedure fortran
-Winherited-variadic-ctor c++
-Wintrinsic-shadow fortran
-Wintrinsics-std fortran
-Winvalid-offsetof c++ and objc++
-Wlarger-than- gcc --help=warnings artifact
-Wlarger-than=<number> FIXME: choose something sane?
-Wline-truncation fortran
-Wliteral-suffix c++ and objc++
-Wlong-long obsolescent
-Wnoexcept c++
-Wnon-template-friend c++
-Wnon-virtual-dtor c++
-Wnormalized=<id|nfc|nfkc> FIXME: choose something sane?
-Wold-style-cast c++ and objc++
-Woverloaded-virtual c++
-Wpadded FIXME maybe? warns about "stabil" member in /usr/include/bits/timex.h
-Wpedantic FIXME: too strict?
-Wpmf-conversions c++ and objc++
-Wproperty-assign-default objc++
-Wprotocol objc++
-Wreal-q-constant fortran
-Wrealloc-lhs fortran
-Wrealloc-lhs-all fortran
-Wredundant-decls FIXME maybe? many _gl_cxxalias_dummy FPs
-Wreorder c++ and objc++
-Wselector objc and objc++
-Wsign-compare FIXME maybe? borderline. some will want this
-Wsign-conversion FIXME maybe? borderline. some will want this
-Wsign-promo c++ and objc++
-Wstack-usage= FIXME: choose something sane?
-Wstrict-aliasing= FIXME: choose something sane?
-Wstrict-null-sentinel c++ and objc++
-Wstrict-overflow= FIXME: choose something sane?
-Wstrict-selector-match objc and objc++
-Wsurprising fortran
-Wswitch-enum FIXME maybe? borderline. some will want this
-Wsynth deprecated
-Wtabs fortran
-Wtarget-lifetime fortran
-Wtraditional obsolescent
-Wtraditional-conversion obsolescent
-Wundeclared-selector objc and objc++
-Wundef FIXME maybe? too many false positives
-Wunderflow fortran
-Wunsuffixed-float-constants triggers warning in gnulib's timespec.h
-Wunused-dummy-argument fortran
-Wuseless-cast c++ and objc++
-Wvirtual-move-assign c++
-Wzero-as-null-pointer-constant c++ and objc++
-Wzerotrip fortran
-frequire-return-statement go
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