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# options to filter out, and why
--all-warnings alias for -Wall
--extra-warnings alias for -Wextra
-Wabi-tag c++
-Wabi= c++
-Waggregate-return obsolescent
-Waliasing fortran
-Walign-commons fortran
-Waligned-new c++
-Waligned-new=[none|global|all] c++
-Walloca we like alloca in small doses
-Walloca-larger-than=<number> FIXME: choose something sane?
-Walloc-size-larger-than= handled specially by gl_MANYWARN_ALL_GCC
-Walloc-zero Gnulib fixes this problem
-Wampersand fortran
-Wargument-mismatch fortran
-Warray-bounds covered by -Warray-bounds=
-Warray-bounds= handled specially by gl_MANYWARN_ALL_GCC
-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++14-compat c++
-Wc++17-compat c++
-Wc++1z-compat c++
-Wc-binding-type fortran
-Wc90-c99-compat c compatibility
-Wc99-c11-compat c compatibility
-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-conversion FIXME maybe? borderline. some will want this
-Wfloat-equal FIXME maybe? borderline. some will want this
-Wformat covered by -Wformat=2
-Wformat= gcc --help=warnings artifact
-Wformat-overflow covered by -Wformat-overflow=2
-Wformat-overflow= handled specially by gl_MANYWARN_ALL_GCC
-Wformat-truncation covered by -Wformat-truncation=2
-Wformat-truncation= handled specially by gl_MANYWARN_ALL_GCC
-Wframe-larger-than=<number> FIXME: choose something sane?
-Wfunction-elimination fortran
-Wimplicit-fallthrough covered by -Wimplicit-fallthrough=2
-Wimplicit-fallthrough= handled specially by gl_MANYWARN_ALL_GCC
-Wimplicit-interface fortran
-Wimplicit-procedure fortran
-Winherited-variadic-ctor c++
-Winteger-division fortran
-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
-Wlto-type-mismatch c++ and objc++
-Wmissing-format-attribute obsolescent
-Wmissing-noreturn obsolescent
-Wmultiple-inheritance c++ and objc++
-Wnamespaces c++
-Wnoexcept c++
-Wnoexcept-type c++
-Wnon-template-friend c++
-Wnon-virtual-dtor c++
-Wnormalized covered by -Wnormalized=
-Wnormalized=[none|id|nfc|nfkc] handled specially by gl_MANYWARN_ALL_GCC
-Wold-style-cast c++ and objc++
-Woverloaded-virtual c++
-Woverride-init-side-effects c++ and objc++
-Wpadded FIXME maybe? warns about "stabil" member in /usr/include/bits/timex.h
-Wpedantic FIXME: too strict?
-Wplacement-new c++
-Wplacement-new= c++
-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
-Wregister c++ and objc++
-Wreorder c++ and objc++
-Wselector objc and objc++
-Wshadow-ivar objc
-Wshadow=compatible-local covered by -Wshadow
-Wshadow-compatible-local covered by -Wshadow
-Wshadow=global covered by -Wshadow
-Wshadow=local covered by -Wshadow
-Wshadow-local covered by -Wshadow
-Wshift-overflow covered by -Wshift-overflow=2
-Wshift-overflow= gcc --help=warnings artifact
-Wsign-compare FIXME maybe? borderline. some will want this
-Wsign-conversion FIXME maybe? borderline. some will want this
-Wsign-promo c++ and objc++
-Wsized-deallocation c++ and objc++
-Wstack-usage=<number> 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++
-Wstringop-overflow covered by -Wstringop-overflow=
-Wstringop-overflow= handled specially by gl_MANYWARN_ALL_GCC
-Wsubobject-linkage c++ and objc++
-Wsuggest-override c++ and objc++
-Wsurprising fortran
-Wswitch-enum FIXME maybe? borderline. some will want this
-Wsynth deprecated
-Wtabs fortran
-Wtarget-lifetime fortran
-Wtemplates c++ and objc++
-Wterminate c++ and objc++
-Wtraditional obsolescent
-Wtraditional-conversion obsolescent
-Wundeclared-selector objc and objc++
-Wundef FIXME maybe? too many false positives
-Wundefined-do-loop fortran
-Wunderflow fortran
-Wunreachable-code obsolescent no-op
-Wunsuffixed-float-constants triggers warning in gnulib's timespec.h
-Wunused-const-variable covered by -Wunusec-const-variable=2
-Wunused-const-variable= gcc --help=warnings artifact
-Wunused-dummy-argument fortran
-Wuse-without-only fortran
-Wuseless-cast c++ and objc++
-Wvirtual-inheritance c++
-Wvirtual-move-assign c++
-Wvla-larger-than=<number> handled specially by gl_MANYWARN_ALL_GCC
-Wzero-as-null-pointer-constant c++ and objc++
-Wzerotrip fortran
-frequire-return-statement go
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