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# options to filter out, and why
--all-warnings alias for -Wall
--extra-warnings alias for -Wextra
-frequire-return-statement go
-Waggregate-return obsolescent
-Waliasing fortran
-Walign-commons fortran
-Wampersand fortran
-Warray-bounds covered by -Warray-bounds=
-Warray-bounds= handled specially by gl_MANYWARN_ALL_GCC
-Warray-temporaries fortran
-Wassign-intercept objc/objc++
-Wbad-function-cast c
-Wc++0x-compat c++ compatibility
-Wc++11-compat c++ compatibility
-Wc++14-compat c++ compatibility
-Wc90-c99-compat c compatibility
-Wc99-c11-compat c compatibility
-Wcast-qual FIXME maybe? too much noise; encourages bad changes
-Wcast-result d
-Wc-binding-type fortran
-Wc++-compat FIXME maybe? borderline. some will want this
-Wcharacter-truncation fortran
-Wcompare-reals fortran
-Wconversion-extra fortran
-Wconversion FIXME maybe? too much noise; encourages bad changes
-Wdeclaration-after-statement FIXME: do not want. others may
-Wdesignated-init c
-Wdiscarded-array-qualifiers c
-Wdiscarded-qualifiers 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
-Wframe-larger-than=<number> FIXME: choose something sane?
-Wfunction-elimination fortran
-Wimplicit c
-Wimplicit-function-declaration c
-Wimplicit-int c
-Wimplicit-interface fortran
-Wimplicit-procedure fortran
-Wincompatible-pointer-types c
-Wint-conversion c
-Winteger-division fortran
-Wintrinsic-shadow fortran
-Wintrinsics-std fortran
-Wjump-misses-init c
-Wlarger-than- gcc --help=warnings artifact
-Wlarger-than=<number> FIXME: choose something sane?
-Wline-truncation fortran
-Wlong-long obsolescent
-Wmissing-format-attribute obsolescent
-Wmissing-noreturn obsolescent
-Wmissing-parameter-type c
-Wmissing-prototypes c
-Wnested-externs c
-Wnormalized covered by -Wnormalized=
-Wnormalized=<none|id|nfc|nfkc> handled specially by gl_MANYWARN_ALL_GCC
-Wold-style-declaration c
-Wold-style-definition c
-Woverride-init c
-Wpadded FIXME maybe? warns about "stabil" member in /usr/include/bits/timex.h
-Wpedantic FIXME: too strict?
-Wpointer-sign c
-Wpointer-to-int-cast c
-Wproperty-assign-default objc++
-Wprotocol objc++
-Wrealloc-lhs-all fortran
-Wrealloc-lhs fortran
-Wreal-q-constant fortran
-Wredundant-decls FIXME maybe? many _gl_cxxalias_dummy FPs
-Wselector objc and objc++
-Wshadow-ivar objc
-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
-Wstack-usage= FIXME: choose something sane?
-Wstrict-aliasing= FIXME: choose something sane?
-Wstrict-overflow= FIXME: choose something sane?
-Wstrict-prototypes c
-Wstrict-selector-match objc and objc++
-Wsurprising fortran
-Wswitch-default https://lists.gnu.org/r/bug-gnulib/2018-05/msg00179.html
-Wswitch-enum FIXME maybe? borderline. some will want this
-Wsynth deprecated
-Wtabs fortran
-Wtarget-lifetime fortran
-Wtraditional-conversion obsolescent
-Wtraditional obsolescent
-Wundeclared-selector objc and objc++
-Wundef FIXME maybe? too many false positives
-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
-Wzerotrip fortran
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