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216 lines
6.7 KiB
Plaintext
216 lines
6.7 KiB
Plaintext
# manywarnings.m4 serial 21
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dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Simon Josefsson
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# gl_MANYWARN_COMPLEMENT(OUTVAR, LISTVAR, REMOVEVAR)
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# --------------------------------------------------
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# Copy LISTVAR to OUTVAR except for the entries in REMOVEVAR.
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# Elements separated by whitespace. In set logic terms, the function
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# does OUTVAR = LISTVAR \ REMOVEVAR.
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AC_DEFUN([gl_MANYWARN_COMPLEMENT],
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[
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gl_warn_set=
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set x $2; shift
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for gl_warn_item
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do
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case " $3 " in
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*" $gl_warn_item "*)
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;;
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*)
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gl_AS_VAR_APPEND([gl_warn_set], [" $gl_warn_item"])
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;;
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esac
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done
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$1=$gl_warn_set
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])
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# gl_MANYWARN_ALL_GCC(VARIABLE)
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# -----------------------------
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# Add all documented GCC warning parameters to variable VARIABLE.
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# Note that you need to test them using gl_WARN_ADD if you want to
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# make sure your gcc understands it.
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#
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# The effects of this macro depend on the current language (_AC_LANG).
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AC_DEFUN([gl_MANYWARN_ALL_GCC],
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[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
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# Specialization for _AC_LANG = C.
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AC_DEFUN([gl_MANYWARN_ALL_GCC(C)],
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[
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AC_LANG_PUSH([C])
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dnl First, check for some issues that only occur when combining multiple
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dnl gcc warning categories.
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AC_REQUIRE([AC_PROG_CC])
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if test -n "$GCC"; then
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dnl Check if -Wextra -Werror -Wno-missing-field-initializers is supported
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dnl with the current $CC $CFLAGS $CPPFLAGS.
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AC_CACHE_CHECK([whether -Wno-missing-field-initializers is supported],
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[gl_cv_cc_nomfi_supported],
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[gl_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Wextra -Werror -Wno-missing-field-initializers"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[]], [[]])],
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[gl_cv_cc_nomfi_supported=yes],
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[gl_cv_cc_nomfi_supported=no])
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CFLAGS="$gl_save_CFLAGS"
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])
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if test "$gl_cv_cc_nomfi_supported" = yes; then
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dnl Now check whether -Wno-missing-field-initializers is needed
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dnl for the { 0, } construct.
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AC_CACHE_CHECK([whether -Wno-missing-field-initializers is needed],
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[gl_cv_cc_nomfi_needed],
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[gl_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Wextra -Werror"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[int f (void)
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{
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typedef struct { int a; int b; } s_t;
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s_t s1 = { 0, };
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return s1.b;
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}
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]],
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[[]])],
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[gl_cv_cc_nomfi_needed=no],
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[gl_cv_cc_nomfi_needed=yes])
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CFLAGS="$gl_save_CFLAGS"
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])
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fi
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dnl Next, check if -Werror -Wuninitialized is useful with the
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dnl user's choice of $CFLAGS; some versions of gcc warn that it
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dnl has no effect if -O is not also used
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AC_CACHE_CHECK([whether -Wuninitialized is supported],
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[gl_cv_cc_uninitialized_supported],
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[gl_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -Wuninitialized"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[]], [[]])],
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[gl_cv_cc_uninitialized_supported=yes],
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[gl_cv_cc_uninitialized_supported=no])
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CFLAGS="$gl_save_CFLAGS"
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])
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fi
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# List all gcc warning categories.
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# To compare this list to your installed GCC's, run this Bash command:
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#
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# comm -3 \
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# <((sed -n 's/^ *\(-[^ 0-9][^ ]*\).*/\1/p' manywarnings.m4; \
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# awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec) | sort) \
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# <(LC_ALL=C gcc --help=warnings | sed -n 's/^ \(-[^ ]*\) .*/\1/p' | sort)
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$1=
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for gl_manywarn_item in -fanalyzer -fno-common \
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-Wall \
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-Warith-conversion \
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-Wbad-function-cast \
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-Wcast-align=strict \
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-Wdate-time \
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-Wdisabled-optimization \
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-Wdouble-promotion \
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-Wduplicated-branches \
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-Wduplicated-cond \
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-Wextra \
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-Wformat-signedness \
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-Winit-self \
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-Winline \
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-Winvalid-pch \
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-Wlogical-op \
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-Wmissing-declarations \
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-Wmissing-include-dirs \
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-Wmissing-prototypes \
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-Wnested-externs \
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-Wnull-dereference \
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-Wold-style-definition \
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-Wopenmp-simd \
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-Woverlength-strings \
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-Wpacked \
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-Wpointer-arith \
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-Wshadow \
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-Wstack-protector \
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-Wstrict-overflow \
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-Wstrict-prototypes \
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-Wsuggest-attribute=cold \
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-Wsuggest-attribute=const \
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-Wsuggest-attribute=format \
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-Wsuggest-attribute=malloc \
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-Wsuggest-attribute=noreturn \
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-Wsuggest-attribute=pure \
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-Wsuggest-final-methods \
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-Wsuggest-final-types \
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-Wsync-nand \
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-Wsystem-headers \
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-Wtrampolines \
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-Wuninitialized \
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-Wunknown-pragmas \
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-Wunsafe-loop-optimizations \
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-Wunused-macros \
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-Wvariadic-macros \
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-Wvector-operation-performance \
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-Wvla \
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-Wwrite-strings \
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\
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; do
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gl_AS_VAR_APPEND([$1], [" $gl_manywarn_item"])
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done
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# gcc --help=warnings outputs an unusual form for these options; list
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# them here so that the above 'comm' command doesn't report a false match.
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gl_AS_VAR_APPEND([$1], [' -Warray-bounds=2'])
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gl_AS_VAR_APPEND([$1], [' -Wattribute-alias=2'])
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gl_AS_VAR_APPEND([$1], [' -Wformat-overflow=2'])
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gl_AS_VAR_APPEND([$1], [' -Wformat=2'])
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gl_AS_VAR_APPEND([$1], [' -Wformat-truncation=2'])
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gl_AS_VAR_APPEND([$1], [' -Wimplicit-fallthrough=5'])
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gl_AS_VAR_APPEND([$1], [' -Wshift-overflow=2'])
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gl_AS_VAR_APPEND([$1], [' -Wunused-const-variable=2'])
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gl_AS_VAR_APPEND([$1], [' -Wvla-larger-than=4031'])
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# These are needed for older GCC versions.
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if test -n "$GCC"; then
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case `($CC --version) 2>/dev/null` in
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'gcc (GCC) '[[0-3]].* | \
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'gcc (GCC) '4.[[0-7]].*)
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gl_AS_VAR_APPEND([$1], [' -fdiagnostics-show-option'])
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gl_AS_VAR_APPEND([$1], [' -funit-at-a-time'])
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;;
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esac
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fi
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# Disable specific options as needed.
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if test "$gl_cv_cc_nomfi_needed" = yes; then
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gl_AS_VAR_APPEND([$1], [' -Wno-missing-field-initializers'])
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fi
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if test "$gl_cv_cc_uninitialized_supported" = no; then
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gl_AS_VAR_APPEND([$1], [' -Wno-uninitialized'])
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fi
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# Some warnings have too many false alarms in GCC 10.1.
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93695
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gl_AS_VAR_APPEND([$1], [' -Wno-analyzer-double-free'])
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94458
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gl_AS_VAR_APPEND([$1], [' -Wno-analyzer-malloc-leak'])
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94851
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gl_AS_VAR_APPEND([$1], [' -Wno-analyzer-null-dereference'])
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95758
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gl_AS_VAR_APPEND([$1], [' -Wno-analyzer-use-after-free'])
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AC_LANG_POP([C])
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])
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# Specialization for _AC_LANG = C++.
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AC_DEFUN([gl_MANYWARN_ALL_GCC(C++)],
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[
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gl_MANYWARN_ALL_GCC_CXX_IMPL([$1])
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])
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