mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
210 lines
6.4 KiB
Plaintext
210 lines
6.4 KiB
Plaintext
# manywarnings.m4 serial 23
|
|
dnl Copyright (C) 2008-2022 Free Software Foundation, Inc.
|
|
dnl This file is free software; the Free Software Foundation
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
|
dnl with or without modifications, as long as this notice is preserved.
|
|
|
|
dnl From Simon Josefsson
|
|
|
|
# gl_MANYWARN_COMPLEMENT(OUTVAR, LISTVAR, REMOVEVAR)
|
|
# --------------------------------------------------
|
|
# Copy LISTVAR to OUTVAR except for the entries in REMOVEVAR.
|
|
# Elements separated by whitespace. In set logic terms, the function
|
|
# does OUTVAR = LISTVAR \ REMOVEVAR.
|
|
AC_DEFUN([gl_MANYWARN_COMPLEMENT],
|
|
[
|
|
gl_warn_set=
|
|
set x $2; shift
|
|
for gl_warn_item
|
|
do
|
|
case " $3 " in
|
|
*" $gl_warn_item "*)
|
|
;;
|
|
*)
|
|
gl_AS_VAR_APPEND([gl_warn_set], [" $gl_warn_item"])
|
|
;;
|
|
esac
|
|
done
|
|
$1=$gl_warn_set
|
|
])
|
|
|
|
# gl_MANYWARN_ALL_GCC(VARIABLE)
|
|
# -----------------------------
|
|
# Add all documented GCC warning parameters to variable VARIABLE.
|
|
# Note that you need to test them using gl_WARN_ADD if you want to
|
|
# make sure your gcc understands it.
|
|
#
|
|
# The effects of this macro depend on the current language (_AC_LANG).
|
|
AC_DEFUN([gl_MANYWARN_ALL_GCC],
|
|
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
|
|
|
|
# Specialization for _AC_LANG = C.
|
|
AC_DEFUN([gl_MANYWARN_ALL_GCC(C)],
|
|
[
|
|
AC_LANG_PUSH([C])
|
|
|
|
dnl First, check for some issues that only occur when combining multiple
|
|
dnl gcc warning categories.
|
|
AC_REQUIRE([AC_PROG_CC])
|
|
if test -n "$GCC"; then
|
|
|
|
dnl Check if -Wextra -Werror -Wno-missing-field-initializers is supported
|
|
dnl with the current $CC $CFLAGS $CPPFLAGS.
|
|
AC_CACHE_CHECK([whether -Wno-missing-field-initializers is supported],
|
|
[gl_cv_cc_nomfi_supported],
|
|
[gl_save_CFLAGS="$CFLAGS"
|
|
CFLAGS="$CFLAGS -Wextra -Werror -Wno-missing-field-initializers"
|
|
AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM([[]], [[]])],
|
|
[gl_cv_cc_nomfi_supported=yes],
|
|
[gl_cv_cc_nomfi_supported=no])
|
|
CFLAGS="$gl_save_CFLAGS"
|
|
])
|
|
|
|
if test "$gl_cv_cc_nomfi_supported" = yes; then
|
|
dnl Now check whether -Wno-missing-field-initializers is needed
|
|
dnl for the { 0, } construct.
|
|
AC_CACHE_CHECK([whether -Wno-missing-field-initializers is needed],
|
|
[gl_cv_cc_nomfi_needed],
|
|
[gl_save_CFLAGS="$CFLAGS"
|
|
CFLAGS="$CFLAGS -Wextra -Werror"
|
|
AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[int f (void)
|
|
{
|
|
typedef struct { int a; int b; } s_t;
|
|
s_t s1 = { 0, };
|
|
return s1.b;
|
|
}
|
|
]],
|
|
[[]])],
|
|
[gl_cv_cc_nomfi_needed=no],
|
|
[gl_cv_cc_nomfi_needed=yes])
|
|
CFLAGS="$gl_save_CFLAGS"
|
|
])
|
|
fi
|
|
|
|
dnl Next, check if -Werror -Wuninitialized is useful with the
|
|
dnl user's choice of $CFLAGS; some versions of gcc warn that it
|
|
dnl has no effect if -O is not also used
|
|
AC_CACHE_CHECK([whether -Wuninitialized is supported],
|
|
[gl_cv_cc_uninitialized_supported],
|
|
[gl_save_CFLAGS="$CFLAGS"
|
|
CFLAGS="$CFLAGS -Werror -Wuninitialized"
|
|
AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM([[]], [[]])],
|
|
[gl_cv_cc_uninitialized_supported=yes],
|
|
[gl_cv_cc_uninitialized_supported=no])
|
|
CFLAGS="$gl_save_CFLAGS"
|
|
])
|
|
|
|
fi
|
|
|
|
# List all gcc warning categories.
|
|
# To compare this list to your installed GCC's, run this Bash command:
|
|
#
|
|
# comm -3 \
|
|
# <((sed -n 's/^ *\(-[^ 0-9][^ ]*\).*/\1/p' manywarnings.m4; \
|
|
# awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec) | sort) \
|
|
# <(LC_ALL=C gcc --help=warnings | sed -n 's/^ \(-[^ ]*\) .*/\1/p' | sort)
|
|
|
|
$1=
|
|
for gl_manywarn_item in -fanalyzer -fno-common \
|
|
-Wall \
|
|
-Warith-conversion \
|
|
-Wbad-function-cast \
|
|
-Wcast-align=strict \
|
|
-Wdate-time \
|
|
-Wdisabled-optimization \
|
|
-Wdouble-promotion \
|
|
-Wduplicated-branches \
|
|
-Wduplicated-cond \
|
|
-Wextra \
|
|
-Wformat-signedness \
|
|
-Winit-self \
|
|
-Winline \
|
|
-Winvalid-pch \
|
|
-Wlogical-op \
|
|
-Wmissing-declarations \
|
|
-Wmissing-include-dirs \
|
|
-Wmissing-prototypes \
|
|
-Wnested-externs \
|
|
-Wnull-dereference \
|
|
-Wold-style-definition \
|
|
-Wopenmp-simd \
|
|
-Woverlength-strings \
|
|
-Wpacked \
|
|
-Wpointer-arith \
|
|
-Wshadow \
|
|
-Wstack-protector \
|
|
-Wstrict-overflow \
|
|
-Wstrict-prototypes \
|
|
-Wsuggest-attribute=cold \
|
|
-Wsuggest-attribute=const \
|
|
-Wsuggest-attribute=format \
|
|
-Wsuggest-attribute=malloc \
|
|
-Wsuggest-attribute=noreturn \
|
|
-Wsuggest-attribute=pure \
|
|
-Wsuggest-final-methods \
|
|
-Wsuggest-final-types \
|
|
-Wsync-nand \
|
|
-Wsystem-headers \
|
|
-Wtrampolines \
|
|
-Wuninitialized \
|
|
-Wunknown-pragmas \
|
|
-Wunsafe-loop-optimizations \
|
|
-Wunused-macros \
|
|
-Wvariadic-macros \
|
|
-Wvector-operation-performance \
|
|
-Wvla \
|
|
-Wwrite-strings \
|
|
\
|
|
; do
|
|
gl_AS_VAR_APPEND([$1], [" $gl_manywarn_item"])
|
|
done
|
|
|
|
# gcc --help=warnings outputs an unusual form for these options; list
|
|
# them here so that the above 'comm' command doesn't report a false match.
|
|
gl_AS_VAR_APPEND([$1], [' -Warray-bounds=2'])
|
|
gl_AS_VAR_APPEND([$1], [' -Wattribute-alias=2'])
|
|
gl_AS_VAR_APPEND([$1], [' -Wformat-overflow=2'])
|
|
gl_AS_VAR_APPEND([$1], [' -Wformat=2'])
|
|
gl_AS_VAR_APPEND([$1], [' -Wformat-truncation=2'])
|
|
gl_AS_VAR_APPEND([$1], [' -Wimplicit-fallthrough=5'])
|
|
gl_AS_VAR_APPEND([$1], [' -Wshift-overflow=2'])
|
|
gl_AS_VAR_APPEND([$1], [' -Wunused-const-variable=2'])
|
|
gl_AS_VAR_APPEND([$1], [' -Wvla-larger-than=4031'])
|
|
|
|
# These are needed for older GCC versions.
|
|
if test -n "$GCC"; then
|
|
case `($CC --version) 2>/dev/null` in
|
|
'gcc (GCC) '[[0-3]].* | \
|
|
'gcc (GCC) '4.[[0-7]].*)
|
|
gl_AS_VAR_APPEND([$1], [' -fdiagnostics-show-option'])
|
|
gl_AS_VAR_APPEND([$1], [' -funit-at-a-time'])
|
|
;;
|
|
esac
|
|
fi
|
|
|
|
# Disable specific options as needed.
|
|
if test "$gl_cv_cc_nomfi_needed" = yes; then
|
|
gl_AS_VAR_APPEND([$1], [' -Wno-missing-field-initializers'])
|
|
fi
|
|
|
|
if test "$gl_cv_cc_uninitialized_supported" = no; then
|
|
gl_AS_VAR_APPEND([$1], [' -Wno-uninitialized'])
|
|
fi
|
|
|
|
# This warning have too many false alarms in GCC 11.2.1.
|
|
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101713
|
|
gl_AS_VAR_APPEND([$1], [' -Wno-analyzer-malloc-leak'])
|
|
|
|
AC_LANG_POP([C])
|
|
])
|
|
|
|
# Specialization for _AC_LANG = C++.
|
|
AC_DEFUN([gl_MANYWARN_ALL_GCC(C++)],
|
|
[
|
|
gl_MANYWARN_ALL_GCC_CXX_IMPL([$1])
|
|
])
|