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Diffstat (limited to 'm4/manywarnings.m4')
| -rw-r--r-- | m4/manywarnings.m4 | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4 new file mode 100644 index 0000000..f4b5853 --- /dev/null +++ b/m4/manywarnings.m4 @@ -0,0 +1,211 @@ +# 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], [' -Wbidi-chars=any,ucn']) + 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], [' -Wuse-after-free=3']) + 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]) +]) |