Mercurial > gnulib
view m4/manywarnings-c++.m4 @ 40177:dcd889592b62
dtoastr,ftoastr,ldtoastr: port to c-strtod changes
Decouple these modules from c-strtod. Nowadays it’s reasonable to
assume the C99 signatures for strtod and strtold. Programs that
require stricter adherence to C99 should also use the strtod and
strtold modules as needed, and we no longer need the
HAVE_C99_STRTOLD macro.
* NEWS: Mention this.
* lib/ftoastr.c (STRTOF) [LENGTH == 3]: Assume strtold.
* m4/c-strtod.m4 (gl_C_STRTOLD): Do not define HAVE_C99_STRTOLD.
* modules/dtoastr, modules/ftoastr, modules/ldtoastr:
(Files): Remove m4/c-strtod.m4.
(configure.ac): Do not require gl_C99_STRTOLD, which no longer
exists.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 02 Feb 2019 13:01:55 -0800 |
parents | b06060465f09 |
children |
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# manywarnings-c++.m4 serial 3 dnl Copyright (C) 2008-2019 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. # Implementation of the specialization of gl_MANYWARN_ALL_GCC # for _AC_LANG = C++. AC_DEFUN([gl_MANYWARN_ALL_GCC_CXX_IMPL], [ AC_LANG_PUSH([C++]) dnl First, check for some issues that only occur when combining multiple dnl gcc warning categories. AC_REQUIRE([AC_PROG_CXX]) if test -n "$GXX"; then dnl Check if -W -Werror -Wno-missing-field-initializers is supported dnl with the current $CXX $CXXFLAGS $CPPFLAGS. AC_CACHE_CHECK([whether -Wno-missing-field-initializers is supported], [gl_cv_cxx_nomfi_supported], [gl_save_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS -W -Werror -Wno-missing-field-initializers" AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[]], [[]])], [gl_cv_cxx_nomfi_supported=yes], [gl_cv_cxx_nomfi_supported=no]) CXXFLAGS="$gl_save_CXXFLAGS" ]) if test "$gl_cv_cxx_nomfi_supported" = yes; then dnl Now check whether -Wno-missing-field-initializers is needed dnl for the { 0, } construct. AC_CACHE_CHECK([whether -Wno-missing-field-initializers is needed], [gl_cv_cxx_nomfi_needed], [gl_save_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS -W -Werror" AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[int f (void) { typedef struct { int a; int b; } s_t; s_t s1 = { 0, }; return s1.b; } ]], [[]])], [gl_cv_cxx_nomfi_needed=no], [gl_cv_cxx_nomfi_needed=yes]) CXXFLAGS="$gl_save_CXXFLAGS" ]) fi dnl Next, check if -Werror -Wuninitialized is useful with the dnl user's choice of $CXXFLAGS; some versions of gcc warn that it dnl has no effect if -O is not also used AC_CACHE_CHECK([whether -Wuninitialized is supported], [gl_cv_cxx_uninitialized_supported], [gl_save_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS -Werror -Wuninitialized" AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[]], [[]])], [gl_cv_cxx_uninitialized_supported=yes], [gl_cv_cxx_uninitialized_supported=no]) CXXFLAGS="$gl_save_CXXFLAGS" ]) fi # List all gcc warning categories. # To compare this list to your installed GCC's, run this Bash command: # # comm -3 \ # <(sed -n 's/^ *\(-[^ ]*\) .*/\1/p' manywarnings-c++.m4 | sort) \ # <(gcc --help=warnings | sed -n 's/^ \(-[^ ]*\) .*/\1/p' | sort | # grep -v -x -f <( # awk '/^[^#]/ {print $1}' ../build-aux/g++-warning.spec)) gl_manywarn_set= for gl_manywarn_item in \ -W \ -Wabi \ -Wabi-tag \ -Waddress \ -Waggressive-loop-optimizations \ -Wall \ -Wattributes \ -Wbool-compare \ -Wbuiltin-macro-redefined \ -Wcast-align \ -Wchar-subscripts \ -Wchkp \ -Wclobbered \ -Wcomment \ -Wcomments \ -Wconditionally-supported \ -Wconversion-null \ -Wcoverage-mismatch \ -Wcpp \ -Wctor-dtor-privacy \ -Wdate-time \ -Wdelete-incomplete \ -Wdelete-non-virtual-dtor \ -Wdeprecated \ -Wdeprecated-declarations \ -Wdisabled-optimization \ -Wdiv-by-zero \ -Wdouble-promotion \ -Weffc++ \ -Wempty-body \ -Wendif-labels \ -Wenum-compare \ -Wextra \ -Wformat-contains-nul \ -Wformat-extra-args \ -Wformat-nonliteral \ -Wformat-security \ -Wformat-signedness \ -Wformat-y2k \ -Wformat-zero-length \ -Wfree-nonheap-object \ -Wignored-qualifiers \ -Winherited-variadic-ctor \ -Winit-self \ -Winline \ -Wint-to-pointer-cast \ -Winvalid-memory-model \ -Winvalid-offsetof \ -Winvalid-pch \ -Wliteral-suffix \ -Wlogical-not-parentheses \ -Wlogical-op \ -Wmain \ -Wmaybe-uninitialized \ -Wmemset-transposed-args \ -Wmissing-braces \ -Wmissing-declarations \ -Wmissing-field-initializers \ -Wmissing-include-dirs \ -Wmultichar \ -Wnarrowing \ -Wnoexcept \ -Wnon-template-friend \ -Wnon-virtual-dtor \ -Wnonnull \ -Wodr \ -Wold-style-cast \ -Wopenmp-simd \ -Woverflow \ -Woverlength-strings \ -Woverloaded-virtual \ -Wpacked \ -Wpacked-bitfield-compat \ -Wparentheses \ -Wpmf-conversions \ -Wpointer-arith \ -Wpragmas \ -Wreorder \ -Wreturn-local-addr \ -Wreturn-type \ -Wsequence-point \ -Wshadow \ -Wshift-count-negative \ -Wshift-count-overflow \ -Wsign-promo \ -Wsized-deallocation \ -Wsizeof-array-argument \ -Wsizeof-pointer-memaccess \ -Wstack-protector \ -Wstrict-aliasing \ -Wstrict-null-sentinel \ -Wstrict-overflow \ -Wsuggest-attribute=const \ -Wsuggest-attribute=format \ -Wsuggest-attribute=noreturn \ -Wsuggest-attribute=pure \ -Wsuggest-final-methods \ -Wsuggest-final-types \ -Wsuggest-override \ -Wswitch \ -Wswitch-bool \ -Wsync-nand \ -Wsystem-headers \ -Wtrampolines \ -Wtrigraphs \ -Wtype-limits \ -Wuninitialized \ -Wunknown-pragmas \ -Wunsafe-loop-optimizations \ -Wunused \ -Wunused-but-set-parameter \ -Wunused-but-set-variable \ -Wunused-function \ -Wunused-label \ -Wunused-local-typedefs \ -Wunused-macros \ -Wunused-parameter \ -Wunused-result \ -Wunused-value \ -Wunused-variable \ -Wuseless-cast \ -Wvarargs \ -Wvariadic-macros \ -Wvector-operation-performance \ -Wvirtual-move-assign \ -Wvla \ -Wvolatile-register-var \ -Wwrite-strings \ -Wzero-as-null-pointer-constant \ \ ; do gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item" done # gcc --help=warnings outputs an unusual form for these options; list # them here so that the above 'comm' command doesn't report a false match. gl_manywarn_set="$gl_manywarn_set -Warray-bounds=2" gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc" gl_manywarn_set="$gl_manywarn_set -Wshift-overflow=2" gl_manywarn_set="$gl_manywarn_set -Wunused-const-variable=2" # These are needed for older GCC versions. if test -n "$GXX"; then case `($CXX --version) 2>/dev/null` in 'g++ (GCC) '[[0-3]].* | \ 'g++ (GCC) '4.[[0-7]].*) gl_manywarn_set="$gl_manywarn_set -fdiagnostics-show-option" gl_manywarn_set="$gl_manywarn_set -funit-at-a-time" ;; esac fi # Disable specific options as needed. if test "$gl_cv_cxx_nomfi_needed" = yes; then gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers" fi if test "$gl_cv_cxx_uninitialized_supported" = no; then gl_manywarn_set="$gl_manywarn_set -Wno-uninitialized" fi $1=$gl_manywarn_set AC_LANG_POP([C++]) ])