kc3-lang/gnulib/m4/manywarnings-c++.m4

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• Hash : f24fbe9d
  Author :
  Date : 2018-07-01T07:08:32
  

  manywarnings: omit -Wswitch-default
  
  This should make things more consistent, as we already ignore
  -Wswitch-enum.  Problem reported by Reuben Thomas; see:
  https://lists.gnu.org/r/bug-gnulib/2018-05/msg00179.html
  * build-aux/g++-warning.spec, build-aux/gcc-warning.spec:
  Add -Wswitch-default.
  * m4/manywarnings-c++.m4 (gl_MANYWARN_ALL_GCC_CXX_IMPL):
  * m4/manywarnings.m4 (gl_MANYWARN_ALL_GCC):
  Remove -Wswitch-default.
  

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• m4/manywarnings-c++.m4

• # manywarnings-c++.m4 serial 2
  dnl Copyright (C) 2008-2018 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 $CPPFLAGS.
      AC_MSG_CHECKING([whether -Wno-missing-field-initializers is supported])
      AC_CACHE_VAL([gl_cv_cxx_nomfi_supported], [
        gl_save_CXXFLAGS="$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"])
      AC_MSG_RESULT([$gl_cv_cxx_nomfi_supported])
  
      if test "$gl_cv_cxx_nomfi_supported" = yes; then
        dnl Now check whether -Wno-missing-field-initializers is needed
        dnl for the { 0, } construct.
        AC_MSG_CHECKING([whether -Wno-missing-field-initializers is needed])
        AC_CACHE_VAL([gl_cv_cxx_nomfi_needed], [
          gl_save_CXXFLAGS="$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"
        ])
        AC_MSG_RESULT([$gl_cv_cxx_nomfi_needed])
      fi
  
      dnl Next, check if -Werror -Wuninitialized is useful with the
      dnl user's choice of $CXXFLAGS; some versions of gcc warn that it
      dnl has no effect if -O is not also used
      AC_MSG_CHECKING([whether -Wuninitialized is supported])
      AC_CACHE_VAL([gl_cv_cxx_uninitialized_supported], [
        gl_save_CXXFLAGS="$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"])
      AC_MSG_RESULT([$gl_cv_cxx_uninitialized_supported])
  
    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++])
  ])
  

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