| 1 | dnl Autoconf configure script for GDB, the GNU debugger. |
| 2 | dnl Copyright (C) 1995-2019 Free Software Foundation, Inc. |
| 3 | dnl |
| 4 | dnl This file is part of GDB. |
| 5 | dnl |
| 6 | dnl This program is free software; you can redistribute it and/or modify |
| 7 | dnl it under the terms of the GNU General Public License as published by |
| 8 | dnl the Free Software Foundation; either version 3 of the License, or |
| 9 | dnl (at your option) any later version. |
| 10 | dnl |
| 11 | dnl This program is distributed in the hope that it will be useful, |
| 12 | dnl but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | dnl GNU General Public License for more details. |
| 15 | dnl |
| 16 | dnl You should have received a copy of the GNU General Public License |
| 17 | dnl along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | |
| 19 | AC_DEFUN([AM_GDB_WARNINGS],[ |
| 20 | AC_ARG_ENABLE(werror, |
| 21 | AS_HELP_STRING([--enable-werror], [treat compile warnings as errors]), |
| 22 | [case "${enableval}" in |
| 23 | yes | y) ERROR_ON_WARNING="yes" ;; |
| 24 | no | n) ERROR_ON_WARNING="no" ;; |
| 25 | *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;; |
| 26 | esac]) |
| 27 | |
| 28 | # Enable -Werror by default when using gcc. Turn it off for releases. |
| 29 | if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" && $development; then |
| 30 | ERROR_ON_WARNING=yes |
| 31 | fi |
| 32 | |
| 33 | WERROR_CFLAGS="" |
| 34 | if test "${ERROR_ON_WARNING}" = yes ; then |
| 35 | WERROR_CFLAGS="-Werror" |
| 36 | fi |
| 37 | |
| 38 | # The options we'll try to enable. |
| 39 | build_warnings="-Wall -Wpointer-arith \ |
| 40 | -Wno-unused -Wunused-value -Wunused-variable -Wunused-function \ |
| 41 | -Wno-switch -Wno-char-subscripts \ |
| 42 | -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable \ |
| 43 | -Wno-sign-compare -Wno-error=maybe-uninitialized \ |
| 44 | -Wno-mismatched-tags \ |
| 45 | -Wno-error=deprecated-register \ |
| 46 | -Wsuggest-override \ |
| 47 | -Wimplicit-fallthrough=3 \ |
| 48 | -Wduplicated-cond \ |
| 49 | -Wshadow=local \ |
| 50 | -Wdeprecated-copy \ |
| 51 | -Wdeprecated-copy-dtor \ |
| 52 | -Wredundant-move" |
| 53 | |
| 54 | case "${host}" in |
| 55 | *-*-mingw32*) |
| 56 | # Enable -Wno-format by default when using gcc on mingw since many |
| 57 | # GCC versions complain about %I64. |
| 58 | build_warnings="$build_warnings -Wno-format" ;; |
| 59 | *-*-solaris*) |
| 60 | # Solaris 11.4 <python2.7/ceval.h> uses #pragma no_inline that GCC |
| 61 | # doesn't understand. |
| 62 | build_warnings="$build_warnings -Wno-unknown-pragmas" |
| 63 | # Solaris 11 <unistd.h> marks vfork deprecated. |
| 64 | build_warnings="$build_warnings -Wno-deprecated-declarations" ;; |
| 65 | *) |
| 66 | # Note that gcc requires -Wformat for -Wformat-nonliteral to work, |
| 67 | # but there's a special case for this below. |
| 68 | build_warnings="$build_warnings -Wformat-nonliteral" ;; |
| 69 | esac |
| 70 | |
| 71 | AC_ARG_ENABLE(build-warnings, |
| 72 | AS_HELP_STRING([--enable-build-warnings], [enable build-time compiler warnings if gcc is used]), |
| 73 | [case "${enableval}" in |
| 74 | yes) ;; |
| 75 | no) build_warnings="-w";; |
| 76 | ,*) t=`echo "${enableval}" | sed -e "s/,/ /g"` |
| 77 | build_warnings="${build_warnings} ${t}";; |
| 78 | *,) t=`echo "${enableval}" | sed -e "s/,/ /g"` |
| 79 | build_warnings="${t} ${build_warnings}";; |
| 80 | *) build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;; |
| 81 | esac |
| 82 | if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then |
| 83 | echo "Setting compiler warning flags = $build_warnings" 6>&1 |
| 84 | fi])dnl |
| 85 | AC_ARG_ENABLE(gdb-build-warnings, |
| 86 | AS_HELP_STRING([--enable-gdb-build-warnings], [enable GDB specific build-time compiler warnings if gcc is used]), |
| 87 | [case "${enableval}" in |
| 88 | yes) ;; |
| 89 | no) build_warnings="-w";; |
| 90 | ,*) t=`echo "${enableval}" | sed -e "s/,/ /g"` |
| 91 | build_warnings="${build_warnings} ${t}";; |
| 92 | *,) t=`echo "${enableval}" | sed -e "s/,/ /g"` |
| 93 | build_warnings="${t} ${build_warnings}";; |
| 94 | *) build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;; |
| 95 | esac |
| 96 | if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then |
| 97 | echo "Setting GDB specific compiler warning flags = $build_warnings" 6>&1 |
| 98 | fi])dnl |
| 99 | |
| 100 | # The set of warnings supported by a C++ compiler is not the same as |
| 101 | # of the C compiler. |
| 102 | AC_LANG_PUSH([C++]) |
| 103 | |
| 104 | WARN_CFLAGS="" |
| 105 | if test "x${build_warnings}" != x -a "x$GCC" = xyes |
| 106 | then |
| 107 | AC_MSG_CHECKING(compiler warning flags) |
| 108 | # Separate out the -Werror flag as some files just cannot be |
| 109 | # compiled with it enabled. |
| 110 | for w in ${build_warnings}; do |
| 111 | # GCC does not complain about -Wno-unknown-warning. Invert |
| 112 | # and test -Wunknown-warning instead. |
| 113 | case $w in |
| 114 | -Wno-*) |
| 115 | wtest=`echo $w | sed 's/-Wno-/-W/g'` ;; |
| 116 | -Wformat-nonliteral) |
| 117 | # gcc requires -Wformat before -Wformat-nonliteral |
| 118 | # will work, so stick them together. |
| 119 | w="-Wformat $w" |
| 120 | wtest="$w" |
| 121 | ;; |
| 122 | *) |
| 123 | wtest=$w ;; |
| 124 | esac |
| 125 | |
| 126 | case $w in |
| 127 | -Werr*) WERROR_CFLAGS=-Werror ;; |
| 128 | *) |
| 129 | # Check whether GCC accepts it. |
| 130 | saved_CFLAGS="$CFLAGS" |
| 131 | CFLAGS="$CFLAGS -Werror $wtest" |
| 132 | saved_CXXFLAGS="$CXXFLAGS" |
| 133 | CXXFLAGS="$CXXFLAGS -Werror $wtest" |
| 134 | if test "x$w" = "x-Wunused-variable"; then |
| 135 | # Check for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38958, |
| 136 | # fixed in GCC 4.9. This test is derived from the gdb |
| 137 | # source code that triggered this bug in GCC. |
| 138 | AC_TRY_COMPILE( |
| 139 | [struct scoped_restore_base {}; |
| 140 | struct scoped_restore_tmpl : public scoped_restore_base { |
| 141 | ~scoped_restore_tmpl() {} |
| 142 | };], |
| 143 | [const scoped_restore_base &b = scoped_restore_tmpl();], |
| 144 | WARN_CFLAGS="${WARN_CFLAGS} $w",) |
| 145 | else |
| 146 | AC_TRY_COMPILE([],[],WARN_CFLAGS="${WARN_CFLAGS} $w",) |
| 147 | fi |
| 148 | CFLAGS="$saved_CFLAGS" |
| 149 | CXXFLAGS="$saved_CXXFLAGS" |
| 150 | esac |
| 151 | done |
| 152 | AC_MSG_RESULT(${WARN_CFLAGS} ${WERROR_CFLAGS}) |
| 153 | fi |
| 154 | AC_SUBST(WARN_CFLAGS) |
| 155 | AC_SUBST(WERROR_CFLAGS) |
| 156 | |
| 157 | AC_LANG_POP([C++]) |
| 158 | ]) |