1 dnl Autoconf configure script for GDB, the GNU debugger.
2 dnl Copyright (C) 1995-2018 Free Software Foundation, Inc.
4 dnl This file is part of GDB.
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.
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.
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/>.
19 AC_DEFUN([AM_GDB_WARNINGS],[
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 ${enableval} for --enable-werror) ;;
28 # Enable -Werror by default when using gcc. Turn it off for releases.
29 if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" && $development; then
34 if test "${ERROR_ON_WARNING}" = yes ; then
35 WERROR_CFLAGS="-Werror"
38 # The options we'll try to enable.
39 build_warnings="-Wall -Wpointer-arith \
40 -Wno-unused -Wunused-value -Wunused-function \
41 -Wno-switch -Wno-char-subscripts \
42 -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable \
43 -Wno-sign-compare -Wno-narrowing -Wno-error=maybe-uninitialized \
44 -Wno-mismatched-tags \
45 -Wno-error=deprecated-register \
47 -Wimplicit-fallthrough=3 \
52 # Enable -Wno-format by default when using gcc on mingw since many
53 # GCC versions complain about %I64.
54 build_warnings="$build_warnings -Wno-format" ;;
56 # Solaris 11.4 <python2.7/ceval.h> uses #pragma no_inline that GCC
58 build_warnings="$build_warnings -Wno-unknown-pragmas"
59 # Solaris 11 <unistd.h> marks vfork deprecated.
60 build_warnings="$build_warnings -Wno-deprecated-declarations" ;;
61 *) build_warnings="$build_warnings -Wformat-nonliteral" ;;
64 AC_ARG_ENABLE(build-warnings,
65 AS_HELP_STRING([--enable-build-warnings], [enable build-time compiler warnings if gcc is used]),
66 [case "${enableval}" in
68 no) build_warnings="-w";;
69 ,*) t=`echo "${enableval}" | sed -e "s/,/ /g"`
70 build_warnings="${build_warnings} ${t}";;
71 *,) t=`echo "${enableval}" | sed -e "s/,/ /g"`
72 build_warnings="${t} ${build_warnings}";;
73 *) build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
75 if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
76 echo "Setting compiler warning flags = $build_warnings" 6>&1
78 AC_ARG_ENABLE(gdb-build-warnings,
79 AS_HELP_STRING([--enable-gdb-build-warnings], [enable GDB specific build-time compiler warnings if gcc is used]),
80 [case "${enableval}" in
82 no) build_warnings="-w";;
83 ,*) t=`echo "${enableval}" | sed -e "s/,/ /g"`
84 build_warnings="${build_warnings} ${t}";;
85 *,) t=`echo "${enableval}" | sed -e "s/,/ /g"`
86 build_warnings="${t} ${build_warnings}";;
87 *) build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
89 if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
90 echo "Setting GDB specific compiler warning flags = $build_warnings" 6>&1
93 # The set of warnings supported by a C++ compiler is not the same as
98 if test "x${build_warnings}" != x -a "x$GCC" = xyes
100 AC_MSG_CHECKING(compiler warning flags)
101 # Separate out the -Werror flag as some files just cannot be
102 # compiled with it enabled.
103 for w in ${build_warnings}; do
104 # GCC does not complain about -Wno-unknown-warning. Invert
105 # and test -Wunknown-warning instead.
108 wtest=`echo $w | sed 's/-Wno-/-W/g'` ;;
114 -Werr*) WERROR_CFLAGS=-Werror ;;
116 # Check whether GCC accepts it.
117 saved_CFLAGS="$CFLAGS"
118 CFLAGS="$CFLAGS -Werror $wtest"
119 saved_CXXFLAGS="$CXXFLAGS"
120 CXXFLAGS="$CXXFLAGS -Werror $wtest"
121 AC_TRY_COMPILE([],[],WARN_CFLAGS="${WARN_CFLAGS} $w",)
122 CFLAGS="$saved_CFLAGS"
123 CXXFLAGS="$saved_CXXFLAGS"
126 AC_MSG_RESULT(${WARN_CFLAGS} ${WERROR_CFLAGS})
128 AC_SUBST(WARN_CFLAGS)
129 AC_SUBST(WERROR_CFLAGS)