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|
# MATE_COMPILE_WARNINGS
# Turn on many useful compiler warnings
# For now, only works on GCC
#
# Copyright (C) 2011 Perberos <perberos@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
AC_DEFUN([MATE_COMPILE_WARNINGS],[
dnl ******************************
dnl More compiler warnings
dnl ******************************
m4_ifndef([AX_CHECK_COMPILE_FLAG],[
AC_MSG_ERROR([You need to install the autoconf-archive package.])
])
m4_ifndef([AX_APPEND_FLAG],[
AC_MSG_ERROR([You need to install the autoconf-archive package.])
])
AC_ARG_ENABLE(compile-warnings,
AS_HELP_STRING([--enable-compile-warnings=@<:@no/minimum/yes/maximum/error@:>@],
[Turn on compiler warnings]),,
[enable_compile_warnings="m4_default([$1],[yes])"])
AC_LANG_PUSH([C])
case "$enable_compile_warnings" in
no)
warning_flags=
;;
minimum)
warning_flags="-Wall"
;;
yes)
warning_flags="-Wall -Wmissing-prototypes"
;;
maximum|error)
warning_flags="-Wall -Wmissing-prototypes -Wbad-function-cast -Wcast-align -Wextra -Wno-unused-parameter -Wformat-nonliteral -Wmissing-declarations -Wmissing-field-initializers -Wnested-externs -Wpointer-arith -Wredundant-decls -Wshadow -Wstrict-prototypes -Werror=format-security -Wno-sign-compare"
if test "$enable_compile_warnings" = "error" ; then
warning_flags="$warning_flags -Werror"
fi
;;
*)
AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings)
;;
esac
# Always pass -Werror=unknown-warning-option to get Clang to fail on bad
# flags, otherwise they are always appended to the warn_cflags variable, and
# Clang warns on them for every compilation unit.
# If this is passed to GCC, it will explode, so the flag must be enabled
# conditionally.
AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
compiler_flags_test="-Werror=unknown-warning-option"
],[
compiler_flags_test=""
])
for flag in $warning_flags; do
AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [WARN_CFLAGS])], [], [$compiler_flags_test], [])
done
AC_MSG_CHECKING(flags to pass to the C compiler $CC)
AC_MSG_RESULT(${WARN_CFLAGS})
AC_LANG_POP([C])
AC_SUBST(WARN_CFLAGS)
])
dnl For C++, do basically the same thing.
AC_DEFUN([MATE_CXX_WARNINGS],[
m4_ifndef([AX_CHECK_COMPILE_FLAG],[
AC_MSG_ERROR([You need to install the autoconf-archive package.])
])
m4_ifndef([AX_APPEND_FLAG],[
AC_MSG_ERROR([You need to install the autoconf-archive package.])
])
AC_ARG_ENABLE(cxx-warnings,
AS_HELP_STRING([--enable-cxx-warnings=@<:@no/minimum/yes/maximum/error@:>@],
[Turn on compiler warnings.]),,
[enable_cxx_warnings="m4_default([$1],[yes])"])
AC_LANG_PUSH([C++])
case "$enable_cxx_warnings" in
no)
warning_flags=
;;
minimum)
warning_flags="-Wall"
;;
yes)
warning_flags="-Wall -Wno-unused -Woverloaded-virtual"
;;
maximum|error)
warning_flags="-Wall -Wno-unused -Woverloaded-virtual -Wextra -Wshadow -Wformat-nonliteral -Werror=format-security -Wpointer-arith -Wno-sign-compare -Wcast-align -Wmissing-declarations -Wredundant-decls"
if test "$enable_compile_warnings" = "error" ; then
warning_flags="$warning_flags -Werror"
fi
;;
*)
AC_MSG_ERROR(Unknown argument '$enable_cxx_warnings' to --enable-cxx-warnings)
;;
esac
# Always pass -Werror=unknown-warning-option to get Clang to fail on bad
# flags, otherwise they are always appended to the warn_cflags variable, and
# Clang warns on them for every compilation unit.
# If this is passed to GCC, it will explode, so the flag must be enabled
# conditionally.
AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
compiler_flags_test="-Werror=unknown-warning-option"
],[
compiler_flags_test=""
])
for flag in $warning_flags; do
AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [WARN_CXXFLAGS])], [], [$compiler_flags_test], [])
done
AC_MSG_CHECKING(what language compliance flags to pass to the C++ compiler)
AC_MSG_RESULT(${WARN_CXXFLAGS})
AC_LANG_POP([C++])
AC_SUBST(WARN_CXXFLAGS)
])
|
