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# Configure template for GNU M4. -*-Autoconf-*-
# Copyright (C) 1991, 1993-1994, 2004-2013 Free Software Foundation,
# Inc.
#
# This file is part of GNU M4.
#
# GNU M4 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.
#
# GNU M4 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_PREREQ([2.62])
AC_INIT([GNU M4], m4_esyscmd([build-aux/git-version-gen .tarball-version]),
[bug-m4@gnu.org])
AC_CONFIG_AUX_DIR([build-aux])
AM_INIT_AUTOMAKE([1.11.6 dist-bzip2 dist-xz color-tests parallel-tests
silent-rules subdir-objects gnu])
m4_pattern_forbid([^M4_[A-Z]])
AC_CONFIG_SRCDIR([src/m4.h])
AC_CONFIG_HEADERS([lib/config.h:lib/config.hin])
AC_PROG_CC
AC_DEFUN([gl_CXX_CHOICE_DEFAULT_NO])
M4_EARLY
# Maintainer note - comment this line out if you plan to rerun
# GNULIB_POSIXCHECK testing to see if M4 should be using more modules.
# Leave it uncommented for normal releases, for faster ./configure.
gl_ASSERT_NO_GNULIB_POSIXCHECK
# M4 is single-threaded; so we can optimize gnulib code by using this:
gl_DISABLE_THREADS
AC_ARG_ENABLE([gcc-warnings],
[AS_HELP_STRING([--enable-gcc-warnings],
[turn on lots of GCC warnings (for developers)])],
[case $enableval in
yes|no) ;;
*) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
esac
gl_gcc_warnings=$enableval],
[if test -d "$srcdir"/.git; then
gl_gcc_warnings=yes
else
gl_gcc_warnings=no
fi]
)
if test "$gl_gcc_warnings" = yes; then
gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
AC_SUBST([WERROR_CFLAGS])
# We use '#pragma GCC diagnostic push' to silence some
# warnings, but older gcc doesn't support this.
AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
[M4_cv_gcc_pragma_push_works], [
save_CFLAGS=$CFLAGS
CFLAGS='-Wunknown-pragmas -Werror'
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#pragma GCC diagnostic push
#pragma GCC diagnostic pop
]])],
[M4_cv_gcc_pragma_push_works=yes],
[M4_cv_gcc_pragma_push_works=no])
CFLAGS=$save_CFLAGS])
# This, $nw, is the list of warnings we disable.
nw=
nw="$nw -Waggregate-return" # K&R is anachronistic
nw="$nw -Wtraditional-conversion" # K&R is anachronistic
nw="$nw -Wundef" # K&R is anachronistic
nw="$nw -Wtraditional" # K&R is anachronistic
nw="$nw -Wlong-long" # C90 is anachronistic
nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings
nw="$nw -Wpadded" # Our structs are not packed
nw="$nw -Wconversion" # Too many warnings for now
nw="$nw -Wsign-conversion" # Too many warnings for now
nw="$nw -Wcast-qual" # Too many warnings for now
nw="$nw -Wswitch-enum" # Too many warnings for now
# gcc 4.4.6 complains enum-compare is C++ only; gcc 4.7.0 implies it in -Wall
nw="$nw -Wenum-compare"
# Gnulib uses '#pragma GCC diagnostic push' to silence some
# warnings, but older gcc doesn't support this.
AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
[M4_cv_gcc_pragma_push_works], [
save_CFLAGS=$CFLAGS
CFLAGS='-Wunknown-pragmas -Werror'
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#pragma GCC diagnostic push
#pragma GCC diagnostic pop
]])],
[M4_cv_gcc_pragma_push_works=yes],
[M4_cv_gcc_pragma_push_works=no])
CFLAGS=$save_CFLAGS])
if test $M4_cv_gcc_pragma_push_works = no; then
nw="$nw -Wmissing-prototypes"
nw="$nw -Wmissing-declarations"
nw="$nw -Wunreachable-code"
fi
gl_MANYWARN_ALL_GCC([ws])
gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
for w in $ws; do
gl_WARN_ADD([$w])
done
# Gnulib turns on -Wformat=2, which implies -Wformat-nonliteral, but
# we temporarily override it in format.c if possible.
if test $M4_cv_gcc_pragma_push_works = no; then
gl_WARN_ADD([-Wno-format-nonliteral])
fi
gl_WARN_ADD([-fdiagnostics-show-option])
gl_WARN_ADD([-funit-at-a-time])
AC_SUBST([WARN_CFLAGS])
AH_VERBATIM([FORTIFY_SOURCE],
[/* Enable compile-time and run-time bounds-checking, and some warnings,
without upsetting newer glibc. */
#if defined __OPTIMIZE__ && __OPTIMIZE__
# define _FORTIFY_SOURCE 2
#endif
])
fi
# Tandem/NSK is broken - it has 'long long int' but not
# 'unsigned long long int', which confuses assumptions made by gnulib.
# Simply pretend that neither type exists if both do not work.
AC_TYPE_LONG_LONG_INT
AC_TYPE_UNSIGNED_LONG_LONG_INT
if test $ac_cv_type_long_long_int:$ac_cv_type_unsigned_long_long_int = yes:no
then
ac_cv_type_long_long_int=no
AC_DEFINE([HAVE_LONG_LONG_INT], 0,
[Define to 1 if the system has the type `long long int'.])
fi
M4_INIT
AC_CACHE_CHECK([whether an open file can be renamed],
[M4_cv_func_rename_open_file_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[FILE *f = fopen ("conftest.1", "w+");
int result = rename ("conftest.1", "conftest.2");
fclose (f); remove ("conftest.1"); remove ("conftest.2");
return result;])],
[M4_cv_func_rename_open_file_works=yes],
[M4_cv_func_rename_open_file_works=no],
[M4_cv_func_rename_open_file_works='guessing no'])])
if test "$M4_cv_func_rename_open_file_works" = yes ; then
M4_rename_open_works=1
else
M4_rename_open_works=0
fi
AC_DEFINE_UNQUOTED([RENAME_OPEN_FILE_WORKS], [$M4_rename_open_works],
[Define to 1 if a file can be renamed while open, or to 0 if not.])
dnl Don't let changeword get in our way, if bootstrapping with a version of
dnl m4 that already turned the feature on.
m4_ifdef([changeword], [m4_undefine([changeword])])dnl
AC_MSG_CHECKING([[if changeword is wanted]])
AC_ARG_ENABLE([changeword],
[AS_HELP_STRING([--enable-changeword],
[enable -W and changeword() builtin])],
[if test "$enableval" = yes; then
AC_MSG_RESULT([yes])
AC_DEFINE([ENABLE_CHANGEWORD], [1],
[Define to 1 if the changeword(REGEXP) functionality is wanted])
else
AC_MSG_RESULT([no])
fi], [AC_MSG_RESULT([no])])
AC_MSG_CHECKING([[which shell to use for syscmd]])
AC_ARG_WITH([syscmd-shell],
[AS_HELP_STRING([--with-syscmd-shell], [shell used by syscmd [/bin/sh]])],
[case $withval in
yes[)] with_syscmd_shell=no;;
esac], [with_syscmd_shell=no])
if test "$with_syscmd_shell" = no ; then
with_syscmd_shell=/bin/sh
if test "$cross_compiling" != yes ; then
dnl Give mingw a default that is more likely to be available.
AS_IF([AS_EXECUTABLE_P([/bin/sh])], [],
[if (cmd /c) 2>/dev/null; then with_syscmd_shell=cmd; fi])
dnl Too bad _AS_PATH_WALK is not public.
M4_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for M4_dir in `if (command -p getconf PATH) 2>/dev/null ; then
command -p getconf PATH
else
echo "/bin$PATH_SEPARATOR$PATH"
fi`
do
IFS=$M4_save_IFS
test -z "$M4_dir" && continue
AS_EXECUTABLE_P(["$M4_dir/sh"]) \
&& { with_syscmd_shell=$M4_dir/sh; break; }
done
IFS=$M4_save_IFS
fi
fi
AC_MSG_RESULT([$with_syscmd_shell])
AC_DEFINE_UNQUOTED([SYSCMD_SHELL], ["$with_syscmd_shell"],
[Shell used by syscmd and esyscmd, must accept -c argument.])
M4_WITH_DMALLOC
AC_CONFIG_COMMANDS([stamp-h], [[test -z "$CONFIG_HEADERS" || date > stamp-h]])
AC_CONFIG_FILES([Makefile
doc/Makefile
lib/Makefile
src/Makefile
tests/Makefile
checks/Makefile
examples/Makefile
])
AC_OUTPUT
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