1 # Configure template for GNU M4. -*-Autoconf-*-
2 # Copyright (C) 1991, 1993-1994, 2004-2014, 2016 Free Software
5 # This file is part of GNU M4.
7 # GNU M4 is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
12 # GNU M4 is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
21 AC_INIT([GNU M4], m4_esyscmd([build-aux/git-version-gen .tarball-version]),
23 AC_CONFIG_AUX_DIR([build-aux])
25 AM_INIT_AUTOMAKE([1.11.6 dist-bzip2 dist-xz color-tests parallel-tests
26 silent-rules subdir-objects gnu])
27 AM_SILENT_RULES([yes]) # make --enable-silent-rules the default.
29 m4_pattern_forbid([^M4_[A-Z]])
31 AC_CONFIG_SRCDIR([src/m4.h])
32 AC_CONFIG_HEADERS([lib/config.h:lib/config.hin])
35 AC_DEFUN([gl_CXX_CHOICE_DEFAULT_NO])
38 # Maintainer note - comment this line out if you plan to rerun
39 # GNULIB_POSIXCHECK testing to see if M4 should be using more modules.
40 # Leave it uncommented for normal releases, for faster ./configure.
41 gl_ASSERT_NO_GNULIB_POSIXCHECK
43 # M4 is single-threaded; so we can optimize gnulib code by using this:
46 AC_ARG_ENABLE([gcc-warnings],
47 [AS_HELP_STRING([--enable-gcc-warnings],
48 [turn on lots of GCC warnings (for developers)])],
51 *) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
53 gl_gcc_warnings=$enableval],
54 [if test -f "$srcdir"/.tarball-version; then
61 if test "$gl_gcc_warnings" = yes; then
62 gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
63 AC_SUBST([WERROR_CFLAGS])
65 # We use '#pragma GCC diagnostic push' to silence some
66 # warnings, but older gcc doesn't support this.
67 AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
68 [M4_cv_gcc_pragma_push_works], [
70 CFLAGS='-Wunknown-pragmas -Werror'
71 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
72 #pragma GCC diagnostic push
73 #pragma GCC diagnostic pop
75 [M4_cv_gcc_pragma_push_works=yes],
76 [M4_cv_gcc_pragma_push_works=no])
79 # This, $nw, is the list of warnings we disable.
81 nw="$nw -Waggregate-return" # K&R is anachronistic
82 nw="$nw -Wtraditional-conversion" # K&R is anachronistic
83 nw="$nw -Wundef" # K&R is anachronistic
84 nw="$nw -Wtraditional" # K&R is anachronistic
85 nw="$nw -Wlong-long" # C90 is anachronistic
86 nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings
87 nw="$nw -Wpadded" # Our structs are not packed
88 nw="$nw -Wconversion" # Too many warnings for now
89 nw="$nw -Wsign-conversion" # Too many warnings for now
90 nw="$nw -Wcast-qual" # Too many warnings for now
91 nw="$nw -Wswitch-enum" # Too many warnings for now
92 # gcc 4.4.6 complains enum-compare is C++ only; gcc 4.7.0 implies it in -Wall
93 nw="$nw -Wenum-compare"
95 # Gnulib uses '#pragma GCC diagnostic push' to silence some
96 # warnings, but older gcc doesn't support this.
97 AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
98 [M4_cv_gcc_pragma_push_works], [
100 CFLAGS='-Wunknown-pragmas -Werror'
101 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
102 #pragma GCC diagnostic push
103 #pragma GCC diagnostic pop
105 [M4_cv_gcc_pragma_push_works=yes],
106 [M4_cv_gcc_pragma_push_works=no])
107 CFLAGS=$save_CFLAGS])
108 if test $M4_cv_gcc_pragma_push_works = no; then
109 nw="$nw -Wmissing-prototypes"
110 nw="$nw -Wmissing-declarations"
111 nw="$nw -Wunreachable-code"
114 gl_MANYWARN_ALL_GCC([ws])
115 gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
120 # Gnulib turns on -Wformat=2, which implies -Wformat-nonliteral, but
121 # we temporarily override it in format.c if possible.
122 if test $M4_cv_gcc_pragma_push_works = no; then
123 gl_WARN_ADD([-Wno-format-nonliteral])
126 AC_SUBST([WARN_CFLAGS])
128 AH_VERBATIM([FORTIFY_SOURCE],
129 [/* Enable compile-time and run-time bounds-checking, and some warnings,
130 without upsetting newer glibc. */
131 #if defined __OPTIMIZE__ && __OPTIMIZE__
132 # define _FORTIFY_SOURCE 2
137 # Tandem/NSK is broken - it has 'long long int' but not
138 # 'unsigned long long int', which confuses assumptions made by gnulib.
139 # Simply pretend that neither type exists if both do not work.
140 AC_TYPE_LONG_LONG_INT
141 AC_TYPE_UNSIGNED_LONG_LONG_INT
142 if test $ac_cv_type_long_long_int:$ac_cv_type_unsigned_long_long_int = yes:no
144 ac_cv_type_long_long_int=no
145 AC_DEFINE([HAVE_LONG_LONG_INT], 0,
146 [Define to 1 if the system has the type `long long int'.])
151 AC_CACHE_CHECK([whether an open file can be renamed],
152 [M4_cv_func_rename_open_file_works],
153 [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
154 [FILE *f = fopen ("conftest.1", "w+");
155 int result = rename ("conftest.1", "conftest.2");
156 fclose (f); remove ("conftest.1"); remove ("conftest.2");
158 [M4_cv_func_rename_open_file_works=yes],
159 [M4_cv_func_rename_open_file_works=no],
160 [M4_cv_func_rename_open_file_works='guessing no'])])
161 if test "$M4_cv_func_rename_open_file_works" = yes ; then
162 M4_rename_open_works=1
164 M4_rename_open_works=0
166 AC_DEFINE_UNQUOTED([RENAME_OPEN_FILE_WORKS], [$M4_rename_open_works],
167 [Define to 1 if a file can be renamed while open, or to 0 if not.])
169 dnl Don't let changeword get in our way, if bootstrapping with a version of
170 dnl m4 that already turned the feature on.
171 m4_ifdef([changeword], [m4_undefine([changeword])])dnl
173 AC_MSG_CHECKING([[if changeword is wanted]])
174 AC_ARG_ENABLE([changeword],
175 [AS_HELP_STRING([--enable-changeword],
176 [enable -W and changeword() builtin])],
177 [if test "$enableval" = yes; then
179 AC_DEFINE([ENABLE_CHANGEWORD], [1],
180 [Define to 1 if the changeword(REGEXP) functionality is wanted])
183 fi], [AC_MSG_RESULT([no])])
185 AC_MSG_CHECKING([[which shell to use for syscmd]])
186 AC_ARG_WITH([syscmd-shell],
187 [AS_HELP_STRING([--with-syscmd-shell], [shell used by syscmd [/bin/sh]])],
189 yes[)] with_syscmd_shell=no;;
190 esac], [with_syscmd_shell=no])
191 if test "$with_syscmd_shell" = no ; then
192 with_syscmd_shell=/bin/sh
193 if test "$cross_compiling" != yes ; then
194 dnl Give mingw a default that is more likely to be available.
195 AS_IF([AS_EXECUTABLE_P([/bin/sh$EXEEXT])], [],
196 [if (cmd /c) 2>/dev/null; then with_syscmd_shell=cmd; fi])
197 dnl Too bad _AS_PATH_WALK is not public.
198 M4_save_IFS=$IFS; IFS=$PATH_SEPARATOR
199 for M4_dir in `if (command -p getconf PATH) 2>/dev/null ; then
200 command -p getconf PATH
202 echo "/bin$PATH_SEPARATOR$PATH"
206 test -z "$M4_dir" && continue
207 AS_EXECUTABLE_P(["$M4_dir/sh"]) \
208 && { with_syscmd_shell=$M4_dir/sh; break; }
213 AC_MSG_RESULT([$with_syscmd_shell])
214 AC_DEFINE_UNQUOTED([SYSCMD_SHELL], ["$with_syscmd_shell"],
215 [Shell used by syscmd and esyscmd, must accept -c argument.])
219 AC_CONFIG_COMMANDS([stamp-h], [[test -z "$CONFIG_HEADERS" || date > stamp-h]])
221 AS_CASE([$host], [*-*-os2*], [OS2_LDFLAGS="-Zargs-resp"])
222 AC_SUBST([OS2_LDFLAGS])
224 AC_CONFIG_FILES([Makefile