1 # Configure template for GNU M4. -*-Autoconf-*-
2 # Copyright (C) 1991, 1993-1994, 2004-2014, 2016-2017, 2020-2021 Free
3 # Software Foundation, Inc.
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 <https://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:
45 AC_DEFINE([GNULIB_REGEX_SINGLE_THREAD], [1], [Define to optimize regex.])
46 AC_DEFINE([GNULIB_MBRTOWC_SINGLE_THREAD], [1], [Define to optimize mbrtowc.])
47 AC_DEFINE([GNULIB_WCHAR_SINGLE_LOCALE], [1], [Define to optimize mbrtowc.])
49 AC_ARG_ENABLE([gcc-warnings],
50 [AS_HELP_STRING([--enable-gcc-warnings],
51 [turn on lots of GCC warnings (for developers)])],
54 *) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
56 gl_gcc_warnings=$enableval],
57 [if test -f "$srcdir"/.tarball-version; then
64 if test "$gl_gcc_warnings" = yes; then
65 gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
66 AC_SUBST([WERROR_CFLAGS])
68 # We use '#pragma GCC diagnostic push' to silence some
69 # warnings, but older gcc doesn't support this.
70 AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
71 [M4_cv_gcc_pragma_push_works], [
73 CFLAGS='-Wunknown-pragmas -Werror'
74 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
75 #pragma GCC diagnostic push
76 #pragma GCC diagnostic pop
78 [M4_cv_gcc_pragma_push_works=yes],
79 [M4_cv_gcc_pragma_push_works=no])
82 # This, $nw, is the list of warnings we disable.
84 nw="$nw -Waggregate-return" # K&R is anachronistic
85 nw="$nw -Wtraditional-conversion" # K&R is anachronistic
86 nw="$nw -Wundef" # K&R is anachronistic
87 nw="$nw -Wtraditional" # K&R is anachronistic
88 nw="$nw -Wlong-long" # C90 is anachronistic
89 nw="$nw -Wvla" # gettext's use of VLAs is safe
90 nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings
91 nw="$nw -Wpadded" # Our structs are not packed
92 nw="$nw -Wconversion" # Too many warnings for now
93 nw="$nw -Wsign-conversion" # Too many warnings for now
94 nw="$nw -Wcast-qual" # Too many warnings for now
95 nw="$nw -Wswitch-enum" # Too many warnings for now
96 # gcc 4.4.6 complains enum-compare is C++ only; gcc 4.7.0 implies it in -Wall
97 nw="$nw -Wenum-compare"
99 # Gnulib uses '#pragma GCC diagnostic push' to silence some
100 # warnings, but older gcc doesn't support this.
101 AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
102 [M4_cv_gcc_pragma_push_works], [
104 CFLAGS='-Wunknown-pragmas -Werror'
105 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
106 #pragma GCC diagnostic push
107 #pragma GCC diagnostic pop
109 [M4_cv_gcc_pragma_push_works=yes],
110 [M4_cv_gcc_pragma_push_works=no])
111 CFLAGS=$save_CFLAGS])
112 if test $M4_cv_gcc_pragma_push_works = no; then
113 nw="$nw -Wmissing-prototypes"
114 nw="$nw -Wmissing-declarations"
115 nw="$nw -Wunreachable-code"
118 gl_MANYWARN_ALL_GCC([ws])
119 gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
124 # Gnulib turns on -Wformat=2, which implies -Wformat-nonliteral, but
125 # we temporarily override it in format.c if possible.
126 if test $M4_cv_gcc_pragma_push_works = no; then
127 gl_WARN_ADD([-Wno-format-nonliteral])
130 AC_SUBST([WARN_CFLAGS])
132 AH_VERBATIM([FORTIFY_SOURCE],
133 [/* Enable compile-time and run-time bounds-checking, and some warnings,
134 without upsetting newer glibc. */
135 #if defined __OPTIMIZE__ && __OPTIMIZE__
136 # define _FORTIFY_SOURCE 2
141 # Tandem/NSK is broken - it has 'long long int' but not
142 # 'unsigned long long int', which confuses assumptions made by gnulib.
143 # Simply pretend that neither type exists if both do not work.
144 AC_TYPE_LONG_LONG_INT
145 AC_TYPE_UNSIGNED_LONG_LONG_INT
146 if test $ac_cv_type_long_long_int:$ac_cv_type_unsigned_long_long_int = yes:no
148 ac_cv_type_long_long_int=no
149 AC_DEFINE([HAVE_LONG_LONG_INT], 0,
150 [Define to 1 if the system has the type `long long int'.])
155 AC_CACHE_CHECK([whether an open file can be renamed],
156 [M4_cv_func_rename_open_file_works],
157 [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
158 [FILE *f = fopen ("conftest.1", "w+");
159 int result = rename ("conftest.1", "conftest.2");
160 fclose (f); remove ("conftest.1"); remove ("conftest.2");
162 [M4_cv_func_rename_open_file_works=yes],
163 [M4_cv_func_rename_open_file_works=no],
164 [M4_cv_func_rename_open_file_works='guessing no'])])
165 if test "$M4_cv_func_rename_open_file_works" = yes ; then
166 M4_rename_open_works=1
168 M4_rename_open_works=0
170 AC_DEFINE_UNQUOTED([RENAME_OPEN_FILE_WORKS], [$M4_rename_open_works],
171 [Define to 1 if a file can be renamed while open, or to 0 if not.])
173 dnl Don't let changeword get in our way, if bootstrapping with a version of
174 dnl m4 that already turned the feature on.
175 m4_ifdef([changeword], [m4_undefine([changeword])])dnl
177 AC_MSG_CHECKING([[if changeword is wanted]])
178 AC_ARG_ENABLE([changeword],
179 [AS_HELP_STRING([--enable-changeword],
180 [enable -W and changeword() builtin])],
181 [if test "$enableval" = yes; then
183 AC_DEFINE([ENABLE_CHANGEWORD], [1],
184 [Define to 1 if the changeword(REGEXP) functionality is wanted])
187 fi], [AC_MSG_RESULT([no])])
189 AC_MSG_CHECKING([[which shell to use for syscmd]])
190 AC_ARG_WITH([syscmd-shell],
191 [AS_HELP_STRING([--with-syscmd-shell], [shell used by syscmd [/bin/sh]])],
193 yes[)] with_syscmd_shell=no;;
194 esac], [with_syscmd_shell=no])
195 if test "$with_syscmd_shell" = no ; then
196 with_syscmd_shell=/bin/sh
197 if test "$cross_compiling" != yes ; then
198 dnl Give mingw a default that is more likely to be available.
199 AS_IF([AS_EXECUTABLE_P([/bin/sh$EXEEXT])], [],
200 [if (cmd /c) 2>/dev/null; then with_syscmd_shell=cmd; fi])
201 dnl Too bad _AS_PATH_WALK is not public.
202 M4_save_IFS=$IFS; IFS=$PATH_SEPARATOR
203 for M4_dir in `if (command -p getconf PATH) 2>/dev/null ; then
204 command -p getconf PATH
206 echo "/bin$PATH_SEPARATOR$PATH"
210 test -z "$M4_dir" && continue
211 AS_EXECUTABLE_P(["$M4_dir/sh"]) \
212 && { with_syscmd_shell=$M4_dir/sh; break; }
217 AC_MSG_RESULT([$with_syscmd_shell])
218 AC_DEFINE_UNQUOTED([SYSCMD_SHELL], ["$with_syscmd_shell"],
219 [Shell used by syscmd and esyscmd, must accept -c argument.])
223 AC_CONFIG_COMMANDS([stamp-h], [[test -z "$CONFIG_HEADERS" || date > stamp-h]])
225 AS_CASE([$host], [*-*-os2*], [OS2_LDFLAGS="-Zargs-resp"])
226 AC_SUBST([OS2_LDFLAGS])
228 AM_GNU_GETTEXT([external], [need-formatstring-macros])
229 AM_GNU_GETTEXT_VERSION([0.19.2])
231 AC_CONFIG_FILES([Makefile