configure.ac - m4 - Git at Google

 # Configure template for GNU m4.           -*-Autoconf-*-
 # Copyright (C) 1991-1994, 2000-2002, 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/>.

 dnl We depend on autotest's ./testsuite -C.
 AC_PREREQ([2.62])

 ## ------------------------ ##
 ## Autoconf initialization. ##
 ## ------------------------ ##
 m4_define([M4_VERSION],
           m4_esyscmd([build-aux/git-version-gen .tarball-version]))
 m4_bmatch(m4_defn([M4_VERSION]), [^[0-9]], [],
           [m4_define([M4_VERSION], [1.9a])])
 AC_INIT([GNU M4], m4_defn([M4_VERSION]), [bug-m4@gnu.org])

 AC_CONFIG_SRCDIR([src/m4.h])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([ltdl/m4])
 AC_CONFIG_LIBOBJ_DIR([gnu])
 AC_CONFIG_TESTDIR([tests])
 AC_CONFIG_HEADERS([gnu/config.h:gnu/config.hin])
 AC_CONFIG_FILES([tests/m4], [chmod +x tests/m4])


 ## -------------------------- ##
 ## M4 specific configuration. ##
 ## -------------------------- ##
 dnl Autoconf recommends that packages use lowercase for their package-specific
 dnl prefix for cache variables.  But in the case of m4, that collides with
 dnl the m4_ namespace provided by m4sugar, so we prefer M4_ as our
 dnl package-specific prefix.
 m4_pattern_forbid([^M4_[A-Z]])

 AC_DEFUN([M4_DEFAULT_PRELOAD], [m4 traditional gnu])
 M4_default_preload="M4_DEFAULT_PRELOAD"


 ## ------------------------ ##
 ## Automake Initialization. ##
 ## ------------------------ ##
 AM_INIT_AUTOMAKE([1.10b subdir-objects dist-bzip2 dist-xz
 color-tests parallel-tests silent-rules]
 m4_if(m4_index(m4_defn([M4_VERSION]), [-]), [-1], [gnits], [gnu]))
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])


 ## ------------------ ##
 ## C compiler checks. ##
 ## ------------------ ##
 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

 AC_SYS_LARGEFILE
 AC_PROG_CPP
 AM_PROG_CC_C_O
 M4_CHECK_DEBUGGING


 ## ----------------------- ##
 ## Libtool initialization. ##
 ## ----------------------- ##
 LT_PREREQ([2.2])
 LT_CONFIG_LTDL_DIR([ltdl])
 LT_INIT([shared dlopen win32-dll])
 LTDL_INIT([nonrecursive])

 # The lt_dlhandle_iterate symbol was added with libtool-2.2
 if test "x$with_included_ltdl" != "xyes"; then
   save_CFLAGS="$CFLAGS"
   save_LDFLAGS="$LDFLAGS"
   CFLAGS="$CFLAGS $LTDLINCL"
   LDFLAGS="$LDFLAGS $LIBLTDL"
   AC_CHECK_LIB([ltdl], [lt_dlhandle_iterate],
              [],
      [AC_MSG_ERROR([installed libltdl is too old])])
   LDFLAGS="$save_LDFLAGS"
   CFLAGS="$save_CFLAGS"
 fi

 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],
   [gl_gcc_warnings=no]
 )

 if test "$gl_gcc_warnings" = yes; then
   gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
   AC_SUBST([WERROR_CFLAGS])

   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 -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="$nw -Wformat-nonliteral"      # Needed in builtin.c
   nw="$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
   # This, $nw, is the list of warnings we disable.

   gl_MANYWARN_ALL_GCC([ws])
   gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
   for w in $ws; do
     gl_WARN_ADD([$w])
   done

   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

 # Use gcc's -pipe option if available: for faster compilation.
 case "$CFLAGS" in
   *-pipe* ) ;;
         * ) _LT_COMPILER_OPTION([if $compiler supports -pipe],
                 [M4_cv_prog_compiler_pipe],
                 [-pipe -c conftest.$ac_ext], [],
                 [CFLAGS="$CFLAGS -pipe"])
               ;;
 esac

 ## ------------------------------- ##
 ## Preloaded module configuration. ##
 ## ------------------------------- ##
 AS_IF([test "x$enable_shared" != xno],
       [DYNAMIC_MODULES=yes], [DYNAMIC_MODULES=no])
 AC_SUBST([DYNAMIC_MODULES], [$DYNAMIC_MODULES])

 AC_MSG_CHECKING([for modules to preload])
   DLPREOPEN=

   AC_ARG_WITH([modules],
     [AS_HELP_STRING([--with-modules=MODULES],
                     [preload MODULES @<:@default: ]M4_DEFAULT_PRELOAD[@:>@])],
     [use_modules="$withval"],
     [use_modules="$M4_default_preload"])

   PREOPEN_DEPENDENCIES=
   DLPREOPEN="-dlpreopen force"
   if test -z "$use_modules"; then
     use_modules=none
   else
     if test "$use_modules" != yes; then
       for module in $use_modules; do
         case $module in
           no|none) break ;;
           m4|traditional|gnu|load|mpeval) dir=modules ;;
           import|modtest|shadow|stdlib|time) dir=tests ;;
           *) AC_MSG_ERROR([Unrecognized module `$module' in --with-modules])
             ;;
         esac
         DLPREOPEN="$DLPREOPEN -dlpreopen $dir/$module.la"
         PREOPEN_DEPENDENCIES="$PREOPEN_DEPENDENCIES $dir/$module.la"
       done
     fi
   fi
 AC_MSG_RESULT([$use_modules])
 AC_SUBST([DLPREOPEN])
 AC_SUBST([PREOPEN_DEPENDENCIES])


 ## ---------------- ##
 ## Gettext support. ##
 ## ---------------- ##
 AM_GNU_GETTEXT([external], [need-formatstring-macros])
 AM_GNU_GETTEXT_VERSION([0.16])
 M4_GNU_GETTEXT


 ## --------------- ##
 ## Gnulib support. ##
 ## --------------- ##
 M4_INIT

 gl_VERSION_ETC

 # Gnulib doesn't always do things quite the way M4 would like...
 M4_ERROR
 M4_GETOPT
 M4_OBSTACK
 M4_REGEX
 M4_RENAME


 ## ------------------------ ##
 ## Other external programs. ##
 ## ------------------------ ##
 AC_PATH_PROG([PERL], [perl])


 ## --------------------------- ##
 ## C compiler characteristics. ##
 ## --------------------------- ##
 AC_TYPE_SIZE_T
 AC_CHECK_SIZEOF([long long int])


 ## ------------------------- ##
 ## C headers required by M4. ##
 ## ------------------------- ##
 AC_CHECK_HEADERS_ONCE([limits.h])

 if test $ac_cv_header_stdbool_h = yes; then
   INCLUDE_STDBOOL_H='#include <stdbool.h>'
 else
   INCLUDE_STDBOOL_H='#include <gnu/stdbool.h>'
 fi
 AC_SUBST([INCLUDE_STDBOOL_H])


 ## --------------------------------- ##
 ## Library functions required by M4. ##
 ## --------------------------------- ##
 AC_CHECK_FUNCS_ONCE([calloc strerror])

 AM_WITH_DMALLOC

 M4_SYS_STACKOVF

 # This is for the modules
 AC_STRUCT_TM
 AC_FUNC_STRFTIME
 AC_CHECK_FUNCS_ONCE([getcwd gethostname mktime uname])


 ## ------------------ ##
 ## Configure options. ##
 ## ------------------ ##

 M4_LIB_GMP
 AM_CONDITIONAL([USE_GMP], [test "x$USE_GMP" = xyes])
 M4_SYSCMD


 ## -------- ##
 ## Outputs. ##
 ## -------- ##
 AC_CONFIG_FILES([
 Makefile
 gnu/Makefile
 doc/Makefile
 m4/system.h:m4/system_.h
 tests/atlocal
 tests/gnu/Makefile
 ])

 AC_OUTPUT
	# Configure template for GNU m4. --Autoconf--
	# Copyright (C) 1991-1994, 2000-2002, 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/>.

	dnl We depend on autotest's ./testsuite -C.
	AC_PREREQ([2.62])

	## ------------------------ ##
	## Autoconf initialization. ##
	## ------------------------ ##
	m4_define([M4_VERSION],
	m4_esyscmd([build-aux/git-version-gen .tarball-version]))
	m4_bmatch(m4_defn([M4_VERSION]), [^[0-9]], [],
	[m4_define([M4_VERSION], [1.9a])])
	AC_INIT([GNU M4], m4_defn([M4_VERSION]), [bug-m4@gnu.org])

	AC_CONFIG_SRCDIR([src/m4.h])
	AC_CONFIG_AUX_DIR([build-aux])
	AC_CONFIG_MACRO_DIR([ltdl/m4])
	AC_CONFIG_LIBOBJ_DIR([gnu])
	AC_CONFIG_TESTDIR([tests])
	AC_CONFIG_HEADERS([gnu/config.h:gnu/config.hin])
	AC_CONFIG_FILES([tests/m4], [chmod +x tests/m4])


	## -------------------------- ##
	## M4 specific configuration. ##
	## -------------------------- ##
	dnl Autoconf recommends that packages use lowercase for their package-specific
	dnl prefix for cache variables. But in the case of m4, that collides with
	dnl the m4_ namespace provided by m4sugar, so we prefer M4_ as our
	dnl package-specific prefix.
	m4_pattern_forbid([^M4_[A-Z]])

	AC_DEFUN([M4_DEFAULT_PRELOAD], [m4 traditional gnu])
	M4_default_preload="M4_DEFAULT_PRELOAD"


	## ------------------------ ##
	## Automake Initialization. ##
	## ------------------------ ##
	AM_INIT_AUTOMAKE([1.10b subdir-objects dist-bzip2 dist-xz
	color-tests parallel-tests silent-rules]
	m4_if(m4_index(m4_defn([M4_VERSION]), [-]), [-1], [gnits], [gnu]))
	m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])


	## ------------------ ##
	## C compiler checks. ##
	## ------------------ ##
	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

	AC_SYS_LARGEFILE
	AC_PROG_CPP
	AM_PROG_CC_C_O
	M4_CHECK_DEBUGGING


	## ----------------------- ##
	## Libtool initialization. ##
	## ----------------------- ##
	LT_PREREQ([2.2])
	LT_CONFIG_LTDL_DIR([ltdl])
	LT_INIT([shared dlopen win32-dll])
	LTDL_INIT([nonrecursive])

	# The lt_dlhandle_iterate symbol was added with libtool-2.2
	if test "x$with_included_ltdl" != "xyes"; then
	save_CFLAGS="$CFLAGS"
	save_LDFLAGS="$LDFLAGS"
	CFLAGS="$CFLAGS $LTDLINCL"
	LDFLAGS="$LDFLAGS $LIBLTDL"
	AC_CHECK_LIB([ltdl], [lt_dlhandle_iterate],
	[],
	[AC_MSG_ERROR([installed libltdl is too old])])
	LDFLAGS="$save_LDFLAGS"
	CFLAGS="$save_CFLAGS"
	fi

	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],
	[gl_gcc_warnings=no]
	)

	if test "$gl_gcc_warnings" = yes; then
	gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
	AC_SUBST([WERROR_CFLAGS])

	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 -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="$nw -Wformat-nonliteral" # Needed in builtin.c
	nw="$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
	# This, $nw, is the list of warnings we disable.

	gl_MANYWARN_ALL_GCC([ws])
	gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
	for w in $ws; do
	gl_WARN_ADD([$w])
	done

	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

	# Use gcc's -pipe option if available: for faster compilation.
	case "$CFLAGS" in
	-pipe ) ;;
	* ) _LT_COMPILER_OPTION([if $compiler supports -pipe],
	[M4_cv_prog_compiler_pipe],
	[-pipe -c conftest.$ac_ext], [],
	[CFLAGS="$CFLAGS -pipe"])
	;;
	esac

	## ------------------------------- ##
	## Preloaded module configuration. ##
	## ------------------------------- ##
	AS_IF([test "x$enable_shared" != xno],
	[DYNAMIC_MODULES=yes], [DYNAMIC_MODULES=no])
	AC_SUBST([DYNAMIC_MODULES], [$DYNAMIC_MODULES])

	AC_MSG_CHECKING([for modules to preload])
	DLPREOPEN=

	AC_ARG_WITH([modules],
	[AS_HELP_STRING([--with-modules=MODULES],
	[preload MODULES @<:@default: ]M4_DEFAULT_PRELOAD[@:>@])],
	[use_modules="$withval"],
	[use_modules="$M4_default_preload"])

	PREOPEN_DEPENDENCIES=
	DLPREOPEN="-dlpreopen force"
	if test -z "$use_modules"; then
	use_modules=none
	else
	if test "$use_modules" != yes; then
	for module in $use_modules; do
	case $module in
	no\|none) break ;;
	m4\|traditional\|gnu\|load\|mpeval) dir=modules ;;
	import\|modtest\|shadow\|stdlib\|time) dir=tests ;;
	*) AC_MSG_ERROR([Unrecognized module `$module' in --with-modules])
	;;
	esac
	DLPREOPEN="$DLPREOPEN -dlpreopen $dir/$module.la"
	PREOPEN_DEPENDENCIES="$PREOPEN_DEPENDENCIES $dir/$module.la"
	done
	fi
	fi
	AC_MSG_RESULT([$use_modules])
	AC_SUBST([DLPREOPEN])
	AC_SUBST([PREOPEN_DEPENDENCIES])


	## ---------------- ##
	## Gettext support. ##
	## ---------------- ##
	AM_GNU_GETTEXT([external], [need-formatstring-macros])
	AM_GNU_GETTEXT_VERSION([0.16])
	M4_GNU_GETTEXT



	## --------------- ##
	## Gnulib support. ##
	## --------------- ##
	M4_INIT

	gl_VERSION_ETC

	# Gnulib doesn't always do things quite the way M4 would like...
	M4_ERROR
	M4_GETOPT
	M4_OBSTACK
	M4_REGEX
	M4_RENAME


	## ------------------------ ##
	## Other external programs. ##
	## ------------------------ ##
	AC_PATH_PROG([PERL], [perl])



	## --------------------------- ##
	## C compiler characteristics. ##
	## --------------------------- ##
	AC_TYPE_SIZE_T
	AC_CHECK_SIZEOF([long long int])



	## ------------------------- ##
	## C headers required by M4. ##
	## ------------------------- ##
	AC_CHECK_HEADERS_ONCE([limits.h])

	if test $ac_cv_header_stdbool_h = yes; then
	INCLUDE_STDBOOL_H='#include <stdbool.h>'
	else
	INCLUDE_STDBOOL_H='#include <gnu/stdbool.h>'
	fi
	AC_SUBST([INCLUDE_STDBOOL_H])



	## --------------------------------- ##
	## Library functions required by M4. ##
	## --------------------------------- ##
	AC_CHECK_FUNCS_ONCE([calloc strerror])

	AM_WITH_DMALLOC

	M4_SYS_STACKOVF

	# This is for the modules
	AC_STRUCT_TM
	AC_FUNC_STRFTIME
	AC_CHECK_FUNCS_ONCE([getcwd gethostname mktime uname])


	## ------------------ ##
	## Configure options. ##
	## ------------------ ##

	M4_LIB_GMP
	AM_CONDITIONAL([USE_GMP], [test "x$USE_GMP" = xyes])
	M4_SYSCMD


	## -------- ##
	## Outputs. ##
	## -------- ##
	AC_CONFIG_FILES([
	Makefile
	gnu/Makefile
	doc/Makefile
	m4/system.h:m4/system_.h
	tests/atlocal
	tests/gnu/Makefile
	])

	AC_OUTPUT