m4/ax_prefix_config_h.m4 - platform/external/ImageMagick - Gitiles

 # ===========================================================================
 #    https://www.gnu.org/software/autoconf-archive/ax_prefix_config_h.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
 #
 # DESCRIPTION
 #
 #   Generate an installable config.h.
 #
 #   A package should not normally install its config.h as a system header,
 #   but if it must, this macro can be used to avoid namespace pollution by
 #   making a copy of config.h with a prefix added to all the macro names.
 #
 #   Each "#define SOMEDEF" line of the configuration header has the given
 #   prefix added, in the same case as the first character of the macro name.
 #
 #   Defaults:
 #
 #     OUTPUT-HEADER = $PACKAGE-config.h
 #     PREFIX = $PACKAGE
 #     ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
 #
 #   Your configure.ac script should contain both macros in this order.
 #
 #   Example:
 #
 #     AC_INIT(config.h.in)        # config.h.in as created by "autoheader"
 #     AM_INIT_AUTOMAKE(testpkg, 0.1.1)    # makes #undef VERSION and PACKAGE
 #     AM_CONFIG_HEADER(config.h)          # prep config.h from config.h.in
 #     AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
 #     AC_MEMORY_H                         # makes "#undef NEED_MEMORY_H"
 #     AC_C_CONST_H                        # makes "#undef const"
 #     AC_OUTPUT(Makefile)                 # creates the "config.h" now
 #                                         # and also mylib/_config.h
 #
 #   If the argument to AX_PREFIX_CONFIG_H would have been omitted then the
 #   default output file would have been called simply "testpkg-config.h",
 #   but even under the name "mylib/_config.h" it contains prefix-defines
 #   like
 #
 #     #ifndef TESTPKG_VERSION
 #     #define TESTPKG_VERSION "0.1.1"
 #     #endif
 #     #ifndef TESTPKG_NEED_MEMORY_H
 #     #define TESTPKG_NEED_MEMORY_H 1
 #     #endif
 #     #ifndef _testpkg_const
 #     #define _testpkg_const _const
 #     #endif
 #
 #   and this "mylib/_config.h" can be installed along with other header
 #   files, which is most convenient when creating a shared library (that has
 #   some headers) whose functionality depends on features detected at
 #   compile-time. No need to invent some "mylib-confdefs.h.in" manually.
 #
 #   Note that some AC_DEFINEs that end up in the config.h file are actually
 #   self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the AC_TYPE_OFF_T
 #   say that they "will define inline|const|off_t if the system does not do
 #   it by itself". You might want to clean up about these - consider an
 #   extra mylib/conf.h that reads something like:
 #
 #     #include <mylib/_config.h>
 #     #ifndef _testpkg_const
 #     #define _testpkg_const const
 #     #endif
 #
 #   and then start using _testpkg_const in the header files. That is also a
 #   good thing to differentiate whether some library-user has starting to
 #   take up with a different compiler, so perhaps it could read something
 #   like this:
 #
 #     #ifdef _MSC_VER
 #     #include <mylib/_msvc.h>
 #     #else
 #     #include <mylib/_config.h>
 #     #endif
 #     #ifndef _testpkg_const
 #     #define _testpkg_const const
 #     #endif
 #
 # LICENSE
 #
 #   Copyright (c) 2014 Reuben Thomas <rrt@sc3d.org>
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2008 Marten Svantesson
 #   Copyright (c) 2008 Gerald Point <Gerald.Point@labri.fr>
 #
 #   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 <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
 #   or distributing such scripts, even though portions of the text of the
 #   Macro appear in them. The GNU General Public License (GPL) does govern
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
 #   Macro released by the Autoconf Archive. When you make and distribute a
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.

 #serial 16

 AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl
 AC_PREREQ([2.62])
 AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl
 AC_CONFIG_COMMANDS(m4_default([$1], [$PACKAGE-config.h]),[dnl
 AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl
 AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl
 AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl
 AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl
 AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl
 AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl
 m4_pushdef([_script],[conftest.prefix])dnl
 m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl
 _OUT=`echo m4_default([$1], [$PACKAGE-config.h])`
 _DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"`
 _PKG=`echo m4_default([$2], [$PACKAGE])`
 _LOW=`echo _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"`
 _UPP=`echo $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:"  -e "/^@<:@m4_cr_digits@:>@/s/^/_/"`
 _INP=`echo "$3" | sed -e 's/ *//'`
 if test ".$_INP" = "."; then
    for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue
      case "$ac_file" in
         *.h) _INP=$ac_file ;;
         *)
      esac
      test ".$_INP" != "." && break
    done
 fi
 if test ".$_INP" = "."; then
    case "$_OUT" in
       */*) _INP=`basename "$_OUT"`
       ;;
       *-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"`
       ;;
       *) _INP=config.h
       ;;
    esac
 fi
 if test -z "$_PKG" ; then
    AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
 else
   if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then
      _INP="$srcdir/$_INP"
   fi fi
   AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines)
   if test -f $_INP ; then
     AS_ECHO(["s/^@%:@undef  *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/"]) > _script
     AS_ECHO(["s/^@%:@undef  *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/"]) >> _script
     AS_ECHO(["s/^@%:@def[]ine  *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1\\"]) >> _script
     AS_ECHO(["@%:@def[]ine $_UPP""_\\1\\2\\"]) >> _script
     AS_ECHO(["@%:@endif/"]) >> _script
     AS_ECHO(["s/^@%:@def[]ine  *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1\\"]) >> _script
     AS_ECHO(["@%:@define $_LOW""_\\1\\2\\"]) >> _script
     AS_ECHO(["@%:@endif/"]) >> _script
     # now executing _script on _DEF input to create _OUT output file
     echo "@%:@ifndef $_DEF"      >$tmp/pconfig.h
     echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h
     echo ' ' >>$tmp/pconfig.h
     echo /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h

     sed -f _script $_INP >>$tmp/pconfig.h
     echo ' ' >>$tmp/pconfig.h
     echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h
     echo "@%:@endif" >>$tmp/pconfig.h
     if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then
       AC_MSG_NOTICE([$_OUT is unchanged])
     else
       ac_dir=`AS_DIRNAME(["$_OUT"])`
       AS_MKDIR_P(["$ac_dir"])
       rm -f "$_OUT"
       mv $tmp/pconfig.h "$_OUT"
     fi
   else
     AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
   fi
   rm -f conftest.*
 fi
 m4_popdef([_symbol])dnl
 m4_popdef([_script])dnl
 AS_VAR_POPDEF([_INP])dnl
 AS_VAR_POPDEF([_UPP])dnl
 AS_VAR_POPDEF([_LOW])dnl
 AS_VAR_POPDEF([_PKG])dnl
 AS_VAR_POPDEF([_DEF])dnl
 AS_VAR_POPDEF([_OUT])dnl
 ],[PACKAGE="$PACKAGE"])])
	# ===========================================================================
	# https://www.gnu.org/software/autoconf-archive/ax_prefix_config_h.html
	# ===========================================================================
	#
	# SYNOPSIS
	#
	# AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
	#
	# DESCRIPTION
	#
	# Generate an installable config.h.
	#
	# A package should not normally install its config.h as a system header,
	# but if it must, this macro can be used to avoid namespace pollution by
	# making a copy of config.h with a prefix added to all the macro names.
	#
	# Each "#define SOMEDEF" line of the configuration header has the given
	# prefix added, in the same case as the first character of the macro name.
	#
	# Defaults:
	#
	# OUTPUT-HEADER = $PACKAGE-config.h
	# PREFIX = $PACKAGE
	# ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
	#
	# Your configure.ac script should contain both macros in this order.
	#
	# Example:
	#
	# AC_INIT(config.h.in) # config.h.in as created by "autoheader"
	# AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE
	# AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in
	# AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
	# AC_MEMORY_H # makes "#undef NEED_MEMORY_H"
	# AC_C_CONST_H # makes "#undef const"
	# AC_OUTPUT(Makefile) # creates the "config.h" now
	# # and also mylib/_config.h
	#
	# If the argument to AX_PREFIX_CONFIG_H would have been omitted then the
	# default output file would have been called simply "testpkg-config.h",
	# but even under the name "mylib/_config.h" it contains prefix-defines
	# like
	#
	# #ifndef TESTPKG_VERSION
	# #define TESTPKG_VERSION "0.1.1"
	# #endif
	# #ifndef TESTPKG_NEED_MEMORY_H
	# #define TESTPKG_NEED_MEMORY_H 1
	# #endif
	# #ifndef _testpkg_const
	# #define _testpkg_const _const
	# #endif
	#
	# and this "mylib/_config.h" can be installed along with other header
	# files, which is most convenient when creating a shared library (that has
	# some headers) whose functionality depends on features detected at
	# compile-time. No need to invent some "mylib-confdefs.h.in" manually.
	#
	# Note that some AC_DEFINEs that end up in the config.h file are actually
	# self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the AC_TYPE_OFF_T
	# say that they "will define inline\|const\|off_t if the system does not do
	# it by itself". You might want to clean up about these - consider an
	# extra mylib/conf.h that reads something like:
	#
	# #include <mylib/_config.h>
	# #ifndef _testpkg_const
	# #define _testpkg_const const
	# #endif
	#
	# and then start using _testpkg_const in the header files. That is also a
	# good thing to differentiate whether some library-user has starting to
	# take up with a different compiler, so perhaps it could read something
	# like this:
	#
	# #ifdef _MSC_VER
	# #include <mylib/_msvc.h>
	# #else
	# #include <mylib/_config.h>
	# #endif
	# #ifndef _testpkg_const
	# #define _testpkg_const const
	# #endif
	#
	# LICENSE
	#
	# Copyright (c) 2014 Reuben Thomas <rrt@sc3d.org>
	# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
	# Copyright (c) 2008 Marten Svantesson
	# Copyright (c) 2008 Gerald Point <Gerald.Point@labri.fr>
	#
	# 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 <https://www.gnu.org/licenses/>.
	#
	# As a special exception, the respective Autoconf Macro's copyright owner
	# gives unlimited permission to copy, distribute and modify the configure
	# scripts that are the output of Autoconf when processing the Macro. You
	# need not follow the terms of the GNU General Public License when using
	# or distributing such scripts, even though portions of the text of the
	# Macro appear in them. The GNU General Public License (GPL) does govern
	# all other use of the material that constitutes the Autoconf Macro.
	#
	# This special exception to the GPL applies to versions of the Autoconf
	# Macro released by the Autoconf Archive. When you make and distribute a
	# modified version of the Autoconf Macro, you may extend this special
	# exception to the GPL to apply to your modified version as well.

	#serial 16

	AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl
	AC_PREREQ([2.62])
	AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl
	AC_CONFIG_COMMANDS(m4_default([$1], [$PACKAGE-config.h]),[dnl
	AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl
	AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl
	AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl
	AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl
	AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl
	AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl
	m4_pushdef([_script],[conftest.prefix])dnl
	m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl
	_OUT=`echo m4_default([$1], [$PACKAGE-config.h])`
	_DEF=`echo _$_OUT \| sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"`
	_PKG=`echo m4_default([$2], [$PACKAGE])`
	_LOW=`echo _$_PKG \| sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"`
	_UPP=`echo $_PKG \| sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:" -e "/^@<:@m4_cr_digits@:>@/s/^/_/"`
	_INP=`echo "$3" \| sed -e 's/ *//'`
	if test ".$_INP" = "."; then
	for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue
	case "$ac_file" in
	*.h) _INP=$ac_file ;;
	*)
	esac
	test ".$_INP" != "." && break
	done
	fi
	if test ".$_INP" = "."; then
	case "$_OUT" in
	/) _INP=`basename "$_OUT"`
	;;
	-) _INP=`echo "$_OUT" \| sed -e "s/@<:@_symbol@:>@*-//"`
	;;
	*) _INP=config.h
	;;
	esac
	fi
	if test -z "$_PKG" ; then
	AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
	else
	if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then
	_INP="$srcdir/$_INP"
	fi fi
	AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines)
	if test -f $_INP ; then
	AS_ECHO(["s/^@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/"]) > _script
	AS_ECHO(["s/^@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/"]) >> _script
	AS_ECHO(["s/^@%:@def[]ine \\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1\\"]) >> _script
	AS_ECHO(["@%:@def[]ine $_UPP""_\\1\\2\\"]) >> _script
	AS_ECHO(["@%:@endif/"]) >> _script
	AS_ECHO(["s/^@%:@def[]ine \\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1\\"]) >> _script
	AS_ECHO(["@%:@define $_LOW""_\\1\\2\\"]) >> _script
	AS_ECHO(["@%:@endif/"]) >> _script
	# now executing _script on _DEF input to create _OUT output file
	echo "@%:@ifndef $_DEF" >$tmp/pconfig.h
	echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h
	echo ' ' >>$tmp/pconfig.h
	echo /'' $_OUT. Generated automatically at end of configure. ''/ >>$tmp/pconfig.h

	sed -f _script $_INP >>$tmp/pconfig.h
	echo ' ' >>$tmp/pconfig.h
	echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h
	echo "@%:@endif" >>$tmp/pconfig.h
	if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then
	AC_MSG_NOTICE([$_OUT is unchanged])
	else
	ac_dir=`AS_DIRNAME(["$_OUT"])`
	AS_MKDIR_P(["$ac_dir"])
	rm -f "$_OUT"
	mv $tmp/pconfig.h "$_OUT"
	fi
	else
	AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
	fi
	rm -f conftest.*
	fi
	m4_popdef([_symbol])dnl
	m4_popdef([_script])dnl
	AS_VAR_POPDEF([_INP])dnl
	AS_VAR_POPDEF([_UPP])dnl
	AS_VAR_POPDEF([_LOW])dnl
	AS_VAR_POPDEF([_PKG])dnl
	AS_VAR_POPDEF([_DEF])dnl
	AS_VAR_POPDEF([_OUT])dnl
	],[PACKAGE="$PACKAGE"])])