1#							-*- Autoconf -*-
2# This file is part of the aMule Project.
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4# Copyright (c) 2003-2011 aMule Team ( admin@amule.org / http://www.amule.org )
5#
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18# GNU General Public License for more details.
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22# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
23#
24
25dnl ---------------------------------------------------------------------------
26dnl MULE_CHECK_LIBPNG([VERSION = 1.2.0], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
27dnl
28dnl adds support for --with-libpng-prefix and --with-libpng-config
29dnl command line options
30dnl
31dnl Test for libpng, and define LIBPNG_CFLAGS, LIBPNG_LIBS and LIBPNG_CONFIG_NAME
32dnl environment variable to override the default name of the libpng-config script
33dnl to use. Set LIBPNG_CONFIG_PATH to specify the full path to libpng-config -
34dnl in this case the macro won't even waste time on tests for its existence.
35dnl ---------------------------------------------------------------------------
36AC_DEFUN([MULE_CHECK_LIBPNG],
37[dnl
38m4_define([REQUIRED_VERSION], [m4_ifval([$1], [$1], [1.2.0])])dnl
39m4_define([REQUIRED_VERSION_MAJOR], [m4_bregexp(REQUIRED_VERSION, [\([0-9]+\)\.\([0-9]+\)\.\([0-9]+\)], [\1])])dnl
40m4_define([REQUIRED_VERSION_MINOR], [m4_bregexp(REQUIRED_VERSION, [\([0-9]+\)\.\([0-9]+\)\.\([0-9]+\)], [\2])])dnl
41m4_define([REQUIRED_VERSION_MICRO], [m4_bregexp(REQUIRED_VERSION, [\([0-9]+\)\.\([0-9]+\)\.\([0-9]+\)], [\3])])dnl
42
43	AC_ARG_WITH([libpng-prefix], [AS_HELP_STRING([--with-libpng-prefix=PREFIX], [prefix where libpng is installed (optional)])])
44	AC_ARG_WITH([libpng-config], [AS_HELP_STRING([--with-libpng-config=CONFIG], [libpng-config script to use (optional)])])
45
46	LIBPNG_VERSION=
47
48	# do we have libpng-config name: it can be libpng-config or libpng12-config or ...
49	AS_IF([test x${LIBPNG_CONFIG_NAME+set} != xset], [LIBPNG_CONFIG_NAME=libpng-config])
50	AS_IF([test -n "$with_libpng_config"], [LIBPNG_CONFIG_NAME="$with_libpng_config"])
51
52	# deal with optional prefix
53	AS_IF([test -n "$with_libpng_prefix"], [LIBPNG_LOOKUP_PATH="$with_libpng_prefix/bin"])
54
55	# don't search the PATH if LIBPNG_CONFIG_NAME is absolute filename
56	AS_IF([test -x "$LIBPNG_CONFIG_NAME"], [
57		AC_MSG_CHECKING([for libpng-config])
58		LIBPNG_CONFIG_PATH="$LIBPNG_CONFIG_NAME"
59		AC_MSG_RESULT($LIBPNG_CONFIG_PATH)
60	], [AC_PATH_PROG([LIBPNG_CONFIG_PATH], [$LIBPNG_CONFIG_NAME], [no], [$LIBPNG_LOOKUP_PATH:$PATH])])
61
62	AS_IF([test ${LIBPNG_CONFIG_PATH:-no} != no],
63	[
64		AC_MSG_CHECKING([for libpng version >= REQUIRED_VERSION])
65
66		LIBPNG_CONFIG_WITH_ARGS="$LIBPNG_CONFIG_PATH $libpng_config_args"
67
68		LIBPNG_VERSION=`$LIBPNG_CONFIG_WITH_ARGS --version`
69		libpng_config_major_version=`echo $LIBPNG_VERSION | sed ['s/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1/']`
70		libpng_config_minor_version=`echo $LIBPNG_VERSION | sed ['s/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\2/']`
71		libpng_config_micro_version=`echo $LIBPNG_VERSION | sed ['s/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\3/']`
72
73		libpng_ver_ok=
74		MULE_IF([test $libpng_config_major_version -gt REQUIRED_VERSION_MAJOR], [libpng_ver_ok=yes],
75			[test $libpng_config_major_version -eq REQUIRED_VERSION_MAJOR], [
76				MULE_IF([test $libpng_config_minor_version -gt REQUIRED_VERSION_MINOR], [libpng_ver_ok=yes],
77					[test $libpng_config_minor_version -eq REQUIRED_VERSION_MINOR],
78						[MULE_IF([test $libpng_config_micro_version -ge REQUIRED_VERSION_MICRO], [libpng_ver_ok=yes])])
79			])
80
81		AS_IF([test -z "$libpng_ver_ok"], [
82			AS_IF([test -z "$LIBPNG_VERSION"], [AC_MSG_RESULT([no])], [
83				AC_MSG_RESULT([no (version $LIBPNG_VERSION is not new enough)])
84				LIBPNG_VERSION=
85			])
86		], [
87			LIBPNG_LIBS=`$LIBPNG_CONFIG_WITH_ARGS --libs`
88			LIBPNG_LDFLAGS=`$LIBPNG_CONFIG_WITH_ARGS --ldflags | sed -e "s/ *${LIBPNG_LIBS}$//"`
89			LIBPNG_CFLAGS=`$LIBPNG_CONFIG_WITH_ARGS --cflags`
90			AC_MSG_RESULT([yes (version $LIBPNG_VERSION)])
91
92			AC_MSG_CHECKING([if libpng is usable])
93
94			SAVED_CFLAGS=$CFLAGS
95			SAVED_LDFLAGS=$LDFLAGS
96			SAVED_LIBS=$LIBS
97
98			CFLAGS+=" $LIBPNG_CFLAGS"
99			LDFLAGS+=" $LIBPNG_LDFLAGS"
100			LIBS+=" $LIBPNG_LIBS"
101
102			AC_LINK_IFELSE([
103				AC_LANG_PROGRAM([[
104					#include <png.h>
105					#include <stdio.h>
106				]], [[
107					png_uint_32 libpng_vn = png_access_version_number();
108					printf("\nlibpng version %i\n\n", libpng_vn);
109				]])
110			], [
111				AC_MSG_RESULT([yes])
112			],
113			[
114				AC_MSG_RESULT([no (failed to compile and link test program)])
115				LIBPNG_LIBS=
116				LIBPNG_LDFLAGS=
117				LIBPNG_CFLAGS=
118				LIBPNG_VERSION=
119			])
120
121			CFLAGS=$SAVED_CFLAGS
122			LDFLAGS=$SAVED_LDFLAGS
123			LIBS=$SAVED_LIBS
124		])
125	])
126
127	AS_IF([test -n "$LIBPNG_VERSION"], [$2], [$3])
128
129AC_SUBST([LIBPNG_CFLAGS])dnl
130AC_SUBST([LIBPNG_LDFLAGS])dnl
131AC_SUBST([LIBPNG_LIBS])dnl
132
133m4_undefine([REQUIRED_VERSION])dnl
134m4_undefine([REQUIRED_VERSION_MAJOR])dnl
135m4_undefine([REQUIRED_VERSION_MINOR])dnl
136m4_undefine([REQUIRED_VERSION_MICRO])dnl
137])
138