m4/libpng.m4

   1 #                                                       -*- Autoconf -*-
   2 # This file is part of the aMule Project.
   3 #
   4 # Copyright (c) 2003-2011 aMule Team ( admin@amule.org / http://www.amule.org )
   5 #
   6 # Any parts of this program derived from the xMule, lMule or eMule project,
   7 # or contributed by third-party developers are copyrighted by their
   8 # respective authors.
   9 #
  10 # This program is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program; if not, write to the Free Software
  22 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  23 #
  24
  25 dnl ---------------------------------------------------------------------------
  26 dnl MULE_CHECK_LIBPNG([VERSION = 1.2.0], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
  27 dnl
  28 dnl adds support for --with-libpng-prefix and --with-libpng-config
  29 dnl command line options
  30 dnl
  31 dnl Test for libpng, and define LIBPNG_CFLAGS, LIBPNG_LIBS and LIBPNG_CONFIG_NAME
  32 dnl environment variable to override the default name of the libpng-config script
  33 dnl to use. Set LIBPNG_CONFIG_PATH to specify the full path to libpng-config -
  34 dnl in this case the macro won't even waste time on tests for its existence.
  35 dnl ---------------------------------------------------------------------------
  36 AC_DEFUN([MULE_CHECK_LIBPNG],
  37 [dnl
  38 m4_define([REQUIRED_VERSION], [m4_ifval([$1], [$1], [1.2.0])])dnl
  39 m4_define([REQUIRED_VERSION_MAJOR], [m4_bregexp(REQUIRED_VERSION, [\([0-9]+\)\.\([0-9]+\)\.\([0-9]+\)], [\1])])dnl
  40 m4_define([REQUIRED_VERSION_MINOR], [m4_bregexp(REQUIRED_VERSION, [\([0-9]+\)\.\([0-9]+\)\.\([0-9]+\)], [\2])])dnl
  41 m4_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="$CFLAGS $LIBPNG_CFLAGS"
  99                         LDFLAGS="$LDFLAGS $LIBPNG_LDFLAGS"
 100                         LIBS="$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
 129 AC_SUBST([LIBPNG_CFLAGS])dnl
 130 AC_SUBST([LIBPNG_LDFLAGS])dnl
 131 AC_SUBST([LIBPNG_LIBS])dnl
 132
 133 m4_undefine([REQUIRED_VERSION])dnl
 134 m4_undefine([REQUIRED_VERSION_MAJOR])dnl
 135 m4_undefine([REQUIRED_VERSION_MINOR])dnl
 136 m4_undefine([REQUIRED_VERSION_MICRO])dnl
 137 ])