83 lines
2.2 KiB
Text
83 lines
2.2 KiB
Text
# SYNOPSIS
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#
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# AX_CHECK_LIBJPEG(required_version, lib_dir)
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#
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# DESCRIPTION
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#
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# Check whether the system has libjpeg version required_version.
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#
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# LAST MODIFICATION
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#
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# 2007-11-08
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#
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# COPYLEFT
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#
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# Copyright (c) 2006 Nicolas Calimet
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#
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# Copying and distribution of this file, with or without
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# modification, are permitted in any medium without royalty provided
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# the copyright notice and this notice are preserved.
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AC_DEFUN([AX_CHECK_LIBJPEG],
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[
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ax_check_libjpeg_save_cppflags="$CPPFLAGS"
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ax_check_libjpeg_save_ldflags="$LDFLAGS"
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if test x"$2" != x""; then
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CPPFLAGS="-I$2/../include $CPPFLAGS"
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LDFLAGS="-L$2 $LDFLAGS"
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fi
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# required numeric version (e.g. 6b -> 62)
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ax_check_libjpeg_version_num=`echo $1 | tr [[a-i]] [[1-9]]`
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# check the library
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AC_SEARCH_LIBS(
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[jpeg_std_error],
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[jpeg],
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[
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# check include file
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AC_CHECK_HEADER(
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[jpeglib.h],
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[
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# check library version, update LIBS
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if test x"$1" != x"$ax_check_libjpeg_version_num"; then
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AC_MSG_CHECKING([for libjpeg version >= $1 ($ax_check_libjpeg_version_num)])
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else
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AC_MSG_CHECKING([for libjpeg version >= $1])
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fi
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AC_RUN_IFELSE(
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[
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AC_LANG_SOURCE(
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[#include <stdio.h>
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#include "jpeglib.h"
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int main (void)
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{
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fprintf (stderr, "%d\n", JPEG_LIB_VERSION);
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return 0;
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}]
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)
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],
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[
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ax_check_libjpeg_version=`eval $ac_try 2>&1`
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AX_COMPARE_VERSION([$ax_check_libjpeg_version], [ge], [$ax_check_libjpeg_version_num], [ax_check_libjpeg="ok"], [ax_check_libjpeg="bad"])
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AC_MSG_RESULT([$ax_check_libjpeg_version, $ax_check_libjpeg])
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],
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[
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ax_check_libjpeg="unknown"
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AC_MSG_RESULT([$ax_check_libjpeg])
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],
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[AC_MSG_RESULT([cross-compiling, forced])]
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) # AC_RUN_IFELSE
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],
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[ax_check_libjpeg="no headers"]
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) # AC_CHECK_HEADER
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],
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[ax_check_libjpeg="not found"],
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[]
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) # AC_SEARCH_LIBS
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if test x"$ax_check_libjpeg" != x"ok"; then
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CPPFLAGS="$ax_check_libjpeg_save_cppflags"
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LDFLAGS="$ax_check_libjpeg_save_ldflags"
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fi
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])
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