libvips/m4/jpeg.m4

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dnl From FIND_MOTIF and ACX_PTHREAD, without much understanding
dnl
dnl FIND_JPEG[ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]
dnl ------------------------------------------------
dnl
dnl Find JPEG libraries and headers
dnl
dnl Put compile stuff in JPEG_INCLUDES
dnl Put link stuff in JPEG_LIBS
dnl Define HAVE_JPEG if found
dnl
AC_DEFUN([FIND_JPEG], [
AC_REQUIRE([AC_PATH_XTRA])
JPEG_INCLUDES=""
JPEG_LIBS=""
AC_ARG_WITH(jpeg,
AS_HELP_STRING([--without-jpeg], [build without libjpeg (default: test)]))
# Treat --without-jpeg like --without-jpeg-includes --without-jpeg-libraries.
if test "$with_jpeg" = "no"; then
JPEG_INCLUDES=no
JPEG_LIBS=no
fi
AC_ARG_WITH(jpeg-includes,
AS_HELP_STRING([--with-jpeg-includes=DIR], [libjpeg includes are in DIR]),
JPEG_INCLUDES="-I$withval")
AC_ARG_WITH(jpeg-libraries,
AS_HELP_STRING([--with-jpeg-libraries=DIR], [libjpeg libraries are in DIR]),
JPEG_LIBS="-L$withval -ljpeg")
AC_MSG_CHECKING(for JPEG)
# Look for jpeglib.h
if test "$JPEG_INCLUDES" = ""; then
# Check the standard search path
AC_TRY_COMPILE([#include <stdio.h>
#include <jpeglib.h>],[int a;],[
JPEG_INCLUDES=""
], [
# jpeglib.h is not in the standard search path, try
# $prefix
jpeg_save_CFLAGS="$CFLAGS"
CFLAGS="-I${prefix}/include $CFLAGS"
AC_TRY_COMPILE([#include <stdio.h>
#include <jpeglib.h>],[int a;],[
JPEG_INCLUDES="-I${prefix}/include"
], [
JPEG_INCLUDES="no"
])
CFLAGS=$jpeg_save_CFLAGS
])
fi
# Now for the libraries
if test "$JPEG_LIBS" = ""; then
jpeg_save_LIBS="$LIBS"
jpeg_save_CFLAGS="$CFLAGS"
LIBS="-ljpeg $LIBS"
CFLAGS="$JPEG_INCLUDES $CFLAGS"
# Try the standard search path first
AC_TRY_LINK([#include <stdio.h>
#include <jpeglib.h>
],[jpeg_abort((void*)0)], [
JPEG_LIBS="-ljpeg"
], [
# libjpeg is not in the standard search path, try $prefix
LIBS="-L${prefix}/lib $LIBS"
AC_TRY_LINK([#include <stdio.h>
#include <jpeg.h>
],[jpeg_abort((void*)0)], [
JPEG_LIBS="-L${prefix}/lib -ljpeg"
], [
JPEG_LIBS=no
])
])
LIBS="$jpeg_save_LIBS"
CFLAGS="$jpeg_save_CFLAGS"
fi
AC_SUBST(JPEG_LIBS)
AC_SUBST(JPEG_INCLUDES)
# Print a helpful message
jpeg_libraries_result="$JPEG_LIBS"
jpeg_includes_result="$JPEG_INCLUDES"
if test x"$jpeg_libraries_result" = x""; then
jpeg_libraries_result="in default path"
fi
if test x"$jpeg_includes_result" = x""; then
jpeg_includes_result="in default path"
fi
if test "$jpeg_libraries_result" = "no"; then
jpeg_libraries_result="(none)"
fi
if test "$jpeg_includes_result" = "no"; then
jpeg_includes_result="(none)"
fi
AC_MSG_RESULT([libraries $jpeg_libraries_result, headers $jpeg_includes_result])
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test "$JPEG_INCLUDES" != "no" && test "$JPEG_LIBS" != "no"; then
AC_DEFINE(HAVE_JPEG,1,[Define if you have jpeg libraries and header files.])
$1
else
JPEG_INCLUDES=""
JPEG_LIBS=""
$2
fi
])dnl