OK, so dynamic libraries are nice since a -lfoo fill automatically link
againse libbar.so and libfred.so (where necessary--as long as the dynamic
libraries are done properly). Static libraries don't contain that
information, so it's not quite so nice. Sadly some systems (the version of
Solaris/SPARC which I hace access to and which has a half decent compiler)
have a mixture of static and dynamic libraries (eg libz is available as
static only).
Anyway, here's my solution so far. It doesn't seem very clean or general
to me. I don't want a banket test for libz in this case, since I don't
want it carried around of libtiff fails (and it's unnecessary on many
systems). Is there a better way of doing this?
#I want jpeg if possible anyway, but do it first, since tiff might need it
#as well
AC_CHECK_HEADERS(jpeglib.h)
AC_CHECK_LIB(jpeg, jpeg_destroy_decompress)
if test "$ac_cv_header_jpeglib_h" = yes && test "$ac_cv_lib_jpeg_jpeg_destroy_decompress" = yes
then
AC_DEFINE(CVD_IMAGE_HAVE_JPEG, [JPEG,])
AC_SUBST(have_jpeg,yes)
options="$options jpeg"
fi
AC_CHECK_HEADERS(tiffio.h)
if test "$ac_cv_header_tiffio_h" = yes
then
AC_CHECK_LIB(tiff, TIFFReadRGBAImageOriented)
if test "$ac_cv_lib_tiff_TIFFReadRGBAImageOriented" = yes
then
AC_DEFINE(CVD_IMAGE_HAVE_TIFF, [TIFF,])
AC_SUBST(have_tiff,yes)
options="$options tiff"
else
AC_MSG_CHECKING([if perhaps libtiff requires zlib])
AC_MSG_RESULT()
foo_LIBS="$LIBS"
AC_CHECK_LIB(z, deflate)
unset ac_cv_lib_tiff_TIFFReadRGBAImageOriented
AC_CHECK_LIB(tiff, TIFFReadRGBAImageOriented)
if test "$ac_cv_lib_tiff_TIFFReadRGBAImageOriented" = yes
then
AC_MSG_CHECKING([if perhaps libtiff requires zlib...])
AC_MSG_RESULT(yes)
AC_DEFINE(CVD_IMAGE_HAVE_TIFF, [TIFF,])
AC_SUBST(have_tiff,yes)
options="$options tiff"
else
LIBS="$foo_LIBS"
fi
fi
fi
-Ed
--
(You can't go wrong with psycho-rats.) (er258)(@)(eng.cam)(.ac.uk)
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