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configure: Moved detection of GIF support to a dedicated macro
The original check was not compliant with autoconf's syntax, did not have a very good behaviour for user and was not easy to make evolve. The new macro: - uses as much as possible autoconf macros for portability and code consistency; - provides a consistent behaviour on yes/no/auto (if user explicitly enables support, do not silently disable if not found; if library is found but not the header, complain to let user install it or explicitly disable support); - makes uses of shell functions to keep generated configure smaller by sharing reusable stuff; - introduces a tracking of unsupported things to be reported to user It includes a fixes from a problem found by Amadeusz S-B³awiñski, because-A the function 'wm_fn_imgfmt_try_link' modified the variable LDFLAGS instead of LIBS. Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
This commit is contained in:
Christophe CURIS
committed by
Carlos R. Mafra
Carlos R. Mafra
parent
6223ed1854
commit
f892ce4d37
110
m4/wm_imgfmt_check.m4
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110
m4/wm_imgfmt_check.m4
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# wm_imgfmt_check.m4 - Macros to check for image file format support libraries
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#
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# Copyright (c) 2013 Christophe CURIS
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# WM_IMGFMT_CHECK_GIF
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# -------------------
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#
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# Check for GIF file support through 'libgif' or 'libungif'
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# The check depends on variable 'enable_gif' being either:
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# yes - detect, fail if not found
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# no - do not detect, disable support
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# auto - detect, disable if not found
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#
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# When found, append appropriate stuff in GFXLIBS, and append info to
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# the variable 'supported_gfx'
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# When not found, append info to variable 'unsupported'
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AC_DEFUN_ONCE([WM_IMGFMT_CHECK_GIF],
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[AC_REQUIRE([_WM_IMGFMT_CHECK_FUNCTS])
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AS_IF([test "x$enable_gif" = "xno"],
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[unsupported="$unsupported GIF"],
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[AC_CACHE_CHECK([for GIF support library], [wm_cv_imgfmt_gif],
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[wm_cv_imgfmt_gif=no
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wm_save_LIBS="$LIBS"
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dnl
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dnl We check first if one of the known libraries is available
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for wm_arg in "-lgif" "-lungif" ; do
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AS_IF([wm_fn_imgfmt_try_link "DGifOpenFileName" "$XLFLAGS $XLIBS $wm_arg"],
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[wm_cv_imgfmt_gif="$wm_arg" ; break])
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done
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LIBS="$wm_save_LIBS"
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AS_IF([test "x$enable_gif$wm_cv_imgfmt_gif" = "xyesno"],
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[AC_MSG_ERROR([explicit GIF support requested but no library found])])
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AS_IF([test "x$wm_cv_imgfmt_gif" != "xno"],
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[dnl
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dnl A library was found, now check for the appropriate header
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wm_save_CFLAGS="$CFLAGS"
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AS_IF([wm_fn_imgfmt_try_compile "gif_lib.h" "return 0" ""],
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[],
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[AC_MSG_ERROR([found $wm_cv_imgfmt_gif but could not find appropriate header - are you missing libgif-dev package?])])
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AS_IF([wm_fn_imgfmt_try_compile "gif_lib.h" "DGifOpenFileName(filename)" ""],
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[wm_cv_imgfmt_gif="$wm_cv_imgfmt_gif version:4"],
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[AC_MSG_ERROR([found $wm_cv_imgfmt_gif and header, but cannot compile - unsupported version?])])
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CFLAGS="$wm_save_CFLAGS"])
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])
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AS_IF([test "x$wm_cv_imgfmt_gif" = "xno"],
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[unsupported="$unsupported GIF"
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enable_gif="no"],
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[supported_gfx="$supported_gfx GIF"
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GFXLIBS="$GFXLIBS `echo "$wm_cv_imgfmt_gif" | sed -e 's, *version:.*,,' `"
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AC_DEFINE_UNQUOTED([USE_GIF],
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[1],
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[defined when valid GIF library with header was found])])
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])dnl
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]) dnl AC_DEFUN
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# _WM_IMGFMT_CHECK_FUNCTS
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# -----------------------
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# (internal shell functions)
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#
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# Create 2 shell functions:
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# wm_fn_imgfmt_try_link: try to link against library
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# wm_fn_imgfmt_try_compile: try to compile against header
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#
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AC_DEFUN_ONCE([_WM_IMGFMT_CHECK_FUNCTS],
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[@%:@ wm_fn_imgfmt_try_link FUNCTION LFLAGS
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@%:@ -------------------------------------
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@%:@ Try linking aginst library in $LFLAGS using function named $FUNCTION
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@%:@ Assumes that LIBS have been saved in 'wm_save_LIBS' by caller
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wm_fn_imgfmt_try_link ()
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{
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LIBS="$wm_save_LIBS $[]2"
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AC_TRY_LINK_FUNC([$[]1],
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[wm_retval=0],
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[wm_retval=1])
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AS_SET_STATUS([$wm_retval])
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}
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@%:@ wm_fn_imgfmt_try_compile HEADER FUNC_CALL CFLAGS
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@%:@ -----------------------------------------
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@%:@ Try to compile using header $HEADER and trying to call a function
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@%:@ using the $FUNC_CALL expression and using extra $CFLAGS in the
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@%:@ compiler's command line
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@%:@ Assumes that CFLAGS have been saved in 'wm_save_CFLAGS' by caller
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wm_fn_imgfmt_try_compile ()
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{
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CFLAGS="$wm_save_CFLAGS $[]3"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([@%:@include <$[]1>
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const char *filename = "dummy";], [ $[]2;])],
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[wm_retval=0],
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[wm_retval=1])
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AS_SET_STATUS([$wm_retval])
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}
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])
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