120 lines
3.1 KiB
Plaintext
120 lines
3.1 KiB
Plaintext
dnl From FIND_MOTIF and ACX_PTHREAD, without much understanding
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dnl
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dnl FIND_LIBWEBP[ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]
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dnl ---------------------------------------------------
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dnl
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dnl Find webp libraries and headers ... useful for platforms which are missing
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dnl the webp .pc file
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dnl
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dnl Put compile stuff in LIBWEBP_INCLUDES
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dnl Put link stuff in LIBWEBP_LIBS
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dnl Define HAVE_LIBWEBP if found.
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dnl
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AC_DEFUN([FIND_LIBWEBP], [
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AC_REQUIRE([AC_PATH_XTRA])
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LIBWEBP_INCLUDES=""
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LIBWEBP_LIBS=""
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AC_ARG_WITH(libwebp,
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AS_HELP_STRING([--without-libwebp], [build without libwebp (default: test)]))
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# Treat --without-libwebp like --without-libwebp-includes --without-libwebp-libraries.
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if test "$with_libwebp" = "no"; then
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LIBWEBP_INCLUDES=no
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LIBWEBP_LIBS=no
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fi
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AC_ARG_WITH(libwebp-includes,
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AS_HELP_STRING([--with-libwebp-includes=DIR], [libwebp includes are in DIR]),
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LIBWEBP_INCLUDES="-I$withval")
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AC_ARG_WITH(libwebp-libraries,
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AS_HELP_STRING([--with-libwebp-libraries=DIR], [libwebp libraries are in DIR]),
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LIBWEBP_LIBS="-L$withval -lwebp")
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AC_MSG_CHECKING(for libwebp)
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# Look for webp/decode.h
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if test "$LIBWEBP_INCLUDES" = ""; then
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# Check the standard search path
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AC_TRY_COMPILE([#include <webp/decode.h>],[int a;],[
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LIBWEBP_INCLUDES=""
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], [
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# webp/decode.h is not in the standard search path, try
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# $prefix
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libwebp_save_CFLAGS="$CFLAGS"
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CFLAGS="-I${prefix}/include $CFLAGS"
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AC_TRY_COMPILE([#include <webp/decode.h>],[int a;],[
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LIBWEBP_INCLUDES="-I${prefix}/include"
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], [
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LIBWEBP_INCLUDES="no"
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])
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CFLAGS=$libwebp_save_CFLAGS
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])
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fi
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# Now for the libraries
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if test "$LIBWEBP_LIBS" = ""; then
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libwebp_save_LIBS="$LIBS"
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libwebp_save_CFLAGS="$CFLAGS"
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LIBS="-lwebp $LIBS"
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CFLAGS="$LIBWEBP_INCLUDES $CFLAGS"
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# Try the standard search path first
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AC_TRY_LINK([#include <webp/decode.h>],[WebPInitDecoderConfig(0)], [
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LIBWEBP_LIBS="-lwebp"
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], [
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# libwebp is not in the standard search path, try $prefix
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LIBS="-L${prefix}/lib $LIBS"
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AC_TRY_LINK([#include <webp/decode.h>],[WebPInitDecoderConfig(0)], [
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LIBWEBP_LIBS="-L${prefix}/lib -lwebp"
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], [
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LIBWEBP_LIBS=no
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])
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])
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LIBS="$libwebp_save_LIBS"
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CFLAGS="$libwebp_save_CFLAGS"
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fi
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AC_SUBST(LIBWEBP_LIBS)
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AC_SUBST(LIBWEBP_INCLUDES)
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# Print a helpful message
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libwebp_libraries_result="$LIBWEBP_LIBS"
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libwebp_includes_result="$LIBWEBP_INCLUDES"
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if test x"$libwebp_libraries_result" = x""; then
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libwebp_libraries_result="in default path"
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fi
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if test x"$libwebp_includes_result" = x""; then
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libwebp_includes_result="in default path"
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fi
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if test "$libwebp_libraries_result" = "no"; then
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libwebp_libraries_result="(none)"
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fi
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if test "$libwebp_includes_result" = "no"; then
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libwebp_includes_result="(none)"
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fi
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AC_MSG_RESULT([libraries $libwebp_libraries_result, headers $libwebp_includes_result])
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# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
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if test "$LIBWEBP_INCLUDES" != "no" && test "$LIBWEBP_LIBS" != "no"; then
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AC_DEFINE(HAVE_LIBWEBP,1,[Define if you have libwebp libraries and header files.])
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$1
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else
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LIBWEBP_INCLUDES=""
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LIBWEBP_LIBS=""
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$2
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fi
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])dnl
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