Implement support for libmodplug in Engine.Music.

[upkg.git] / m4 / libmodplug.m4

diff --git a/m4/libmodplug.m4 b/m4/libmodplug.m4
new file mode 100644 (file)
index 0000000..cd16e8a
--- /dev/null
+++ b/m4/libmodplug.m4
@@ -0,0 +1,75 @@
+AC_DEFUN([_LIBMODPLUG_TEST], [dnl
+AC_CACHE_CHECK([whether libmodplug works],
+       [libmodplug_cv_works],
+       [AC_LINK_IFELSE([AC_LANG_PROGRAM([dnl
+#include <modplug.h>
+], [dnl
+unsigned char buf@<:@128@:>@ = {0};
+ModPlugFile *f = ModPlug_Load(buf, sizeof buf);
+ModPlug_Unload(f);
+])], [libmodplug_cv_works=yes], [libmodplug_cv_works=no])])
+])
+
+dnl CHECK_LIBMODPLUG([action-if-ok], [action-if-fail])
+AC_DEFUN([CHECK_LIBMODPLUG],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([LIBMODPLUG_CFLAGS], [C compiler flags for libmodplug])dnl
+AC_ARG_VAR([LIBMODPLUG_LIBS],   [linker flags for libmodplug])dnl
+
+if test x"$PKG_CONFIG" != x; then
+       AC_MSG_CHECKING([pkg-config database for libmodplug])
+       _PKG_CONFIG([libmodplug_cflags], [cflags], [libmodplug])
+       _PKG_CONFIG([libmodplug_libs],   [libs],   [libmodplug])
+       if test x$pkg_failed = xyes; then
+               errors=`$PKG_CONFIG --errors-to-stdout --print-errors libmodplug`
+               echo "$errors" >&AS_MESSAGE_LOG_FD
+               AC_MSG_RESULT([no])
+       else
+               if test x"$LIBMODPLUG_CFLAGS" = x; then
+                       LIBMODPLUG_CFLAGS=$pkg_cv_libmodplug_cflags
+               fi
+               if test x"$LIBMODPLUG_LIBS" = x; then
+                       LIBMODPLUG_LIBS=$pkg_cv_libmodplug_libs
+               fi
+
+               AC_MSG_RESULT([yes])
+       fi
+fi
+
+if test x"$LIBMODPLUG_CFLAGS" = x; then
+       LIBMODPLUG_CFLAGS="-I$includedir/libmodplug"
+fi
+
+if test x"$LIBMODPLUG_LIBS" = x; then
+       LIBMODPLUG_LIBS=-lmodplug
+fi
+
+AC_LANG_PUSH([C])
+old_cflags=$CFLAGS
+old_libs=$LIBS
+CFLAGS="$LIBMODPLUG_CFLAGS $CFLAGS"
+LIBS="$LIBMODPLUG_LIBS $LIBS"
+
+_LIBMODPLUG_TEST
+
+CFLAGS=$old_cflags
+LIBS=$old_libs
+AC_LANG_POP([C])
+
+if test x"$libmodplug_cv_works" = x"yes"; then
+       AC_SUBST([LIBMODPLUG_CFLAGS])
+       AC_SUBST([LIBMODPLUG_LIBS])
+       ifelse([$1], [], [true], [$1])
+else
+       ifelse([$2], [], [AC_MSG_FAILURE([dnl
+libmodplug is required.  The latest version can be
+obtained from http://modplug-xmms.sourceforge.net/.
+
+If libmodplug is installed but was not found by this configure script,
+consider adjusting LIBMODPLUG_CFLAGS and/or LIBMODPLUG_LIBS as necessary.
+
+If pkg-config is installed, it may help to adjust PKG_CONFIG_PATH
+if libmodplug is installed in a non-standard prefix.
+])], [$2])
+fi
+])