configure.ac: GLX cannot work without OpenGL

GLX uses mapi/glapi/libglapi.la, which is only built for OpenGL.

If the user specified --enable-xlib-glx --disable-opengl, error out, as these
cannot be both observed at the same time. If the user just specified
--disable-opengl but not --disable-glx, print a warning and disable GLX as
well.

NOTE: This is a candidate for the stable branches.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=59364

Tested-by: Tom Stellard <thomas.stellard@amd.com>
(cherry picked from commit 3b888f534cd42065b01ede8b9c646a2be0015509)

diff --git a/configure.ac b/configure.ac
index 2f0f110..09ff880 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -706,6 +706,16 @@ if test "x$enable_dri$enable_xlib_glx" = xyesyes; then
     AC_MSG_ERROR([DRI and Xlib-GLX cannot be built together])
 fi
 
+if test "x$enable_opengl$enable_xlib_glx" = xnoyes; then
+    AC_MSG_ERROR([Xlib-GLX cannot be built without OpenGL])
+fi
+
+# Disable GLX if OpenGL is not enabled
+if test "x$enable_glx$enable_opengl" = xyesno; then
+    AC_MSG_WARN([OpenGL not enabled, disabling GLX])
+    enable_glx=no
+fi
+
 # Disable GLX if DRI and Xlib-GLX are not enabled
 if test "x$enable_glx" = xyes -a \
         "x$enable_dri" = xno -a \