[Mesa-stable] [PATCH v2 07/27] configure: error out when building GLX w/o the X11 platform

[Emil Velikov]

From: Emil Velikov <emil.velikov at collabora.com>

Building EGL/Vulkan/other without X11, while GLX is enabled is confusing
and misleading. In practise anyone aiming at the former will also
disable GLX.

The inverse (some examples below) should still work:
 ./configure --disable-glx --with-platforms=x11 --with-vulkan-drivers=intel
 ./configure --disable-glx --with-platforms=x11 --enable-egl

Keep in mind that the X11 platform is enabled, by default.

Cc: <mesa-stable at lists.freedesktop.org>
Signed-off-by: Emil Velikov <emil.velikov at collabora.com>
---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure.ac b/configure.ac
index d76ad5039a2..920e3c53e7b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1724,6 +1724,12 @@ for plat in $platforms; do
 	esac
 done
 
+if test "x$enable_glx" != xno; then
+    if ! echo "$platforms" | grep -q 'x11'; then
+        AC_MSG_ERROR([Building without the x11 platform as GLX is enabled, is not supported])
+    fi
+fi
+
 AM_CONDITIONAL(HAVE_PLATFORM_X11, echo "$platforms" | grep -q 'x11')
 AM_CONDITIONAL(HAVE_PLATFORM_WAYLAND, echo "$platforms" | grep -q 'wayland')
 AM_CONDITIONAL(HAVE_PLATFORM_DRM, echo "$platforms" | grep -q 'drm')
-- 
2.12.2