configure: error out when building backend-less libEGL

Cc: "10.5 10.6" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit ddc886b5bfe5976fa2e5f49eeefa918736f1aa97)

diff --git a/configure.ac b/configure.ac
index a165bd6..7b1c444 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1379,8 +1379,12 @@ if test "x$enable_egl" = xyes; then
 
     if test "$enable_static" != yes; then
         if test "x$enable_dri" = xyes; then
-           HAVE_EGL_DRIVER_DRI2=1
-       fi
+            HAVE_EGL_DRIVER_DRI2=1
+        else
+            # Avoid building an "empty" libEGL. Drop/update this
+            # when other backends (haiku?) come along.
+            AC_MSG_ERROR([egl requires --enable-dri])
+        fi
 
     fi
 fi