[Mesa-stable] [PATCH 1/2] configure: error out of building GBM without dri

[Emil Velikov]

Both backends require --enable-dri, and building an empty libgbm
makes little to no sense. Error out at configure to prevent the
user from shooting themselves in the foot.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78225
Cc: "10.1 10.2" <mesa-stable at lists.freedesktop.org>
Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>
---

Strictly speaking, not crucial for mesa-stable, although it
will be nice to have. I do not feel too strong either way.

-Emil

 configure.ac | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/configure.ac b/configure.ac
index e77ed77..371c17f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1179,6 +1179,13 @@ if test "x$enable_gbm" = xyes; then
         if test "x$enable_shared_glapi" = xno; then
             AC_MSG_ERROR([gbm_dri requires --enable-shared-glapi])
         fi
+    else
+        # Strictly speaking libgbm does not require --enable-dri, although
+        # both of its backends do. Thus one can build libgbm without any
+        # backends if --disable-dri is set.
+        # To avoid unnecessary complexity of checking if at least one backend
+        # is available when building, just mandate --enable-dri.
+        AC_MSG_ERROR([gbm requires --enable-dri])
     fi
 fi
 AM_CONDITIONAL(HAVE_GBM, test "x$enable_gbm" = xyes)
-- 
1.9.2