mesa: Don't overwrite a driver's shader infolog with generic failure message.

(cherry picked from commit 07a248a3664e4cd63c98ff3478bdd9b1e45c1398)

1 files changed, 4 insertions, 1 deletions

diff --git a/src/mesa/shader/slang/slang_link.c b/src/mesa/shader/slang/slang_link.c
index 7c7bfbdbc5..e8dca01426 100644
--- a/src/mesa/shader/slang/slang_link.c
+++ b/src/mesa/shader/slang/slang_link.c
@@ -921,7 +921,10 @@ _slang_link(GLcontext *ctx,
 
    if (!vertNotify || !fragNotify) {
       /* driver rejected one/both of the vertex/fragment programs */
-      link_error(shProg, "Vertex and/or fragment program rejected by driver\n");
+      if (!shProg->InfoLog) {
+	 link_error(shProg,
+		    "Vertex and/or fragment program rejected by driver\n");
+      }
    }
    else {
       shProg->LinkStatus = (shProg->VertexProgram || shProg->FragmentProgram);