framework: Make error about mixed GLES and GL more imformative

This just adds a helpful message about what directory the conflicting
shaders are in.

1 files changed, 2 insertions, 1 deletions

diff --git a/framework/test/shader_test.py b/framework/test/shader_test.py
index 719b92f9d..de3e92f4b 100644
--- a/framework/test/shader_test.py
+++ b/framework/test/shader_test.py
@@ -251,7 +251,8 @@ class MultiShaderTest(ReducedProcessMixin, PiglitBaseTest):
                         # check
                         raise exceptions.PiglitInternalError(
                             'GLES and GL shaders in the same command!\n'
-                            'Cannot pick a shader_runner binary!')
+                            'Cannot pick a shader_runner binary!\n'
+                            'in file: {}'.format(os.path.dirname(each)))
             else:
                 prog = parser.prog