[Piglit] [PATCH 2/4] cmake: workaround cmake bug when GLUT is not found

[nobled]

Silences thousands of lines of spam.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=42700
---
 CMakeLists.txt |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7c31173..d56fd8c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,20 @@ find_package(GLUT REQUIRED)
 find_package(PNG REQUIRED)
 find_package(X11)

+# The 'REQUIRED' above correctly produces an error for
+# OpenGL and PNG, but there's a bug involving FindGLUT.cmake
+# that fails to produce the error as of CMake 2.8.5.
+#
+# Instead, CMake keeps going and eventually spams
+# the console with a message for every target that used
+# e.g. the ${GLUT_INCLUDE_DIR} variable. So it
+# prints a line for basically every single test in piglit.
+#
+# Work around the bug and error out quickly here instead.
+if (NOT GLUT_FOUND)
+	message(FATAL_ERROR "GLUT library not found")
+endif()
+
 # Check for presence of Python 2.6 or greater.
 foreach(python_cmd python2 python)
 	execute_process(
-- 
1.7.4.1