Use OCL_USE_PCH to control the using pch or not.

Junyan has added the environment variable OCL_USE_PCH, but not using it.
Enable it.

Signed-off-by: Yang Rong <rong.r.yang@intel.com>
Reviewed-by: Zhigang Gong <zhigang.gong@linux.intel.com>

diff --git a/backend/src/backend/program.cpp b/backend/src/backend/program.cpp
index c0358b3..893cda3 100644 (file)
--- a/backend/src/backend/program.cpp
+++ b/backend/src/backend/program.cpp
@@ -661,7 +661,7 @@ namespace gbe {
     FILE *clFile = fopen(clName.c_str(), "w");
     FATAL_IF(clFile == NULL, "Failed to open temporary file");
 
-    bool usePCH = true;
+    bool usePCH = OCL_USE_PCH;
     bool findPCH = false;
 
     /* Because our header file is so big, we want to avoid recompile the header from