[Beignet] [0.9.x Branch] GBE: fix bugs when handling -cl-std option.

[Zhigang Gong]

Actually, CLANG does take this option and we should not
filter it out. We also change the default option to create
PCH file to -cl-std=CL1.2. And if the user pass in a CL1.1
we will have to disable PCH.

Another change is that if we are CL1.2, then we should enable
the cl_khr_fp64 by default. As from CL1.2, this extension should
be enabled by default.

Signed-off-by: Zhigang Gong <zhigang.gong at intel.com>
---
 backend/src/CMakeLists.txt      |  2 +-
 backend/src/backend/program.cpp | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/backend/src/CMakeLists.txt b/backend/src/CMakeLists.txt
index 23ccc27..a3818ab 100644
--- a/backend/src/CMakeLists.txt
+++ b/backend/src/CMakeLists.txt
@@ -50,7 +50,7 @@ else (LLVM_VERSION_NODOT VERSION_GREATER 32)
         set (clang_cmd -cc1 -x cl -triple ptx32)
     endif (LLVM_VERSION_NODOT VERSION_GREATER 31)
 endif (LLVM_VERSION_NODOT VERSION_GREATER 32)
-set (clang_cmd ${clang_cmd} -fno-builtin -DGEN7_SAMPLER_CLAMP_BORDER_WORKAROUND)
+set (clang_cmd ${clang_cmd} -cl-std=CL1.2 -fno-builtin -DGEN7_SAMPLER_CLAMP_BORDER_WORKAROUND)
 
 add_custom_command(
      OUTPUT ${pch_object}
diff --git a/backend/src/backend/program.cpp b/backend/src/backend/program.cpp
index 40adc1d..22c6b0d 100644
--- a/backend/src/backend/program.cpp
+++ b/backend/src/backend/program.cpp
@@ -576,13 +576,14 @@ namespace gbe {
             *errSize = snprintf(err, stringSize, "Invalid build option: %s\n", str.c_str());
           return false;
         }
-        continue;
       }
       useless.push_back(str);
       args.push_back(str.c_str());
     }
-    if (useDefaultCLCVersion)
+    if (useDefaultCLCVersion) {
       args.push_back("-D__OPENCL_C_VERSION__=120");
+      args.push_back("-cl-std=CL1.2");
+    }
     args.push_back("-mllvm");
     args.push_back("-inline-threshold=200000");
 #ifdef GEN7_SAMPLER_CLAMP_BORDER_WORKAROUND
@@ -775,6 +776,7 @@ namespace gbe {
           "-cl-single-precision-constant",
 //        "-cl-denorms-are-zero",
           "-cl-fast-relaxed-math",
+          "-cl-std=CL1.1"
       };
       const char * incompatible_defs[] = {
           "GET_FLOAT_WORD",
@@ -804,6 +806,10 @@ namespace gbe {
       if (p)
         optLevel = 0;
 
+      #define ENABLE_CL_KHR_FP64_STR "#pragma OPENCL EXTENSION cl_khr_fp64 : enable\n"
+      if (!strstr(const_cast<char *>(options), "-cl-std=CL1.1"))
+        fwrite(ENABLE_CL_KHR_FP64_STR, strlen(ENABLE_CL_KHR_FP64_STR), 1, clFile);
+
       clOpt += options;
     }
 
-- 
1.8.3.2