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Old Gcc Support HowTo
====================

Beignet GBE compiler requires C++11 features, while some platforms does not provide
such with an old gcc version. The solution is to build a standalone GBE compiler in
a feasible system, and then build Beignet with the pre-built standalone compiler.
The standalone compiler is also needed during OpenCL application development. Here
are the brief steps.

Build standalone GBE compiler in a system supporting C++11 features
-------------------------------------------------------------------

The build process is as usual except to add a CMake option "-DBUILD_STANDALONE_GBE_COMPILER=true".
After build finishes, there is a tar ball at your_build_dir/backend/src/libocl/usr/local/lib/beignet/gbecompiler.tgz,
this is the standalone compiler package that will be used next.


Distribute the package to your target system without C++11 features
-------------------------------------------------------------------

Copy gbecompiler.tgz into your target system, the preference location is /usr/local/lib/beignet,
and unzip it.
tar zxvf gbecompiler.tgz

Please check there are following files and directory at /usr/local/lib/beignet/ after unzip:
beignet.bc  beignet.pch  gbe_bin_generater  include


Build Beignet on your target system with the standalone compiler
-------------------------------------------------------------------

The build process is as usual except to add a CMake option "-DUSE_STANDALONE_GBE_COMPILER=true",

If your_path_for_compiler is not /usr/local/lib/beignet, just need to add another CMake option
"-DSTANDALONE_GBE_COMPILER_DIR=/your_path_for_compiler/".


Develop OpenCL applications on your target machine
--------------------------------------------------

Firstly, write OpenCL kernel source code, secondly, compile the kernel source code to
kernel binary with the standalone compiler gbe_bin_generater (see the usage below), finally,
invoke clCreateProgramWithBinary to load the kernel binary and execute it. The utest case
load_program_from_bin_file demos the whole procedure.

gbe_bin_generater INFILE [-pbuild_parameter] -oOUTFILE -tGEN_PCI_ID

For example, the following command builds OpenCL source kernel from file 'mykernel.cl'
for Ivybridge with pci_id 0x0162, and write the result (executable binary kernel)
into file 'mykernel.bin'.

gbe_bin_generater mykernel.cl -omykernel.bin -t0x0162

If the standalone compiler is not located at /usr/local/lib/beignet, need to set the below
environment to execute gbe_bin_generater.
OCL_BITCODE_LIB_PATH=/your_path_for_compiler/beignet.bc
OCL_HEADER_FILE_DIR=/your_path_for_compiler/include
OCL_PCH_PATH=/your_path_for_compiler/beignet.pch