Signed-off-by: Guo Yejun <yejun....@intel.com> --- docs/howto/oldgcc-howto.mdwn | 58 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 docs/howto/oldgcc-howto.mdwn
diff --git a/docs/howto/oldgcc-howto.mdwn b/docs/howto/oldgcc-howto.mdwn new file mode 100644 index 0000000..72e3537 --- /dev/null +++ b/docs/howto/oldgcc-howto.mdwn @@ -0,0 +1,58 @@ +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 -- 1.9.1 _______________________________________________ Beignet mailing list Beignet@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/beignet
