[Beignet] [PATCH] add support for cross compiler

[Guo, Yejun]

Ok. 

And also write the basic info here for your convenient.

When build beignet with yocto build system, do the configure phase with the following cmake options.
    cmake \
		.. \
		-DCMAKE_LIBRARY_PATH=${TMPDIR}/sysroots/.../usr/ \
		-DCMAKE_INCLUDE_PATH=${TMPDIR}/sysroots/.../usr/ \
		-DCMAKE_BINARY_PATH=${TMPDIR}/sysroots/.../usr/bin/ \
		-D...
		-DCMAKE_SKIP_RPATH=TRUE

Thanks
Yejun

-----Original Message-----
From: Zhigang Gong [mailto:zhigang.gong at linux.intel.com] 
Sent: Monday, April 28, 2014 10:52 AM
To: Guo, Yejun
Cc: beignet at lists.freedesktop.org
Subject: Re: [Beignet] [PATCH] add support for cross compiler

The patch LGTM, will push latter.
could you write another patch to update the document to describe how to use this new feature? Thanks.

On Thu, Apr 24, 2014 at 02:18:00AM +0800, Guo Yejun wrote:
> Signed-off-by: Guo Yejun <yejun.guo at intel.com>
> ---
>  CMake/FindLLVM.cmake       | 2 +-
>  backend/src/CMakeLists.txt | 8 ++++----
>  2 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/CMake/FindLLVM.cmake b/CMake/FindLLVM.cmake index 
> 97ee7db..556b3a9 100644
> --- a/CMake/FindLLVM.cmake
> +++ b/CMake/FindLLVM.cmake
> @@ -84,7 +84,7 @@ endif (LLVM_VERSION_NODOT VERSION_GREATER 34)  
> macro(add_one_lib name)
>    FIND_LIBRARY(CLANG_LIB
>      NAMES ${name}
> -    PATHS ${LLVM_LIBRARY_DIR} )
> +    PATHS ${LLVM_LIBRARY_DIR} NO_DEFAULT_PATH)
>    set(CLANG_LIBRARIES ${CLANG_LIBRARIES} ${CLANG_LIB})
>  	unset(CLANG_LIB CACHE)
>  endmacro()
> diff --git a/backend/src/CMakeLists.txt b/backend/src/CMakeLists.txt 
> index 6d0cfa8..2d59644 100644
> --- a/backend/src/CMakeLists.txt
> +++ b/backend/src/CMakeLists.txt
> @@ -58,8 +58,8 @@ set (clang_cmd ${clang_cmd} -fno-builtin 
> -DGEN7_SAMPLER_CLAMP_BORDER_WORKAROUND)
>  add_custom_command(
>       OUTPUT ${pch_object}
>       COMMAND rm -f ${pch_object}
> -     COMMAND clang ${clang_cmd} --relocatable-pch -emit-pch -isysroot ${CMAKE_CURRENT_BINARY_DIR} ${ocl_blob_file} -o ${pch_object}
> -     COMMAND clang ${clang_cmd} -emit-pch ${ocl_blob_file} -o ${local_pch_object}
> +     COMMAND ${CMAKE_BINARY_PATH}clang ${clang_cmd} --relocatable-pch -emit-pch -isysroot ${CMAKE_CURRENT_BINARY_DIR} ${ocl_blob_file} -o ${pch_object}
> +     COMMAND ${CMAKE_BINARY_PATH}clang ${clang_cmd} -emit-pch 
> + ${ocl_blob_file} -o ${local_pch_object}
>       DEPENDS ${ocl_blob_file}
>       )
>  
> @@ -71,14 +71,14 @@ macro(ll_add_library ll_lib ll_sources)
>    add_custom_command(
>         OUTPUT  ${ll}.bc
>         COMMAND rm -f ${ll}.bc
> -       COMMAND llvm-as -o ${ll}.bc ${GBE_SOURCE_DIR}/src/${ll}
> +       COMMAND ${CMAKE_BINARY_PATH}llvm-as -o ${ll}.bc 
> + ${GBE_SOURCE_DIR}/src/${ll}
>         DEPENDS ${ll}
>         )
>    set (ll_objects ${ll_objects} ${ll}.bc)
>    endforeach (ll ${ll_sources})
>    add_custom_command(
>         OUTPUT ${ll_lib}
> -       COMMAND llvm-link -o ${ll_lib} ${ll_objects}
> +       COMMAND ${CMAKE_BINARY_PATH}llvm-link -o ${ll_lib} 
> + ${ll_objects}
>         DEPENDS ${ll_objects}
>         )
>    add_custom_target(${ll_lib}
> --
> 1.8.3.2
> 
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