libcxxabi ExternalProject_Add

gistfile1.txt

ExternalProject_Add(libcxxabi
    DOWNLOAD_COMMAND ""
    BUILD_IN_SOURCE 0
    UPDATE_COMMAND ""
    CONFIGURE_COMMAND ${CMAKE_COMMAND} ${LLVM_SRC_DIR}/projects/libcxxabi
        -DCMAKE_TOOLCHAIN_FILE=${CMAKE_BINARY_DIR}/toolchain.cmake
        -DCMAKE_INSTALL_PREFIX=${TOOLCHAIN_DIR}
        -DCMAKE_BUILD_TYPE=MinSizeRel
        -DCMAKE_VERBOSE_MAKEFILE=${CMAKE_VERBOSE_MAKEFILE}
        -DLLVM_CONFIG_PATH=${TOOLCHAIN_DIR}/bin/llvm-config
        -DLIBCXXABI_SYSROOT=${TARGET_SYSROOT}
        -DLIBCXXABI_TARGET_TRIPLE=${TARGET_TRIPLE}
        -DLIBCXXABI_USE_COMPILER_RT=${BUILD_COMPILER_RT} # bypass gcc_s
)
add_dependencies(libcxxabi clang binutils)
if(BUILD_COMPILER_RT)
    add_dependencies(libcxxabi compiler-rt)
endif()



toolchain.cmake.in

SET(CMAKE_SYSTEM_VERSION 1)
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR @TARGET_ARCH@)

#compiler
SET(CMAKE_C_COMPILER @TOOLCHAIN_DIR@/bin/clang)
SET(CMAKE_CXX_COMPILER @TOOLCHAIN_DIR@/bin/clang++)

# sysroot
SET(CMAKE_SYSROOT @TARGET_SYSROOT@)
SET(CMAKE_FIND_ROOT_PATH @TARGET_SYSROOT@)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

# compiler flags
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -v -static -fuse-ld=gold")