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llvm-mirror/cmake/modules/CrossCompile.cmake
Petr Hosek 7f6e32fff6 [CMake] Support for cross-compilation when build runtimes
When cross-compiling, we cannot use the just built toolchain, instead
we need to use the host toolchain which we assume has a support for
targeting the selected target platform. We also need to pass the path
to the native version of llvm-config to external projects.

Differential Revision: https://reviews.llvm.org/D41678

llvm-svn: 322046
2018-01-08 23:50:59 +00:00

70 lines
2.9 KiB
CMake

function(llvm_create_cross_target_internal target_name toolchain buildtype)
if(NOT DEFINED LLVM_${target_name}_BUILD)
set(LLVM_${target_name}_BUILD "${CMAKE_BINARY_DIR}/${target_name}")
set(LLVM_${target_name}_BUILD ${LLVM_${target_name}_BUILD} PARENT_SCOPE)
message(STATUS "Setting native build dir to " ${LLVM_${target_name}_BUILD})
endif(NOT DEFINED LLVM_${target_name}_BUILD)
if (EXISTS ${LLVM_MAIN_SRC_DIR}/cmake/platforms/${toolchain}.cmake)
set(CROSS_TOOLCHAIN_FLAGS_INIT
-DCMAKE_TOOLCHAIN_FILE=\"${LLVM_MAIN_SRC_DIR}/cmake/platforms/${toolchain}.cmake\")
else()
set(CROSS_TOOLCHAIN_FLAGS_INIT
-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
)
endif()
set(CROSS_TOOLCHAIN_FLAGS_${target_name} ${CROSS_TOOLCHAIN_FLAGS_INIT}
CACHE STRING "Toolchain configuration for ${target_name}")
if (buildtype)
set(build_type_flags "-DCMAKE_BUILD_TYPE=${buildtype}")
endif()
if (LLVM_USE_LINKER AND NOT CMAKE_CROSSCOMPILING)
set(linker_flag "-DLLVM_USE_LINKER=${LLVM_USE_LINKER}")
endif()
if (LLVM_EXTERNAL_CLANG_SOURCE_DIR)
# Propagate LLVM_EXTERNAL_CLANG_SOURCE_DIR so that clang-tblgen can be built
set(external_clang_dir "-DLLVM_EXTERNAL_CLANG_SOURCE_DIR=${LLVM_EXTERNAL_CLANG_SOURCE_DIR}")
endif()
add_custom_command(OUTPUT ${LLVM_${target_name}_BUILD}
COMMAND ${CMAKE_COMMAND} -E make_directory ${LLVM_${target_name}_BUILD}
COMMENT "Creating ${LLVM_${target_name}_BUILD}...")
add_custom_target(CREATE_LLVM_${target_name}
DEPENDS ${LLVM_${target_name}_BUILD})
# Escape semicolons in the targets list so that cmake doesn't expand
# them to spaces.
string(REPLACE ";" "$<SEMICOLON>" targets_to_build_arg
"${LLVM_TARGETS_TO_BUILD}")
string(REPLACE ";" "$<SEMICOLON>" experimental_targets_to_build_arg
"${LLVM_EXPERIMENTAL_TARGETS_TO_BUILD}")
add_custom_command(OUTPUT ${LLVM_${target_name}_BUILD}/CMakeCache.txt
COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}"
-DCMAKE_MAKE_PROGRAM="${CMAKE_MAKE_PROGRAM}"
${CROSS_TOOLCHAIN_FLAGS_${target_name}} ${CMAKE_SOURCE_DIR}
-DLLVM_TARGET_IS_CROSSCOMPILE_HOST=TRUE
-DLLVM_TARGETS_TO_BUILD="${targets_to_build_arg}"
-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="${experimental_targets_to_build_arg}"
-DLLVM_DEFAULT_TARGET_TRIPLE="${TARGET_TRIPLE}"
-DLLVM_TARGET_ARCH="${LLVM_TARGET_ARCH}"
${build_type_flags} ${linker_flag} ${external_clang_dir}
WORKING_DIRECTORY ${LLVM_${target_name}_BUILD}
DEPENDS CREATE_LLVM_${target_name}
COMMENT "Configuring ${target_name} LLVM...")
add_custom_target(CONFIGURE_LLVM_${target_name}
DEPENDS ${LLVM_${target_name}_BUILD}/CMakeCache.txt)
endfunction()
function(llvm_create_cross_target target_name sysroot)
llvm_create_cross_target_internal(${target_name} ${sysroot} ${CMAKE_BUILD_TYPE})
endfunction()
llvm_create_cross_target_internal(NATIVE "" Release)