116 lines
3.7 KiB
CMake
116 lines
3.7 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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set_ifndef(C++ g++)
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# Configures CMake for using GCC, this script is re-used by several
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# GCC-based toolchains
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find_program(CMAKE_C_COMPILER ${CROSS_COMPILE}${CC} PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
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if(${CMAKE_C_COMPILER} STREQUAL CMAKE_C_COMPILER-NOTFOUND)
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message(FATAL_ERROR "C compiler ${CROSS_COMPILE}${CC} not found - Please check your toolchain installation")
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endif()
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if(CONFIG_CPLUSPLUS)
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set(cplusplus_compiler ${CROSS_COMPILE}${C++})
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else()
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if(EXISTS ${CROSS_COMPILE}${C++})
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set(cplusplus_compiler ${CROSS_COMPILE}${C++})
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else()
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# When the toolchain doesn't support C++, and we aren't building
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# with C++ support just set it to something so CMake doesn't
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# crash, it won't actually be called
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set(cplusplus_compiler ${CMAKE_C_COMPILER})
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endif()
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endif()
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find_program(CMAKE_CXX_COMPILER ${cplusplus_compiler} PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
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set(NOSTDINC "")
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# Note that NOSYSDEF_CFLAG may be an empty string, and
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# set_ifndef() does not work with empty string.
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if(NOT DEFINED NOSYSDEF_CFLAG)
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set(NOSYSDEF_CFLAG -undef)
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endif()
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foreach(file_name include/stddef.h include-fixed/limits.h)
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} --print-file-name=${file_name}
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OUTPUT_VARIABLE _OUTPUT
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)
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get_filename_component(_OUTPUT "${_OUTPUT}" DIRECTORY)
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string(REGEX REPLACE "\n" "" _OUTPUT "${_OUTPUT}")
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list(APPEND NOSTDINC ${_OUTPUT})
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endforeach()
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include(${ZEPHYR_BASE}/cmake/gcc-m-cpu.cmake)
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if("${ARCH}" STREQUAL "arm")
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include(${ZEPHYR_BASE}/cmake/compiler/gcc/target_arm.cmake)
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elseif("${ARCH}" STREQUAL "arc")
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list(APPEND TOOLCHAIN_C_FLAGS
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-mcpu=${GCC_M_CPU}
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)
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elseif("${ARCH}" STREQUAL "riscv")
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include(${CMAKE_CURRENT_LIST_DIR}/target_riscv.cmake)
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elseif("${ARCH}" STREQUAL "x86")
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include(${CMAKE_CURRENT_LIST_DIR}/target_x86.cmake)
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endif()
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if(NOT no_libgcc)
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# This libgcc code is partially duplicated in compiler/*/target.cmake
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} ${TOOLCHAIN_C_FLAGS} --print-libgcc-file-name
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OUTPUT_VARIABLE LIBGCC_FILE_NAME
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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assert_exists(LIBGCC_FILE_NAME)
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get_filename_component(LIBGCC_DIR ${LIBGCC_FILE_NAME} DIRECTORY)
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assert_exists(LIBGCC_DIR)
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LIST(APPEND LIB_INCLUDE_DIR "-L\"${LIBGCC_DIR}\"")
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LIST(APPEND TOOLCHAIN_LIBS gcc)
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endif()
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if(SYSROOT_DIR)
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# The toolchain has specified a sysroot dir that we can use to set
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# the libc path's
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} ${TOOLCHAIN_C_FLAGS} --print-multi-directory
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OUTPUT_VARIABLE NEWLIB_DIR
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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set(LIBC_LIBRARY_DIR "\"${SYSROOT_DIR}\"/lib/${NEWLIB_DIR}")
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endif()
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# For CMake to be able to test if a compiler flag is supported by the
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# toolchain we need to give CMake the necessary flags to compile and
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# link a dummy C file.
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#
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# CMake checks compiler flags with check_c_compiler_flag() (Which we
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# wrap with target_cc_option() in extentions.cmake)
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foreach(isystem_include_dir ${NOSTDINC})
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list(APPEND isystem_include_flags -isystem "\"${isystem_include_dir}\"")
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endforeach()
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# The CMAKE_REQUIRED_FLAGS variable is used by check_c_compiler_flag()
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# (and other commands which end up calling check_c_source_compiles())
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# to add additional compiler flags used during checking. These flags
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# are unused during "real" builds of Zephyr source files linked into
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# the final executable.
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#
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# Appending onto any existing values lets users specify
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# toolchain-specific flags at generation time.
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list(APPEND CMAKE_REQUIRED_FLAGS
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-nostartfiles
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-nostdlib
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${isystem_include_flags}
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-Wl,--unresolved-symbols=ignore-in-object-files
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-Wl,--entry=0 # Set an entry point to avoid a warning
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)
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string(REPLACE ";" " " CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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