zephyr/cmake/target_toolchain_flags.cmake

38 lines
2.0 KiB
CMake

# Uniquely identify the toolchain wrt. it's capabilities.
#
# What we are looking for, is a signature definition that is defined
# like this:
# * The MD5 sum of the compiler itself. A MD5 checksum is taken of the content
# after symlinks are resolved. This ensure that if the content changes, then
# the MD5 will also change (as example toolchain upgrade in same folder)
# * The CMAKE_C_COMPILER itself. This may be a symlink, but it ensures that
# multiple symlinks pointing to same executable will generate different
# signatures, as example: clang, gcc, arm-zephyr-eabi-gcc, links pointing to
# ccache will generate unique signatures
# * CMAKE_C_COMPILER_ID is taking the CMake compiler id for extra signature.
# * CMAKE_C_COMPILER_VERSION will ensure that even when using the previous
# methods, where an upgraded compiler could have same signature due to ccache
# usage and symbolic links, then the upgraded compiler will have new version
# and thus generate a new signature.
#
# Toolchains with the same signature will always support the same set of flags.
#
file(MD5 ${CMAKE_C_COMPILER} CMAKE_C_COMPILER_MD5_SUM)
set(TOOLCHAIN_SIGNATURE ${CMAKE_C_COMPILER_MD5_SUM})
# Extend the CMAKE_C_COMPILER_MD5_SUM with the compiler signature.
string(MD5 COMPILER_SIGNATURE ${CMAKE_C_COMPILER}_${CMAKE_C_COMPILER_ID}_${CMAKE_C_COMPILER_VERSION})
set(TOOLCHAIN_SIGNATURE ${TOOLCHAIN_SIGNATURE}_${COMPILER_SIGNATURE})
# Loading of templates are strictly not needed as they does not set any
# properties.
# They purely provides an overview as well as a starting point for supporting
# a new toolchain.
include(${CMAKE_CURRENT_LIST_DIR}/compiler/compiler_flags_template.cmake)
include(${CMAKE_CURRENT_LIST_DIR}/linker/linker_flags_template.cmake)
# Configure the toolchain flags based on what toolchain technology is used
# (gcc, host-gcc etc.)
include(${TOOLCHAIN_ROOT}/cmake/compiler/${COMPILER}/compiler_flags.cmake OPTIONAL)
include(${TOOLCHAIN_ROOT}/cmake/linker/${LINKER}/linker_flags.cmake OPTIONAL)