4b94fc3da2
This patch adds Kconfig options to select either GNU libgcc or LLVM compiler-rt. The 'rtlib' flag is provided in a config file, so this patch introduces 'clang_libgcc.cfg' and 'clang_compiler_rt.cfg' which enable appropriate library. The file is selected by concatenating the 'clang_' prefix with library name. Signed-off-by: Patryk Duda <pdk@semihalf.com>
59 lines
1.5 KiB
CMake
59 lines
1.5 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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# See root CMakeLists.txt for description and expectations of these macros
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macro(toolchain_ld_base)
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if(NOT PROPERTY_LINKER_SCRIPT_DEFINES)
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set_property(GLOBAL PROPERTY PROPERTY_LINKER_SCRIPT_DEFINES -D__GCC_LINKER_CMD__)
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endif()
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# TOOLCHAIN_LD_FLAGS comes from compiler/gcc/target.cmake
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# LINKERFLAGPREFIX comes from linker/ld/target.cmake
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zephyr_ld_options(
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${TOOLCHAIN_LD_FLAGS}
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)
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zephyr_ld_options(
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${LINKERFLAGPREFIX},--gc-sections
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${LINKERFLAGPREFIX},--build-id=none
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)
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# Sort the common symbols and each input section by alignment
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# in descending order to minimize padding between these symbols.
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zephyr_ld_option_ifdef(
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CONFIG_LINKER_SORT_BY_ALIGNMENT
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${LINKERFLAGPREFIX},--sort-common=descending
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${LINKERFLAGPREFIX},--sort-section=alignment
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)
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if (NOT CONFIG_LINKER_USE_RELAX)
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zephyr_ld_options(
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${LINKERFLAGPREFIX},--no-relax
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)
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endif()
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if (CONFIG_LLVM_USE_LD)
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if(CONFIG_LIBGCC_RTLIB)
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set(runtime_lib "libgcc")
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elseif(CONFIG_COMPILER_RT_RTLIB)
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set(runtime_lib "compiler_rt")
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endif()
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zephyr_link_libraries(
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--config ${ZEPHYR_BASE}/cmake/toolchain/llvm/clang_${runtime_lib}.cfg
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)
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endif()
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if(CONFIG_CPP AND (CMAKE_C_COMPILER_ID STREQUAL "Clang"))
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# GNU ld complains when used with llvm/clang:
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# error: section: init_array is not contiguous with other relro sections
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#
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# So do not create RELRO program header.
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zephyr_link_libraries(
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-Wl,-z,norelro
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)
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endif()
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endmacro()
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