cmake: clang: Add the runtime library to the link command
When building with clang symbols from the runtime library, like __divdi3 were not being resolved. To fix this we add the "library path for the currently used compiler runtime library" to the link path. Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
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@ -33,5 +33,20 @@ 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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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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set(CMAKE_REQUIRED_FLAGS -nostartfiles -nostdlib ${isystem_include_flags} -Wl,--unresolved-symbols=ignore-in-object-files)
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string(REPLACE ";" " " CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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