CMake AMRCC + custom linker

Question

I\'m trying to use cmake in a project which is compiled using armcc, but use a custom proprietary linker (not armlink).

Answer 1

That's exactly the use case of a relatively new (version 3.6) global CMake variable named CMAKE_TRY_COMPILE_TARGET_TYPE. So just add the following to your toolchain file:

set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)

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Edit: If your custom linker also gives you trouble outside the compiler check, simply split your toolchain into 2 files (toolchain.cmake to be read before and makerules.cmake after the CMake's compiler detection):

toolchain.cmake

[...]
set (CMAKE_USER_MAKE_RULES_OVERRIDE "${CMAKE_CURRENT_LIST_FILE}/makerules.cmake")

makerules.cmake

set (CMAKE_C_LINK_EXECUTABLE "<CMAKE_LINKER> <CMAKE_EXE_LINKER_FLAGS> <OBJECTS> <LINK_LIBRARIES> -o <TARGET>")
set (CMAKE_CXX_LINK_EXECUTABLE "<CMAKE_LINKER> <CMAKE_EXE_LINKER_FLAGS> <OBJECTS> <LINK_LIBRARIES> -o <TARGET>")

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Refrences

• CMAKE_USER_MAKE_RULES_OVERRIDE
• Change default value of CMAKE_CXX_FLAGS_DEBUG and friends in CMake
• CMake: In which Order are Files parsed (Cache, Toolchain, …)?

Answer 2

Apparently this is a bug in the cmake's armcc support, so I will keep my change in the ARMCC.cmake file.