[CMake] Response files not working with TI compilers

[Arturo Crespo]

Dear All,

I'm currently using CMake-3.7.1 to build a big project with different TI
compilers (cl6x, armcl, cl-arp32)  and since several months ago I started
to use linker response files because the linker command line was too long
for Windows and the build was failing.

When I tried to do this for the first time I got a linker error with an
invalid flag being used, as the TI linker doesn't support response files
(-@)

The way CMake invokes the TI linker is as mentioned in the TI documentation
by invoking the compiler with an option to run the linker, i.e. cl6x
--run_linker [options] filename1, ..., filenameN, in TI-CXX.cmake:

set(CMAKE_CXX_LINK_EXECUTABLE "<CMAKE_CXX_COMPILER> --run_linker
--output_file=<TARGET> --map_file=<TARGET>.map <CMAKE_CXX_LINK_FLAGS>
<LINK_LIBRARIES> <LINK_FLAGS> <OBJECTS>")


The solution that I found was to change the order of the arguments passed
to the linker, because the TI compiler supports response files (-@) and it
passes that information to the linker, so by moving <OBJECTS> before
--run_linker the problem was solved:

set(CMAKE_CXX_LINK_EXECUTABLE "<CMAKE_CXX_COMPILER> <OBJECTS> --run_linker
--output_file=<TARGET> --map_file=<TARGET>.map <CMAKE_CXX_LINK_FLAGS>
<LINK_LIBRARIES> <LINK_FLAGS>")


The same change is needed in TI-C.cmake

This issue is present since at least since CMake-3.3.2

Regards,
Arturo
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