[CMake] Response files not working with TI compilers

[R, Manoj]

When will these changes be available in the official version of cmake.
I also made similar changes. I am suing 3.8 version of the CMake and the issue is not fixed.

Regards

Manoj R

From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of Arturo Crespo
Sent: Wednesday, January 11, 2017 9:02 PM
To: cmake at cmake.org
Subject: [CMake] Response files not working with TI compilers

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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