How to force CMake to use linker instead of compiler during linking

Question

I'm using CMake with the TI compiler (cl6x). The goal is to create a shared object. The compiler is used correctly to create object files, but during linking, CMake defaults to using the compiler (cl6x) to combine all object files into one binary.

cl6x    -shared -Wl,-soname,libwhatever.so -o libwhatever.so CMakeFiles/whatever.dir/__/whatever.c.o

While this is fine with gcc, in this case, I require a call to lnk6x instead.

I use add_library(whatever SHARED ${whatever_srcs}) to generate the *.so. I also set:

set(CMAKE_LINKER "path/to/lnk6x")
set(CMAKE_C_LINK_EXECUTABLE "<CMAKE_LINKER> <FLAGS> <CMAKE_C_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")

And I issue:

cmake .. -DCMAKE_C_COMPILER=cl6x -DCMAKE_SYSTEM_NAME=Generic 

Short of issuing a custom command, is there a way around this?