[CMake] Toolchain with non-gcc argument format

[oliver.zabel at egoproducts.com]

Hi, 

i have some modules which i want to cross-compile for different platforms 
which uses different compilers. One of them for example is the arm-gcc 
compiler which works over the toolchain file. 
Now i have a Renesas RX compiler which uses for example instead of "-I" 
for include paths the argument "-include=". So using this toolchain fails 
because cmake trys to use gcc arguments.

I managed to compile my modules with the following approache:

set(CMAKE_C_COMPILER_WORKS 1)
project(MyModule C)
cmake_minimum_required(VERSION 3.0)

set(EXECUTABLE_NAME MyModule)
set(SRC_FILES
        ${PROJECT_SOURCE_DIR}/module.c
        ${PROJECT_SOURCE_DIR}/main.c
)

IF(RXCOMPILER)
  MESSAGE(STATUS "RX Mode")
  add_custom_target(dummy_target ALL DEPENDS EXECUTABLE_NAME)
 
  ADD_CUSTOM_COMMAND( 
    OUTPUT    EXECUTABLE_NAME
    COMMAND   ${CMAKE_C_COMPILER}
    ARGS      -output=obj=abs -cpu=rx200 -lang=c99 -goptimize -size 
${SRC_FILES}
    COMMENT   "RX Compiler"
  )
ELSE(RXCOMPILER)

        add_executable(EXECUTABLE_NAME ${SRC_FILES})
 
ENDIF(RXCOMPILER)

Is there a better way of doing this? For example telling cmake to use 
"-include=" instaed of "-I"?

Thanks for your help!

Best regards, 
oliver
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