[CMake] Support for cross compiling

[Mark Jonas]

Hi,

I am currently testing if CMake would be a usable build system for my
embedded C, C++ and assembly language project.
My first target compiler will be a cross gcc but I need to get CMake
to work with IAR and Green Hills compilers, too.

I found CMAKE_FORCE_C_COMPILER() and CMAKE_FORCE_CXX_COMPILER() to
force a different compiler. But how do I tell CMake about different
archivers, assemblers and linkers?

Is this a reasonable way to teach CMake to handle assembly language files?

FOREACH(src ${ASM_SRCS})
   GET_FILENAME_COMPONENT(SRC_NAME ${src} NAME)
   SET(ASM_SRC ${CMAKE_CURRENT_SOURCE_DIR}/${src})
   SET(ASM_OBJ ${CMAKE_CURRENT_BINARY_DIR}/${SRC_NAME}.o)
   STRING(TOUPPER ${CMAKE_BUILD_TYPE} BTYPE)
   SET(ASM_FLAGS ${CMAKE_C_FLAGS})
   SET(ASM_FLAGS ${ASM_FLAGS} ${CMAKE_C_FLAGS_${BTYPE}})
   SEPARATE_ARGUMENTS(ASM_FLAGS)
   ADD_CUSTOM_COMMAND(
      OUTPUT ${ASM_OBJ}
      DEPENDS ${ASM_SRC}
      COMMAND ${MY_ASM_COMPILER}
      ARGS -c ${ASM_FLAGS} -o ${ASM_OBJ} ${ASM_SRC}
   )
   SET(ASM_OBJS ${ASM_OBJS} ${ASM_OBJ})
ENDFOREACH(src)

ADD_EXECUTABLE( ${EXENAME} ${SRCS} ${ASM_OBJS} )

Can this be done better?

Is there already assembly language support in CMake and I did not look
closely enough?

TIA,
Mark