[CMake] [Dev] CMake 2.5 tool chain support example

[Alexander Neundorf]

Hi Trevor,

On Saturday 16 June 2007 11:27, Trevor Kellaway wrote:
> Alex,
>
> > Please update to current cvsand use "Generic" as
> > CMAKE_SYSTEM_NAME, there is now a Generic.cmake in cmake.
> >
> > ...
> >
> > > > SET (CMAKE_C_OUTPUT_EXTENSION 	".o" 	CACHE STRING "C ...")
> > > > SET (CMAKE_CXX_OUTPUT_EXTENSION	".o"    CACHE STRING "C++ ...")
> > > >
> > > >
> > > > Let me see if I find a way to define this later.
> > > >
> > > >
> > > > SET (CMAKE_C_COMPILER_ID_RUN	TRUE)
> > > > SET (CMAKE_CXX_COMPILER_ID_RUN 	TRUE)
> >
> > SET (CMAKE_C_OUTPUT_EXTENSION 	".o" 	CACHE STRING "C ...")
> > SET (CMAKE_CXX_OUTPUT_EXTENSION	".o"    CACHE STRING "C++ ...")
> > SET (CMAKE_C_COMPILER_WORKS 	TRUE)
> > SET (CMAKE_CXX_COMPILER_WORKS 	TRUE)
> > ...
> > SET (CMAKE_SIZEOF_VOID_P 2)
> > SET (HAVE_CMAKE_SIZEOF_VOID_P TRUE)
> >
> > With current cvs you should be able to move the 6 variables
> > above into Generic-chc12.cmake.
> > The _ID_RUN variables still have to stay in the toolchain file.
>
> Moved values as above and tried rebuilding with cmake version
> 2.5-20070615 and all is OK (example project tree attached FYI).
>
> Note, I'm still using "Freescale" for CMAKE_SYSTEM_NAME rather than
> "Generic", as I still think this makes more sense to avoid potential
> clashes of compiler names from different embedded compiler vendors. A
> side benefit is its much easier for a user to spot their vendor's
> compiler by vendor name rather than having to find what the compiler is
> called.

Please have a look at the attached file and put it into your cmake/Modules/ 
directory and let me know what you think.

It includes three simple macros, with these you can change your toolchain file 
to:

include(CMakeForceCompiler)

# force system name, version and processor
cmake_force_system("Generic" "1.0" "hc12")

# this one sets the compiler to "chc12", the sizeof(void) to 2
# and the "compiler id" to "FreescaleCHC12". 
# With a compiler id cmake will try to load
# ${CMAKE_SYSTEM_NAME}-${ID}-C.cmake for C and
# ${CMAKE_SYSTEM_NAME}-${ID}-CXX.cmake for C++
cmake_force_c_compiler(chc12 FreescaleCHC12 2)

# same for C++, the size is not needed here
cmake_force_cxx_compiler(chc12 FreescaleCHC12)

-------------------------------------------------------------

Can't you move the following three also in the toolchain file ?
If they are already in the cache, you could try the FORCE option.
SET (HC12_PIPER   "piper" CACHE STRING "Freescale tool...")
SET (CMAKE_AR     "libmaker" CACHE STRING "Tool chain library archiver")
SET (CMAKE_LINKER "linker"   CACHE STRING "Tool chain linker")

Alex
-------------- next part --------------
MACRO(CMAKE_FORCE_SYSTEM name version proc)
   SET(CMAKE_SYSTEM_NAME "${name}")
   SET(CMAKE_SYSTEM_VERSION "${version}")
   SET(CMAKE_SYSTEM_PROCESSOR "${proc}")
ENDMACRO(CMAKE_FORCE_SYSTEM)

MACRO(CMAKE_FORCE_C_COMPILER compiler id sizeof_void)
  SET(CMAKE_C_COMPILER "${compiler}")
  SET(CMAKE_C_COMPILER_ID_RUN TRUE)
  SET(CMAKE_C_COMPILER_ID ${id})
  SET(CMAKE_C_COMPILER_WORKS TRUE)
  SET(CMAKE_SIZEOF_VOID_P ${sizeof_void} CACHE STRING "sizeof void")
  SET(HAVE_CMAKE_SIZEOF_VOID_P TRUE CACHE INTERNAL "have sizeof void")
ENDMACRO(CMAKE_FORCE_C_COMPILER)

MACRO(CMAKE_FORCE_CXX_COMPILER compiler id)
  SET(CMAKE_CXX_COMPILER "${compiler}")
  SET(CMAKE_CXX_COMPILER_ID_RUN TRUE)
  SET(CMAKE_CXX_COMPILER_ID ${id})
  SET(CMAKE_CXX_COMPILER_WORKS TRUE)
ENDMACOo(CMAKE_FORCE_CXX_COMPILER)