[CMake] CMake Digest, Vol 49, Issue 24

[Yinyin]

> On Monday 05 May 2008, Yinyin wrote:
> > The attached file (multi-toolchain.patch.bz2) is a patch I made for
> > supporting multiple tool-chain in single source tree.
> > The idea is add an extra property "TARGET_ARCH" to target
> > and make the variable expansion routine lookup toolchain according to
> > TARGET_ARCH.
> > For example, if TARGET_ARCH is set as CPUX (ie:
> > SET_TARGET_PROPERTIES(my_target  PROPERTIES  TARGET_ARCH  CPUX) ), the
> > modified expansion routine will check CMAKE_C_COMPILER_CPUX first when
> > cmake attempts to generate statements which reference to C compiler.
> 
> The patch is not that small, so, I just ask...
> 
> How does it deal with CMakeCache.txt (which may contain different results for 
> different toolchains) ?

in CMakeCache.txt , there will have additional entries for extra tool-chains.

for example, in CMakeCache.txt of Cell HelloWorld, there are:
{{{
CMAKE_C_COMPILER:FILEPATH=/opt/cell/toolchain/bin/ppu-gcc

//The path of SPU targeted C compiler
CMAKE_C_COMPILER_SPU256K:STRING=/opt/cell/toolchain/bin/spu-gcc

//Rule for compiling C source into object code
CMAKE_C_COMPILE_OBJECT_SPU256K:STRING=<CMAKE_C_COMPILER> <DEFINES>  -march=cell -mtune=cell -mea32  <FLAGS> -o <OBJECT>   -c <SOURCE>
}}}

The 1st one comes for the "default" tool-chain.

The 2nd and 3rd come for the "additional" tool-chain.


These additional entries are added by toolchain file (or module included by toolchain file).


For CellBE / PS3 -

In the files I uploaded, there is a module named  "UseCellBESDK3.cmake" and contained in "cellsdk3_cmake_modules.tar.bz2".

This module would declare the rules and provide additional cmake functions to support the build process for CellBE / PS3.




> What does it do with the CMakeFiles/ directory (which may contain different 
> object files for different toolchains) ?

In this patch, the additional tool-chain will not be tested,

so, there is nothing to do with CMakeFiles/.


This might cause some problems if the build process would rely on the testing result.

I am trying to figure out how to perform tool-chain tests and which tests are necessary.



> It would be really nice if we would get good PS3 support for cmake :-)

I cannot agree with you anymore :)



> Alex


BTW, here are the known issues -

- must supply tool-chain file on invoking cmake (ex: cmake -DCMAKE_TOOLCHAIN_FILE="../toolchain.cmake") 
  even on CellBE / PS3 platform itself

- bad module naming, should use something like "Linux-gcc-CBEA"

- do not test additional tool-chains





--
Yinyin






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