[CMake] cross-compiling / host compiling

[Michael Wild]

On 3. Jun, 2010, at 14:09 , Alexander Neundorf wrote:

> On Wednesday 02 June 2010, Aeschbacher, Fabrice wrote:
>> [Sorry if this message is posted twice, but first was before I subscribed
>> to the list, so I'm not sure it was not rejected]
>> 
>> 
>> Hi,
>> 
>> [using cmake 2.8.1]
>> 
>> I have a project where almost every sub-dirs should be cross-compiled
>> (arm-linux-gnuueabi-gcc), but one directory containing a tool which must be
>> compiled on the host (gcc) first.
>> 
>> Can you give me a hint about the best way to achieve this with cmake?
> 
> They need to be compiled separately.
> With cmake, one buildtree is always one toolchain, using more than one 
> toolchain in one buildtree is not supported.
> 
> So you first need to build the tool in a native build tree, and then build the 
> rest in a cross compiling tree.
> You may want to "export" the tool from the native buildtree and "import" it 
> again in the cross compiling tree.
> 
> Alex

Or use an ExternalProject_Add for the native tool and then do an ADD_EXECUTABLE(tool IMPORTED) in the cross compiling top-level project.

Michael