[Cmake] Cross compilation support for Unix

[Nitin Gupta]

Hi,
	I have done the same succeffully (so far) by writting
	a <cross-target>.cmake file in Modules/Platform. This 
	file overrides all the Cache Values e.g. compiler name,
	flags etc.
	Initially I tested the stuff by including 
	Modules/Platform/<cross-target.cmake> at the top of all of my 
	CMakeLists.txt file. The project build would work file, 
	though the CMake would Check the the native gcc as working compiler.
	However the <corss-target.cmake> file would FORCE all the 
	cache entries hence the configurations done after its inclusion 
	worked well.

	Later I modified the PROJECT command as 
	PROJECT(projectname [TARGET_ARCH <cross-target>] [LANG1 LANG2..]).
	Now the PROJECT command includes 
	Modules/Platform/<coss-target>.cmake soon after setting the 
	project name(and before doing EnableLanguage). The CMake now 
	picks the correct cross compiler even while "Checking for 
	working C compiler" and the corresponding TRY_COMPILE 
	(in CMakeTestCCompiler.cmake)	passes.

Regards,
Nitin

> -----Original Message-----
> From: cmake-admin at www . cmake . org [mailto:cmake-admin at www . cmake . org]On
> Behalf Of Andy Cedilnik
> Sent: Wednesday, August 06, 2003 12:13 AM
> To: Petr Ferschmann
> Cc: cmake at www . cmake . org
> Subject: Re: [Cmake] Cross compilation support for Unix
> 
> 
> Hi Petr,
> 
> Unfortunately not yet.
> 
> The issues are with the try_compile etc. 
> 
> In order to solve this, we will have to separate host environment and
> target environment. Then you will specify the host compiler and target
> compiler. This is unfortunately feature for after 1.8.
> 
> That said, you can cross compile using CMake. The only thing is that you
> have to provide all the answers to all try compiles.
> 
> For example, let say you want to compile Hello World on i32 Linux for
> Agenda Vr3, which runs Linux on MIPSel. 
> 
> You would run cmake on your project, check all the cache values and set
> them accordingly. So, compiler will be mipsel-gcc instead of gcc, ...
> 
> Lots of work though. There were limited successes on the list. Check
> history.
> 
> 			Andy
> 
> On Tue, 2003-08-05 at 13:04, Petr Ferschmann wrote:
> > it is possible in CMake to cross compile for another platform? 
> 
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