One question about gcc fix_includes

[He Yunlong-B20256]

Hi, Kai & Andrew,

	Anyway, for one cross-compiler, even building gcc causes to
"fix" header files again, the header files should be from the
cross-compiler itself, instead of /usr/include, is it right?

	If possible, I think gcc build process should be updated as:

	1. use header files from cross-compiler.   (Does current gcc
support this? How to do?)
	2. if the headerfiles have been fixed already, skip fixing and
copy them directly.

B.R.
Harry

> -----Original Message-----
> From: Kai Ruottu [mailto:kai.ruottu@wippies.com] 
> Sent: Wednesday, December 02, 2009 5:46 PM
> To: He Yunlong-B20256
> Cc: gcc-help@gcc.gnu.org
> Subject: Re: One question about gcc fix_includes
> 
> He Yunlong-B20256 wrote:
> > Hi, Experts,
> >
> > 	We are using one cross-compiler to compile native gcc, 
> in out test, 
> > we found that gcc will created "fixed includes" from host 
> glibc header 
> > files, I think they should come from the header files inside of the 
> > cross-compiler, can anyone confirm that?
> >   
> 
> Ok, maybe the headers could be fixed once again - they were 
> already fixed during the cross- compiler build - but why?  
> Maybe all the target libraries could be built again - they 
> were already built during the cross-compiler build - but why?
> 
> I myself have never thought that in a Canadian Cross these 
> tasks should be done again, I have only produced the required 
> executables for the new $host and been happy with them alone...
> 
> Nowadays the majority of the by GCC-build produced $target 
> stuff resides in :
> 
>     $prefix/lib/gcc/$target/$gcc-version
> 
> separate from the primary $host ($build host) stuff in :
> 
>     $prefix/libexec/gcc/$target/$gcc-version
> 
> including the fixed target headers in 'include-fixed'.  So 
> what is the problem with just copying this directory "as it 
> is" onto the secondary $host ?
> 
> Furthermore the GCC install wouldn't copy the binutils 
> neither the target C libraries onto the another, 'secondary', 
> $host,  so in any case there will be some manual 
> work :(   What to
> automatize and what not, that's the question...
> 
> Generally in some cases like those handling two "full 
> systems"  like Linux and Solaris, cross- producing tools for 
> another, could benefit from pre-installing the stuff onto the 
> $build system for easy tarballing, ie installing it onto the 
> already existing $sysroot made for the "native"
> stuff like its base C library.  But should the stuff be 
> produced first again with the cross-compiler or simply be 
> copied from the cross-compiler?
> 
>