Aw: Re: How to compile gcc toolchain with special sysroot correctly?

["Johannes Lorenz" <johannes89@mailueberfall.de>]

@Andrew:

I copied these crt*.o libraries, but now, it complains that it is missing stdio.h. I really guess it would be better to link to the whole old glibc. Is there any good trick to tell gcc: Search in your sysroot, but if you can not find it, try in "/usr/include" ? (somehow the opposite of "-I")

@Kai:

> Are you trying to build the target Linux system from scratch?  The 
> produced glibc runtime parts (shared
> libs) being installed onto the originally unexisting target system? If 
> not then your goal is "conceptually
> wrong"

I don't know what you mean, but I am trying to install glibc to another "root" on the same target system. I have gcc 4.4, but want to have 4.7 (on the same target), so I tried to compile a new toolchain in ~/local, using my gcc 4.4.

> In a simple Ubuntu 12.04 to OpenSuSE 12.2 cross compiler case using a 
> sysroot'ed glibc for the target system
> one of course would produce only the target binutils and the target GCC 
> for the $host (that usually being a
> totally different arch, different CPU, and system, for instance 
> Solaris2.10).

Ok, I don't want to compile to a different target. I only mentioned openSuSE to say that the versions of binutils, gcc and glibc work on "some system". But I just want to compile on $host for $host ;) Both are Ubuntu.

> If this isn't clear then one should ask : "Do people REALLY 
> replace the target C library in native
> binutils and GCC builds?"  It would sound "sane" to rebuild the system 
> glibc with the updated binutils and
> GCC afterwards, they are newer and should produce a better and quicker C 
> library, or how?  But please
> believe me, the native binutils and GCC builders don't try to replace 
> the target C library in '/lib*', '/usr/lib*',
> '/usr/include' etc. Neither all the X11 libraries in the system!  So why 
> on earth any cross GCC builder would
> do that if all the target libraries are already there, prebuilt and tested?

So you'd say, unlike Andrew, that I should not compile a new glibc. I need a new libstdc++, I hope this will be compatible with the old glibc. But if I really want to compile a new glibc, you think this is impossible/very difficult?

Thanks and regards,
Johannes
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