Cross-compiling gcc? (sysroot confusion)

[Christer Solskogen]

On 01.11.2014 00:18, Pierre Ossman wrote:
>> You are doing several things wrong.
>>
>> First off - Keep the cross compiler and cross binutils *out* of /sysroot. Install them somewhere else. That includes gmp, mpfr and mpc. The easiest way (imho) is to create /cross where you install all of those. I would also recommend to install gmp,mpfr and mpc with static only. *Or* if you have root access, just use the ones that come with your distribution.
>>
>
> But I was keeping them out of /sysroot. I was putting the tools
> in /bootstrap. So I'm not sure what you're suggesting here?
>

I probably missed that part :-)

> So I can build all of glibc with the --without-headers gcc?
>

Yeap.


> Of course. I left those out as they are fairly straight forward
> applications to cross compile. It's gcc that's the cause of concern as
> it looks in more detail at the build system. But what about the
> specifics of building gcc? What configure flags to I need to specify?
> That's my primary source of confusion.
>

A lot of stuff is *not* straight forward to cross compile. Coreutils 
,for instance, can be a pain.
Whats the confusion? The final-gcc is pretty straight forward :-)

I would use something like this:
  export PATH=/bootstrap/bin:$PATH
    ./configure --target=i686-pc-linux-gnu --prefix=/bootstrap
                --with-gmp=/bootstrap --with-mpfr=... --with-mpc=...
                --with-sysroot=/sysroot
                --enable-__cxa_atexit
                --enable-languages=c,c++

(I'm not 100% sure, but I don't think you need to specify to disable 
multilib on i686)

-- 
chs