x86-64 with lib and lib64

[Dan Kegel]

Roman Duka wrote:
> Dan Kegel wrote:
> 
>> Roman Duka wrote:
>>
>>> a silly question, for x86-64 targets we get 2 lib dirs, lib and 
>>> lib64, does that mean that the SAME toolchain could produce 64 bit 
>>> and 32 bit binaries?? and if yes how, by using compiler switches or 
>>> something else?
>>
>> Yes, with a compiler switch, though I haven't tried it myself.
>> Note however that you need to compile the C library once for
>> each architecture.
> 
> i'm trying to do it now, i think we need to pass --enable-multilib when 
> configuring cross gcc for x86-64, however it fails with error on 
> gcc-3.3.2, it says something about ld skipping incompatible libraries 
> when linking with -lc etc ??? i've managed to built full x86-64 
> toolchain, but only with --disable-multilib options. well i'll try a 
> snapshot of gcc-3.4.0, maybe that's different.

for x86_64, I highly recommend gcc-3.3.3 snapshots rather than gcc-3.3.2,
since I had no success until I turned on --with-sysroot, which is new to
gcc-3.3.3 and gcc-3.4.

I don't use --disable-multilib when building my final gcc with gcc-3.3.3, by
the way, so maybe I already have both versions of the startup files; I
haven't checked.
- Dan



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