Re: aix cross(?)compiler

["Jędrzej Dudkiewicz" <jedrzej.dudkiewicz@gmail.com>]

On Wed, Dec 14, 2011 at 12:15 PM, Kai Ruottu <kai.ruottu@wippies.com> wrote:
 > 14.12.2011 10:36, Jędrzej Dudkiewicz kirjoitti:
 >>
 >> Hi,
 >>
 >> I'm building gcc 4.6.2 (C and C++) on AIX 5.2 to compile for AIX
 >> 4.3.3. I copied libraries and /usr/ccs/bin (as, nm, ld and others)
 >> from 4.3.3 to sysroot/ directory on AIX 5.2.
 >>
 >> AS_FOR_TARGET=/home/jd/xcomp/sysroot/usr/ccs/bin/as \
 >> LD_FOR_TARGET=/home/jd/xcomp/sysroot/usr/ccs/bin/ld \
 >> STRIP_FOR_TARGET=/home/jd/xcomp/sysroot/usr/ccs/bin/strip \
 >> RANLIB_FOR_TARGET=/home/jd/xcomp/sysroot/usr/ccs/bin/ranlib \
 >> AR_FOR_TARGET=/home/jd/xcomp/sysroot/usr/ccs/bin/ar \
 >> NM_FOR_TARGET=/home/jd/xcomp/sysroot/usr/ccs/bin/nm \
 >
 >
 > This makes the build to differ from the normal cross GCC case
 > where GNU binutils are used as the target binutils. Here the
 > native AIX 4.3.3 binutils are used on a AIX 5.2 cross host
 > as the target binutils. So my stupid question is whether this
 > choice should work at all?

Well, it must :), otherwise building it is quite probably impossible,
 as it seems that GNU binutils do not fully support AIX - but I can't
 say for sure, as I were unable to find a definite list of supported
 systems. I tried building using GNU binutils, but 'as' refused to
 compile source code, claiming that it does not know about instruction
 fmul, if my memory serves well.

 >>          --with-as=/home/jd/xcomp/sysroot/usr/ccs/bin/as \
 >>          --with-ld=/home/jd//xcomp/sysroot/usr/ccs/bin/ld \
 >
 >
 > These AIX 4.3.3 'as' and 'ld' seemingly don't crash on AIX 5.2
 > but :

Well, RedHat 7.3 binaries do not crash on Fedora 16 for a reason :)

 >> /home/jd/xcomp/build/./gcc/xgcc -B/home/jd/xcomp/build/./gcc/
 >> -B/opt/xgcc/gcc-4.6.2/powerpc-ibm-aix4.3.3.0/bin/
 >> -B/opt/xgcc/gcc-4.6.2/powerpc-ibm-aix4.3.3.0/lib/ -isystem
 >> /opt/xgcc/gcc-4.6.2/powerpc-ibm-aix4.3.3.0/include -isystem
 >> /opt/xgcc/gcc-4.6.2/powerpc-ibm-aix4.3.3.0/sys-include
 >> --sysroot=/home/jd/xcomp/sysroot
 >
 >
 > what about the native AIX 4.3.3 'ld' understanding where the
 > target library stuff is?  What the libgcc configure understood
 > about the target libraries?

I have no idea how to check it or what should I do to make it
 understand it - any hints or pointers to required literature? My
 understanding was that "--sysroot" forces gcc to provide 'ld' with
 required information.

 > If behaving normally, building GNU binutils for the AIX 5.2
 > $host and targeting to the AIX 4.3.3 $target and configuring
 > them using '--with-sysroot=' to search from $sysroot for the
 > AIX 4.3.3, there wouldn't be these suspicicions and stupid
 > questions... And any crash in the build would be a clear bug
 > but it is hard to say what this case really is.

If there is a list of systems supported by GNU binutils, I will
 happily consult it and if my system is listed as supported, I'll
 report errors as soon as I reproduce them.


--
 Jędrzej Dudkiewicz

 I really hate this damn machine, I wish that they would sell it.
 It never does just what I want, but only what I tell it.