J Elaych on Thu, 06 Aug 2009 22:23:25 +0200

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Ubuntu 9.10 and gcc-4.4 failure

Hi all,

I've been working with the Sage / Python package which
includes pari-2.3.4 and noticed that the build failed at
the command

/usr/bin/gcc  -c -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer    -I. -I../src/headers -fPIC -o base3.o ../src/basemath/base3.c

when using the latest gcc-4.4.  When I switched back to
gcc-4.3 pari built fine.   Unfortunately because of the way
the Sage/Python packages are released, we need to be
able to use the latest gcc's.  I'm using the Ubuntu prerelease
of 9.10.

I have found that the problem is completely reproducible
from the pari-2.3.4.tar.gz and pari-2.4.2.alpha.tar.gz
tarballs.  With 'make -j2 all' the compile extends to
init.c, where presumably the second thread halts.  Using
'top' shows cc1 taking up 99% cpu and most of the
memory, for hours until its interrupted.

I didn't find any gcc-4.4 related issues when I searched the
mailing list archives, so I want to bring this issue to your
attention if you don't already know about the problem.