Mark Dickinson <dicki...@gmail.com> added the comment:

Reverted the temporary debugging commits in r82755, so test_float is now 
crashing again on that buildbot.

I've made yet another temporary commit (r82756) to get the configure script to 
tell me what gcc version is being used on that machine.  Once I've got that 
info, I can have a go at reproducing this locally.  If that fails, I'll create 
a branch and try to debug the buildbot remotely via repeated test runs on that 
branch.

... and the results from the configure script are in: it's an experimental 
prerelease version of gcc!  This makes me even more suspicious that it's a 
compiler bug.

checking gcc version... Using built-in specs.
COLLECT_GCC=/usr/lib/gcc-snapshot/bin/gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc-snapshot/libexec/gcc/i686-linux-gnu/4.6.0/lto-wrapper
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 
20100702-0ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-snapshot/README.Bugs 
--enable-languages=c,ada,c++,java,fortran,objc,obj-c++ 
--prefix=/usr/lib/gcc-snapshot --enable-shared --enable-multiarch 
--enable-linker-build-id --with-system-zlib --disable-nls --with-sysroot=/ 
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes 
--enable-plugin --enable-gold --with-plugin-ld=ld.gold --disable-browser-plugin 
--enable-java-awt=gtk --enable-gtk-cairo 
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.6-snap/jre --enable-java-home 
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.6-snap 
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.6-snap 
--with-arch-directory=i386 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar 
--enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686 
--with-tune=generic --enable-checking=yes --build=i686-linux-gnu 
--host=i686-linux-gnu --target=i686-linux-gn
 u
Thread model: posix
gcc version 4.6.0 20100702 (experimental) [trunk revision 161740] (Ubuntu 
20100702-0ubuntu1)

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