Red Hat Bugzilla – Bug 18983
Gcc crashes when compiling glibc
Last modified: 2007-04-18 12:29:18 EDT
When rebuilding the glibc RPM with --target=i686 gcc 2.96 core dumps
(illegal instruction) during the compilation of the sun_rpc directory. It
is very reproducible and it happens both with the original and the patched
glibc you issued a few days ago.
The distribution is vanilla RedHat 7 where everything has been installed,
glibc was the original one. The RPM builds successfully when targetting
My box has a K6/2 processor
Details please, which file does it crash on, which options passed to it,
preprocessed file (best run rpm -ba glibc.spec 2>&1 | tee glibc.log,
then cut'n'paste the command which caused the gcc to crash, add
-save-temps -v to it and send me its output and the .i file).
I cannot reproduce this myself and I'm building glibc with these
flags (both i386 and i686 targets) almost daily for a couple of
Actually, why are you building i686 glibc on K6/2? K6/2 AFAIK does not have
conditional move instructions, so if the SIGILL comes when glibc tries to
run rpcgen or similar program, it can crash on K6/2 if there are any
cmoves generated (which gcc can legally use if -march=i686).
During glibc bootstrap after the main library is compiled glibc executes
binaries using the newly built dynamic linker and library.
It turned to be a mistake. Somewhere in the the building of glibc an auxilary
program is byuilt and executed. Since that executable was generated with the
PPro instruction set and I was on a K6/2 it core
dumped and I thought it was the compiler who had core dumped.