Re: Breakage on builder RHEL-s390x-m64, revision 7a6dbc2fdb2323c35e981f93236f323e9d7c0b24

[Tom Tromey <tom at tromey dot com>]

>>>>> "Sergio" == Sergio Durigan Junior <sergiodj@redhat.com> writes:

Sergio> After my last commit, which updated GDB's local copy of gnulib, I'm
Sergio> seeing a breakage on the RHEL 7.1 s390x builder (see the rest of the
Sergio> quoted message).  Unfortunately I don't have easy access to a similar
Sergio> machine, so I would like to know if:

Something fishy is going on that builder.  I did a try run of my ubsan
series and got many errors like this:

(gdb) break check_vx
/usr/include/c++/4.8.2/debug/vector:
Error: attempt to subscript container with out-of-bounds index gdb: /home/dje/src/gcc-6-branch/libstdc++-v3/src/c++11/debug.cc:942: void {anonymous}::print_string({anonymous}::PrintContext&, const char*, const _Parameter*, std::size_t): Assertion `param_index < num_parameters' failed.

However I think this should only happen if libstdc++ debug mode is
enabled.  (Is this correct?  Maybe this is the error.)

I did do some try runs in the past of libstdc++ debug mode.  So, I am
wondering if there could somehow be stale .o files around.  I don't see
how really -- I'd expect configure to make config.h, and for that to
force a full rebuild.  But it still looks suspicious.

Tom