[Bug c++/63405] [4.9/5 regression] ICE in cp_perform_integral_promotions, at cp/typeck.c:2084

["gerrit.los at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63405

--- Comment #7 from Gert-jan Los <gerrit.los at gmail dot com> ---
2014-09-30 20:39:22 CEST schrieb trippels at gcc dot gnu.org:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63405
> 
> --- Comment #6 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
> Ah, the system compiler was build slightly before Jason's 
> r215172 checkin from 20140911.
> gcc version 4.9.2 20140911 (prerelease) (GCC)

The code triggering the ICE has been part of my code base since at least
3 months.  Within the project I used varying snaphots from trunk without
any problems.

I just retested with my system compiler [gcc version 4.9.1 (Debian 4.9.1-15)]
and now also get:
    internal compiler error: in cp_perform_integral_promotions, at
cp/typeck.c:2066

To provide context I attached:
    a) backtrace
    b) bisect log
    c) check script for creduce and bisect
    d) my reduced testcase

At every git-bisect step I did a full bootstrap
                $dir/$tgt/configure \
                        --prefix=$prefix \
                        --program-suffix=-snapshot \
                        --with-gmp=$prefix \
                        --with-mpfr=$prefix \
                        --with-mpc=$prefix \
                        --with-gnu-ld \
                        --enable-build-with-cxx --enable-cxx \
                        --enable-gold --enable-ld=default \
                        --enable-plugin --with-plugin-ld=ld.gold \
                        --enable-languages=c,c++ \
                        --enable-checking=release 
                make -j4 bootstrap
        make install

As you can see in bisect.log some checkouts did not trigger the internal
compiler error.

I now see one possible defect in my testing methodology: I'm grepping
for the line number of the error message.  Will retest with the fixed
check condition and report back tomorrow if the outcome changes.