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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: Re: Julia on musl libc systems
Date: Sun, 31 Jan 2016 21:40:50 +0100
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* Rich Felker <dalias@libc.org> [2016-01-31 13:45:50 -0500]:
> On Sun, Jan 31, 2016 at 07:00:34PM +0100, Szabolcs Nagy wrote:
> > * Szabolcs Nagy <nsz@port70.net> [2016-01-31 17:49:56 +0100]:
> > > * Alba Pompeo <albapompeo@gmail.com> [2016-01-30 23:13:48 -0200]:
> > > > It's one of musl dependencies (suitesparse).
> > > > It's an off-putting issue, but I hope it's fixable. An internal compiler error.
> > > > https://github.com/tkelman/julia-alpine/issues/1#issuecomment-177282137
> > > > The .c file in question is here.
> > > > https://github.com/jluttine/suitesparse/blob/master/CHOLMOD/Modify/t_cholmod_updown_numkr.c
> > > > 
> > > 
> > > if an unstable version of the clang preprocessor crashes
> > > with ice, it is probably not libc related.
> > > 
> > 
> > sorry, i misunderstood the discussion
> > 
> > i see it is the alpine gcc that crashed on SuiteSparse
> > and i can reproduce it
> 
> Are they perhaps using C++ and precompiled headers? The latter are

no, a reduced test case is attached

gcc -O3 bug.c

fails, but

gcc -O3 -fno-tree-slp-vectorize bug.c

passes, so CFLAGS+=-fno-tree-slp-vectorize is a
workaround.

probably related to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68517
(although i dont see 0 sized structs here),
but i could not reproduce it with another toolchain,
only with the alpine x86_64 gcc-5.3.0 one.