* Szabolcs Nagy <nsz@port70.net> [2016-01-31 21:40:50 +0100]:
> * Rich Felker <dalias@libc.org> [2016-01-31 13:45:50 -0500]:
> > Are they perhaps using C++ and precompiled headers? The latter are
> 
> no, a reduced test case is attached

now really

> 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.