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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/64922] [5 Regression] runtime error: member call on misaligned address for type 'struct _Rep'
Date: Wed, 04 Feb 2015 20:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64922

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #8)
> So, with the patch you've posted I get:
> $ /usr/src/gcc/obj/gcc/g++ -B /usr/src/gcc/obj/gcc/
> `/usr/src/gcc/obj/x86_*/libstdc++-v3/scripts/testsuite_flags
> --build-includes` -E -o x.ii x.cc -O2 -D_GLIBCXX_USE_CXX11_ABI=0
> $ /usr/src/gcc/obj/gcc/cc1plus -fsanitize=alignment,bool,enum,unreachable
> -O2 x.ii  -quiet
> $ gcc -o x x.s
> /usr/src/gcc/obj/x86_64-unknown-linux-gnu/libsanitizer/ubsan/.libs/libubsan.
> a -lpthread -ldl
> /usr/src/gcc/obj/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.
> so
> -Wl,-rpath,/usr/src/gcc/obj/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/
> $ ./pol6 a
> x.cc:39:3: runtime error: execution reached a __builtin_unreachable() call
> 
> And the unreachable calls in there are IMHO wrong.

/g++ -> /xg++
./pol6 -> ./x

Sorry, for the typos.