Date: Sat, 26 Jan 2013 18:54:21 +0000 From: David Chisnall <theraven@FreeBSD.org> To: Eitan Adler <lists@eitanadler.com> Cc: freebsd-standards@FreeBSD.org Subject: Re: standards/175453: Catching C std::bad_cast doesn' t work in FreeBSD 9.1 Message-ID: <9E117940-356E-4F15-9C9F-CDAEC99B5AE1@FreeBSD.org> In-Reply-To: <201301261710.r0QHA11J003897@freefall.freebsd.org> References: <201301261710.r0QHA11J003897@freefall.freebsd.org>
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This is more complicated than the test case I have. Simply calling =
__cxa_bad_cast() will trigger it. The issue is related to symbol =
versioning: libcxxrt and libsupc++ have the wrong symbol version for a =
number of C++ classes (mea culpa) and so when the runtime library throws =
the exception it throws its version, but everything else is seeing the =
other version.=20
David
On 26 Jan 2013, at 17:10, Eitan Adler wrote:
> The following reply was made to PR standards/175453; it has been noted =
by GNATS.
>=20
> From: Eitan Adler <lists@eitanadler.com>
> To: bug-followup@freebsd.org, hongli@phusion.nl
> Cc: =20
> Subject: Re: standards/175453: Catching C std::bad_cast doesn't =
work in
> FreeBSD 9.1
> Date: Sat, 26 Jan 2013 12:07:14 -0500
>=20
> This bug is probably well understood by now, but here is a minimal
> testcase for it (no includes, as few C++ features as possible):
>=20
> extern "C++" {
> namespace std {
> class exception {
> const char* name() const {
> }
> };
> class bad_cast : public exception {
> };
> }
> }
> class foo {
> public: virtual ~foo() {
> }
> };
> class bar: public foo {
> public: int val;
> bar(): val(123) {
> }
> };
> static void cast_test(const foo &f) {
> try {
> const bar &b =3D dynamic_cast<const bar &>(f);
> }
> catch (const std::bad_cast &) {
> }
> }
> int main() {
> foo f;
> cast_test(f);
> }
>=20
>=20
> --=20
> Eitan Adler
> _______________________________________________
> freebsd-standards@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-standards
> To unsubscribe, send any mail to =
"freebsd-standards-unsubscribe@freebsd.org"
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