Date: Fri, 4 Jan 2013 20:14:38 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Stefan Farfeleder <stefanf@freebsd.org> Cc: freebsd-current@freebsd.org, Dimitry Andric <dim@freebsd.org>, Nathan Whitehorn <nwhitehorn@freebsd.org> Subject: Re: clang 3.2 RC2 miscompiles libgcc? Message-ID: <20130104181438.GL82219@kib.kiev.ua> In-Reply-To: <20130104154940.GD1430@mole.fafoe.narf.at> References: <20121227150724.GA1431@mole.fafoe.narf.at> <50DC65F5.6060004@freebsd.org> <50E0BD66.4070609@FreeBSD.org> <20130102135950.GA1464@mole.fafoe.narf.at> <20130104154940.GD1430@mole.fafoe.narf.at>
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On Fri, Jan 04, 2013 at 04:49:41PM +0100, Stefan Farfeleder wrote:
> On Wed, Jan 02, 2013 at 02:59:50PM +0100, Stefan Farfeleder wrote:
> > On Sun, Dec 30, 2012 at 11:17:10PM +0100, Dimitry Andric wrote:
> > >=20
> > > I have been playing with Stefan's testcase for a while now, and while=
I
> > > can reproduce the crashes, I am still at a loss about the cause. It
> > > does seem to have something to do with throwing exceptions, but I am
> > > still not sure whether I am looking at a bug in boost, gcc, clang, or
> > > libgcc...
> > >=20
> > > Do you happen to have a smaller testcase, by any chance?
> >=20
> > Not yet, but I'll try to come up with something smaller.
>=20
> Here's a minimal test case that reproduces the bug:
>=20
> $ cat throw-crash.cc
> #include <stdexcept>
>=20
> void f2(void) {
> std::string s;
> throw std::runtime_error("foo");
> }
>=20
> void f1(void) {
> f2();
> }
>=20
> int main(void) {
> try {
> std::string s1, s2;
> f1();
> return 0;
> } catch (const std::exception &) {
> return 1;
> }
> }
> $ g++ -O2 -finline-limit=3D0 throw-crash.cc=20
> $ ./a.out=20
> zsh: bus error (core dumped) ./a.out
What is the backtrace ?
Compile the system libraries (ld-elf, libc, libgcc etc) with the
debugging information and obtain the backtrace once more.
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