Date: Fri, 4 Jan 2013 16:49:41 +0100 From: Stefan Farfeleder <stefanf@FreeBSD.org> To: Dimitry Andric <dim@FreeBSD.org> Cc: freebsd-current@freebsd.org, Nathan Whitehorn <nwhitehorn@freebsd.org> Subject: Re: clang 3.2 RC2 miscompiles libgcc? Message-ID: <20130104154940.GD1430@mole.fafoe.narf.at> In-Reply-To: <20130102135950.GA1464@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>
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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:
> >
> > 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...
> >
> > Do you happen to have a smaller testcase, by any chance?
>
> Not yet, but I'll try to come up with something smaller.
Here's a minimal test case that reproduces the bug:
$ cat throw-crash.cc
#include <stdexcept>
void f2(void) {
std::string s;
throw std::runtime_error("foo");
}
void f1(void) {
f2();
}
int main(void) {
try {
std::string s1, s2;
f1();
return 0;
} catch (const std::exception &) {
return 1;
}
}
$ g++ -O2 -finline-limit=0 throw-crash.cc
$ ./a.out
zsh: bus error (core dumped) ./a.out
Stefan
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