Re: Lua 5.2 compiled with MINGW32 crashes my host program when a Lua error occurs

[KHMan <keinhong@...>]

On 11/12/2013 3:10 AM, Roberto Ierusalimschy wrote:
> > > I have definitely seen the problem on 32-bit Linux as well.  So I
> > > compile ldo.c specially in luabuild. Here is the relevant part of the
> > > lakefile:
> > >
> > > -- gcc 4.6 messes up setjmp/longjmp when optimizing
> > > local ldo = c.group{LDO,defines=defs,args=def,
> > >      flags=choose(CC=='gcc','-fno-omit-frame-pointer')
> > > }
> > >
> > > (point being that only this file needs the flag, and it may be GCC
> > > version specific)
> >
> > I've been sticking to Lua 5.1 on MinGW32...
>
> This seems to be a bug in the C compiler; apparently it has nothing to
> do with Lua itself. Lua 5.1 should present the same problem. (Actually
> the bug is not in the compiler itself, but in the implementation of
> longjmp/setjmp.)

I just missed out, my installed MinGW compilers went from gcc 
4.5.2 to gcc 4.7.1.

Patched I think by Kai Tietz [1]. Omitting the frame pointer 
caused a random value to be saved for %ebp by setjmp(). Didn't see 
any bug reports beyond gcc 4.6.x.

[1] http://gcc.gnu.org/ml/gcc/2011-10/msg00358.html

--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia