Segfault generated by gcc-7

Markus Trippelsdorf markus@trippelsdorf.de
Tue Aug 29 10:42:00 GMT 2017


On 2017.08.29 at 12:35 +0200, Markus Trippelsdorf wrote:
> On 2017.08.29 at 12:31 +0200, Marco Varlese wrote:
> > Hi,
> > 
> > I got a SEGFAULT in my program when compiling it with gcc-7 but it
> > is/was all good when using gcc-6.
> > 
> > The SEGFAULT happens due to the line below:
> > d_point = *p;
> > 
> > And a fix for it (with gcc-7) has been:
> > memcpy(&d_point, 
> > 	p, 
> > 	sizeof(d_point));
> > 
> > Does this make any sense to anybody?
> 
> No. Please open a bug and attach the full program that causes the crash.
> Otherwise the issue is impossible to debug.

But my guess would be a misaligned address. Try building with
-fsanitize=undefined and fix all issues the sanitizer points out.

-- 
Markus



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