I've done some more investigation and actually, generally speaking C++
exceptions do seem to work on PPC but for some reason not always. I experienced
some rather strange behaviour, e.g.
// this throw() worked correctly
throw(0);
if (_config->isInited) return {};
// this throw() didn't work and caused a program freeze
if (_config->isInited) return {};
throw(0);
The next thing I tried was turning the optimizer off (previously I was always
compiling with -O2). Interestingly, turning the optimizer off solved the
problem. When compiling without -O2 exceptions seem to work fine and there is
no strange behaviour any longer but even using the lowest level of
optimization, i.e. just -O, will bring the problems back.
So the good news is that I've found a workaround. Turning the optimizer off
will make exceptions work again but the bad news is that of course it looks
like there is some major issue in the optimizer because enabling it seems to
break exceptions...
FWIW, I've also tried gcc-mp-7 (MacPorts gcc7 7.5.0_4) which AFAICS is the most
recent gcc available for PPC but it shows the same behaviour.
On 27.05.2024 at 18:46 Ken Cunningham wrote:
> do exceptions work with the default gcc7 compiler?
