On Friday, 19 September 2014 at 06:35:32 UTC, Iain Buclaw via
Digitalmars-d wrote:
On 19 Sep 2014 05:50, "Koz Ross via Digitalmars-d" <
[email protected]> wrote:
I don't know if this is the right place to ask, but I figured
it was
worth a try. Basically, I'm getting totally bizarre behaviour
from my code,
which I have put in a repo at
https://gitorious.org/tournament-tree/tournament-tree/source/545460fb9d760b6bfa5bc74deb7b69d79ec70541
:
To replicate the error, simply run 'make profile' from the
project
directory. It should fail (claiming an enforcement error on
node.d, line
50). Then, go to tournament.d, and uncomment line 33. Then, try
'make
profile' again, and it won't have the same issue. I've been
working all day
to try and isolate the source of the problem, across multiple
machines, and
I've had no luck. This is the most isolation I've managed.
I would really appreciate any and all help, as this is
something that
totally baffles me. I know this is a lot of code, and it's
probably quite
hideous, but it would help me a lot if someone could at least
suggest as to
where the source of the problem lies.
I already am aware that the failure is caused by an overflow,
but its
source is completely unclear, and I never get overflows when
that one
writeln statement in tournament.d is executed (hence my
confusion).
I'm running Manjaro GNU/Linux, and my gdc version is 4.9.1. I
have a
64-bit OS.
What flags are you using to build? And is this a package you
installed
from your distribution?
Recently in upstream, I've turned on -fwrapv by default so that
the backend
handles overflow as precisely defined, rather than optimising
aggressively
by pretending it never happens.
http://bugzilla.gdcproject.org/show_bug.cgi?id=141
It may be a good idea to add this flag to your build script if
you are
using an earlier version of gdc.
Iain.
Hi Iain,
I'm using the flags as described in the makefile - my compile
command is always
gdc -O3 -funittest -Wall -Werror -Wdeprecated -Wunknown-pragmas -g
The package I'm using is the gdc package from AUR (as Manjaro is
an Arch).
I'll try -fwrapv and see if it does anything.
