On 2011-07-25 13:29, Michel Fortin wrote:
On 2011-07-25 05:07:32 +0000, Sean Kelly <[email protected]> said:
I ran into this issue but didn't have time to track it down at the time.
I'd guess that it's the same old object file generation issue that
arises with every OSX release (where the way DMD marks data blocks for
exception handling, TLS, etc, breaks for one reason or another), and
that ASLR is simply the latest cause. I couldn't suggest a fix
though... I don't know how ASLR works well enough.
The way all those blocks are identified by the runtime is a hack. It
works, but it's too fragile. What needs to be done is to use the proper
API for getting data segments -- namely "getsectdatafromheader" or
"getsectdatafromheader_64", or some equivalent -- instead of depending
on some dummy segments always being ordered in a specific way by the
linker and the loader.
There was a discussion about that on the phobos mailing list back in
november 2010 (see "Showstopper bug: Hello world fails on OSX!").
I created a patch back then but it was never applied. The patch removed
those "hacks" and uses "getsectdatafromheader" instead, but it never
fixed the "Hello world fails on OSX!" issue completely.
http://d.puremagic.com/issues/show_bug.cgi?id=4854
--
/Jacob Carlborg
