Thread overview
Problems with -fPIC, libraries and exceptions (in linux?)
Jul 14, 2016
Arafel
Jul 15, 2016
Arafel
Jul 16, 2016
Seb
[OT] Re: Problems with -fPIC, libraries and exceptions (in linux?)
Jul 17, 2016
Basile B.
Jul 17, 2016
Basile B.
July 14, 2016
Hi!

I've stumbled across the following problem: when I raise an exception from a (statically linked) library that was compiled with -fPIC, I get a segmentation fault. Example:

-- libfoo/dub.json
{
	"name" : "foo",
	"description" : "Exception raising lib",
	"dflags" : [ "-fPIC" ]
}
--
-- libfoo/source/foo.d
module foo;

public void throwIt() {
	throw new Exception("This is an exception!");
}
--
-- bar/dub.json
{
	"name" : "bar",
	"description" : "uses libfoo",
	"dependencies" : { "foo" : "*" },
}
-- bar/source/app.d
import foo;

void main() {
	throwIt();
}
--

If I run "bar" (after libfoo is added through "dub add-local", of course), I get a segmentation fault (the exception cannot even be caught). If I remove "-fPIC" I get the usual stack trace and I can catch the exception as well.

Is this a compiler bug or is there a reason for that? I'm using "DMD64 D Compiler v2.071.1", I haven't tried yet with ldc or gdc.

P.S.: This is simplified test case, the reason why I'm trying -fPIC is because I want to link a dependency statically in a .so file which in turn will be dynamically loaded as a plugin.
July 15, 2016
Just as a follow-up, I think it's looking more and more like a compiler bug. It works properly both with gdc and ldmd2. Should I make a bug report about that?
July 16, 2016
On Friday, 15 July 2016 at 08:40:02 UTC, Arafel wrote:
> Just as a follow-up, I think it's looking more and more like a compiler bug. It works properly both with gdc and ldmd2. Should I make a bug report about that?

Yes please.
July 17, 2016
On Saturday, 16 July 2016 at 20:13:00 UTC, Seb wrote:
> On Friday, 15 July 2016 at 08:40:02 UTC, Arafel wrote:
>> Just as a follow-up, I think it's looking more and more like a compiler bug. It works properly both with gdc and ldmd2. Should I make a bug report about that?
>
> Yes please.

Hi, you wanted to talk ?
I'm on D IRC channel today, whole day, european time.
July 17, 2016
On Sunday, 17 July 2016 at 05:07:00 UTC, Basile B. wrote:
> On Saturday, 16 July 2016 at 20:13:00 UTC, Seb wrote:
>> On Friday, 15 July 2016 at 08:40:02 UTC, Arafel wrote:
>>> Just as a follow-up, I think it's looking more and more like a compiler bug. It works properly both with gdc and ldmd2. Should I make a bug report about that?
>>
>> Yes please.
>
> Hi, you wanted to talk ?
> I'm on D IRC channel today, whole day, european time.

BBaz.