Re: std::string across DLL boundaries

["Gerrit P. Haase" <freeweb at nyckelpiga dot de>]

Ilia wrote:

> Hi,

> I've run into a problem passing a string ref to a dll:

> testdll.C: (I've tried adding __declspec(dllimport/export) too)

> void f(std::string& a) { a = "asdf"; }

> test.C:

> int main(void) { std::string a; f(a); std::cout << a << std::endl; }

> If I compile it with static linking, the program works as expected. If f
> is in a dll, then I can't get it to work -- different setups either go
> into an infinite loop at a = "asdf", or dump core.

> If, on the other hand, I do std::string a = "qwer", then it will work
> fine -- it seems as though there may be a problem with the allocator in
> libg++, though I may just be supplying the wrong flags to gcc.

> Could someone either confirm that this is a problem, or, preferably,
> provide instructions for getting this to compile "correctly"? (And if
> this is a problem, are there known workarounds, is there a PR open
> somewhere, etc)

Yes, there was already some related discussion and I opened a PR:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24196


> Thanks,

> Ilia

> P.S. This works fine with MinGW, so it's not some huge windows dll
> limitation.

Gerrit
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