Re: [Mingw-users] Dependency on libgcc_s_dw2-1.dll
- Date: Fri, 18 Sep 2015 08:08:46 -0400
- From: John Brown <johnbrown105@xxxxxxxxxxx>
- Subject: Re: [Mingw-users] Dependency on libgcc_s_dw2-1.dll
On Fri, 18 Sep 2015 09:53:37 +0300, Eli Zaretskii wrote:
> [Please don't take this to private mail.]
Sorry about that. Normally when I reply, Outlook.com sends the response
to the list, but its behaviour seems to have changed. Now I have to 'Reply
All' and delete your private address.
>> I don't understand. Why does gcc care who calls my C-language DLL?
> If the DLL you build will throw exceptions, not linking against shared
> libgcc will prevent those exceptions from being thrown and caught by
> other DLLs. GCC cannot know whether the applications or DLLs you are
> building expect that.
But I am not throwing exceptions, and if this behaviour is to prevent a
disaster that may or may not happen, why doesn't it do it all the time?
>> If my DLL (which neither catches nor throws C++ exceptions)
> (I don't think only C++ exceptions are affected. Windows supports
> exceptions in C code as well.)
It is true that when I build libThis and libThat I don't know whether they
implement Windows Structured Exception Handling or not unless I inspect
the source. I consider it unlikely though.
>> is called by a C++ module, then let *that* module link to
>> libgcc_s_dw2.dll if it catches or throws exceptions.
> You need both the throwing and the catching code to link against the
> shared libgcc.
> In any case, if you don't want the libgcc DLL dependency, and don't
> want to link against libgcc statically, what other options did you
> expect to exist?
I was hoping to avoid linking this (what I consider to be a) C++ DLL to my
C modules whether statically or dynamically, because I am not (explicitly)
calling any functions in it. Of course, if the default action were to link statically,
I wouldn't have known that it was happening and I would have continued in
Now that I know, I can follow your suggestion, but does it have any GPL
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