You might run into a problem using only the static libwinpthread on some
packages, i speak from experience since
im using a method similar to the suggested one. The problem is that some
shared libraries linked to the static libwinpthread.a library will throw
a multiple definition error if the winpthread functions are allready
referenced in those libraries. To get around that use
-Wl,--exclude-libs,libpthread.a in LDFLAGS and things should work again.
You could also use -Wl,--allow-multiple-definition but its not
recomended since i seen examples of it breaking other stuff.
Den 21-01-2017 kl. 03:58 skrev lhmouse:
> On 2017/1/21 6:01, Computer Jock wrote:
>> I hope I know what I'm talking about here...
>>
>> Sometimes (probably with g++) when attempting to create a 64-bit DLL
>> with only windows dependencies one gets a reference to:
>>
>> libwinpthread-1.dll => /mingw64/bin/libwinpthread-1.dll
>>
>> Googling for solutions finds quite a few people having the same problem.
>>
>> Many suggest using:
>>
>>g++ -shared ...
>>-static-libgcc -static-libstdc++
>> -Wl,-Bstatic
>> -lstdc++
>> -lpthread
>> -Wl,-Bdynamic
>>
>> That works for some links but not for others.
>>
>> I ran across this debian bug report from 2014:
>>
>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=748353
>>
>> It suggests that it would be possible to avoid the reference to
>> libwinpthread-1.dll in favor of the default windows threading library.
> >
> That is not possible as long as you are using a GCC with the `posix`
> thread model. You have to build one yourself since MSYS2 does not
> provide such a toolchain AFAIK.
>
>> Two related questions:
>>
>> 1) Is there a way to ensure statically linking -lpthread and avoid the
>> reference to libwinpthread-1.dll ?
> Yes. Just delete the file `libwinpthread.dll.a`.
>
> One more word: `-lpthread` is basically *wrong*. To compile and link
> with pthread, use `-pthread` (no `l` there).
>
>> 2) Would the fix (I assume they fixed it for debian) work for the msys2
>> 64-bit gcc?
> Yes. GCC prefers dynamic libraries unless `-static` is given. When a
> dynamic library isn't available it looks for the corresponding static
> library instead. You do have `libwinpthread.a`, no?
>
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