Re: Linking issue when using MinGW with Posix Threads

[Nikos Mavrogiannopoulos <nmav@xxxxxxxxxx>]

On Thu, Jan 16, 2020 at 4:29 PM Andreas Schneider <asn@xxxxxxxxxxxxxx> wrote:
>
> On Thursday, 16 January 2020 14:40:50 CET g4-lisz@xxxxxxxxxxxx wrote:
> > Hi there,
> >
> > cmake detects pthreads and compiling goes well. But on linking, there
> > are unresolved references:
> >
> > CMakeFiles/ssh.dir/objects.a(pthread.c.obj):pthread.c:(.text+0x43):
> > undefined reference to `pthread_mutex_destroy'
> >
> > ... and so on.
> >
> > This can be solved by adding `-lpthread `at the end of the last line of
> > build/src/CMakeFiles/ssh.dir/link.txt
> >
> > I don't know a lot about cmake. So I couldn't find a way to tell it to
> > add it at the rigth place.
> >
> > CMAKE_SHARED_LINKER_FLAGS etc. did not do the trick because it puts it
> > in the wrong place (before CMakeFiles/ssh.dir/objects.a).
>
> Can you try:
>
> https://git.libssh.org/users/asn/libssh.git/commit/?h=master-threads

On glibc you may not want to link with -lpthread, unless you are using
real threads. That's because it can increase the overhead for single
threaded applications.
See also: https://bugzilla.redhat.com/show_bug.cgi?id=877421

regards,
Nikos