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From: Rich Felker <dalias@libc.org>
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Subject: Re: Problems with pthreads from a shared object?
Date: Wed, 7 Nov 2018 20:28:39 -0500
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On Wed, Nov 07, 2018 at 08:02:01PM -0500, Barry Flartus wrote:
> On Wed, Nov 7, 2018 at 7:43 PM Rich Felker <dalias@libc.org> wrote:
> 
> > On Wed, Nov 07, 2018 at 06:53:33PM -0500, Barry Flartus wrote:
> > > >
> > > > OK. Can you run strace -f ./launch (or whatever the launch program
> > > > executable is called) and post the output?
> > > >
> > > > Rich
> > > >
> >
> >
> The "launching" program was compiled with gcc:
> gcc launch.c -ldl -o launch

You can't use shared libraries built for musl with glibc, so it's
expected that this doesn't work.

> When I attempt to compile the "launching" program with musl-gcc I get the
> following output:
> vagrant@ubuntu-x64:~$ /usr/local/musl/x86_64/bin/musl-gcc launch.c -ldl -o
> launch
> vagrant@ubuntu-x64:~$ ./launch
> 
> Launching test...
> Dynamic loading not supported

Apparently it's static-linked. Did you omit shared libraries when
building musl?

> The shared object was compiled with musl-gcc:
> /usr/local/musl/x86_64/bin/musl-gcc -Wall -lpthread -shared -fPIC test.c -o
> test.so

If so (if there's no libc.so, only libc.a, present) then this command
will also be producing a broken .so file. You can't make shared
libraries without a shared libc existing.

Rich