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	Wed, 25 May 2022 09:54:23 -0700 (PDT)
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Date:	Wed, 25 May 2022 18:54:22 +0200
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Subject:	Re: GNU pth during djgpp build time?
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On 2022-05-02 05:49, janezz55 (janezz55 AT gmail DOT com) [via djgpp AT delorie DOT com] wrote:
> I know a port exists, but for all I know it's an add-on to an already existing djgpp install, so no <thread> header becomes available after installing it. But if pth could be built during build-time of djgpp, <thread> would become available. Does any build script (for linux) feature this? I tried to do the hack myself, but it took too much time. Maybe there's an alternative to GNU pth to get <thread>?

Hi again,

I have some progress to report: it doesn't work :)

Surprisingly, configuring gcc with --enable-threads is actually possible, but
it did require a small patch to Pth.  The executables it produces however, will
not run.  A thread-aware libgcc will try to lock a mutex in
__register_frame_info(), which is invoked from crt0 before __crt1_startup().
But locking a mutex involves a whole series of libc functions that rely on
things like _dos_ds, which are only initialized from __crt1_startup().

Fixing this would involve reordering the crt0 startup logic.  Or maybe libgcc
could be patched to not use a mutex at that point.  If you (or anyone else)
want to experiment with that, you can use the following build scripts:

    https://github.com/jwt27/build-gcc/tree/pth

Checkout branch 'pth', then first build a regular toolchain:

    $ ./build-djgpp.sh --prefix=$HOME/djgpp djgpp-cvs binutils gcc

Then use that toolchain to compile Pth and build a second toolchain configured
with --enable-threads=posix (this is done automatically in one step):

    $ PATH="$HOME/djgpp/bin:$PATH" \
      ./build-djgpp.sh --prefix=$HOME/djgpp-pth djgpp-cvs binutils gcc watt32 pth

Linking requires -lstdc++ -lpthread -lsocket, in that order.

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