Re: GMP GCC C++ Hurd cross-build failure on core-updates

[Svante Signell <svante.signell@gmail.com>]

On Thu, 2022-12-15 at 01:24 -0600, Nathan Dehnel wrote:
> You could try seeing what they're doing here to cross-build
> https://github.com/flavioc/cross-hurd
> It worked last time I ran it (which was admittedly a while ago)

Hi,

The problem is probably that you need to add --enable-add-ons=libpthread to
configure when building first version of cross-glibc. This is to obtain weak
references when building libcstd++ of cross-gcc:

nm --dynamic /cross-tools/lib/libstdc++.so.6.0.30|grep pthread
...
w __pthread_key_create
w pthread_key_create
w pthread_key_delete
...

Then that build of cross-gcc will succeed in building the Hurd version of
libstdc++ etc.
nm --dynamic /tools/lib/libstdc++.so.6.0.30|grep pthread
<same as above>

The problem is due to that with recent versions of glibc libpthread is included
for Linux, but not for Hurd.

Note that don't issue autoreconf gcc (in my case 12.2.0) unless you have only
autoconf2.69 installed (or what is needed for your version of upstream gcc).

My scripts to cross-build Hurd on Debian/GNU Linux: hurd-cross (hurdX) will soon
be published on Savannah under the Hurd umbrella. Note the name difference:
hurd-cross vs cross-hurd. As of current these scripts include up-to-date
versions of all packages used, with git versions of mig, gnumach and hurd.

(The scripts of hurd-cross were based on the work by Flavio in 2019, thank you
Flavio. However they have diverged considerably since then, and are not easily
merged into his work at github)

Good luck!