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

[Joshua Branson]

zamfofex <zamfofex@twdb.moe> writes:

> Hello, Guix! I have been trying to update the Hurd packages to their latest
> commits in the hopes that I can eventually get networking with netdde
> functioning.
>
> In <https://issues.guix.gnu.org/51770>, I got something that seemed to be
> working at first (at least it progressed farther than the status quo at the
> time), but eventually I got an error that seemed related to Mig, which I had 
> not
> updated in that patch set.
>
> Updating Mig required a more recent glibc than what was available in Guix at 
> the time, so I worked on <https://issues.guix.gnu.org/54832> to update glibc.
>
> Now that the recent glibc is on core-updates, I picked up my work once again. 
> I
> updated the packages to the latest commits, and updated Mig! However, I ran 
> into
> an issue while trying to build a system image. The issue is that GMP fails to
> cross‐compile during the ‘configure’ phase becase the cross‐compiling ‘g++’ is
> not functional.
>
> When checking whether ‘g++’ can compile executables during ‘configure’, ‘g++’ 
> is
> unable to link the executables because some ‘pthread_*’ symbols required by
> libstdc++ are missing from libc. And when checking using ‘readelf’, they are
> indeed missing from the cross‐built libc, which instead contains similar
> ‘__pthread_*’ symbols.
>
> I don’t know for sure what the issue is, but I highly suspect libstdc++ is 
> being
> compiled against the native glibc headers, rather than the cross‐built glibc
> headers like it should.
>

I am way out of my depth here, but would it matter that on the hurd
pthread is not in glibc?

https://lists.gnu.org/archive/html/bug-hurd/2022-10/msg00069.html

>
> Note: Currently, trying to cross‐build packages from core‐updates for the Hurd
> will fail while compiling glibc, since the Hurd package is too outdated for 
> that
> version of glibc.
>
> I’ll attach a diff (for core-updates) with the updated Hurd packages to this 
> email. To verify the behavior I’m describing, try running:
>
> - - - - -
> ./pre-inst-env guix build --target=i586-pc-gnu gmp
> - - - - -
>
> Any kind of assistance would be appreciated! Thanks in advance.