Problem with cross-toolchain support for Hurd

[Manolis Ragkousis]

Hello everyone,

On current master I tried running `./pre-inst-env guix build -e '((@@
(gnu packages cross-base) cross-kernel-headers) "i586-pc-gnu")'` and it
fails with

checking for __builtin_trap with no external dependencies... yes
checking whether the C++ compiler supports thread_local... no
running configure fragment for sysdeps/mach/hurd
checking Hurd header version... bad
configure: error: Hurd headers not installed or too old
Backtrace:
           4 (primitive-load "/gnu/store/mydjjawi1vspl5p5i547ny2fz5x?")
In ice-9/eval.scm:
   191:35  3 (_ _)
In srfi/srfi-1.scm:
    640:9  2 (for-each #<procedure a45b00 at /gnu/store/f95ghy8mx00?> ?)
In
/gnu/store/f95ghy8mx00fc22nrvswvnpqlfdkf2nk-module-import/guix/build/gnu-build-system.scm:
   799:31  1 (_ _)
In
/gnu/store/f95ghy8mx00fc22nrvswvnpqlfdkf2nk-module-import/guix/build/utils.scm:
    616:6  0 (invoke _ . _)

/gnu/store/f95ghy8mx00fc22nrvswvnpqlfdkf2nk-module-import/guix/build/utils.scm:616:6:
In procedure invoke:
Throw to key `srfi-34' with args `(#<condition &invoke-error [program:
"/gnu/store/rbrandv7anzjxqkr40d7fkanzssslk4b-bash-minimal-4.4.19/bin/bash"
arguments: ("../glibc-2.23-hurd+libpthread-20161218/configure"
"CONFIG_SHELL=/gnu/store/rbrandv7anzjxqkr40d7fkanzssslk4b-bash-minimal-4.4.19/bin/bash"
"SHELL=/gnu/store/rbrandv7anzjxqkr40d7fkanzssslk4b-bash-minimal-4.4.19/bin/bash"
"--prefix=/gnu/store/wb4gn1d5prgc9xl8flz5vhl8alhvcdmd-glibc-hurd-headers-cross-i586-pc-gnu-2.23"
"--enable-fast-install" "--build=x86_64-unknown-linux-gnu"
"--enable-add-ons" "--host=i586-pc-gnu" "--enable-obsolete-rpc")
exit-status: 1 term-signal: #f stop-signal: #f] a47740>)'.
note: keeping build directory
`/tmp/guix-build-glibc-hurd-headers-cross-i586-pc-gnu-2.23.drv-3'
builder for
`/gnu/store/8c3s6f959aqrpwnglvwz52093hnxd4p1-glibc-hurd-headers-cross-i586-pc-gnu-2.23.drv'
failed with exit code 1
@ build-failed
/gnu/store/8c3s6f959aqrpwnglvwz52093hnxd4p1-glibc-hurd-headers-cross-i586-pc-gnu-2.23.drv
- 1 builder for
`/gnu/store/8c3s6f959aqrpwnglvwz52093hnxd4p1-glibc-hurd-headers-cross-i586-pc-gnu-2.23.drv'
failed with exit code 1
cannot build derivation
`/gnu/store/pc74fikk33drazw249ap3h5a0bz5x7bm-hurd-minimal-cross-i586-pc-gnu-0.9.drv':
1 dependencies couldn't be built
cannot build derivation
`/gnu/store/nmn0gzcds2alakyhdc50ns59azfv2b15-hurd-core-headers-cross-i586-pc-gnu-0.9.drv':
1 dependencies couldn't be built
guix build: error: build failed: build of
`/gnu/store/nmn0gzcds2alakyhdc50ns59azfv2b15-hurd-core-headers-cross-i586-pc-gnu-0.9.drv'
failed

Normally this issue should be solved by this part inside (gnu packages
cross-base)

```
         ((#:phases phases)
          `(modify-phases ,phases
             (add-before 'pre-configure 'set-cross-headers-path
               (lambda* (#:key inputs #:allow-other-keys)
                 (let* ((mach (assoc-ref inputs "gnumach-headers"))
                        (hurd (assoc-ref inputs "hurd-headers"))
                        (cpath (string-append hurd "/include:"
                                              mach "/include"))
                        )
                   (for-each (cut setenv <> cpath)
                             ',%gcc-cross-include-paths)
                   #t)))))))

```

>From what I remember, normally in the environment-variables during
cross-building there should be a CROSS_INCLUDE_PATH variable, among
others. But from what you can see in the attached environment file it
doesn't.

Any ideas?

Thank you for your time and help,
Manolis

3s6f959aqrpwnglvwz52093hnxd4p1-glibc-hurd-headers-cross-i586-pc-gnu-2.23.drv.bz2
Description: application/bzip

config.log
Description: Text Data

environment-variables
Description: Text document