bug#56633: [core-updates] Some cross-derivations cannot be computed

[Marius Bakke]

Hello Guix!

On the 'core-updates' branch, running 'guix build -d' fails on some
cross-derivations (notably anything that depends on NSPR, but there may
be others).

Somehow both TARGET and SYSTEM ends up #false. Any ideas to what is
going on?

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$ ./pre-inst-env guix build --target=aarch64-linux-gnu nspr -d

Backtrace:
In guix/monads.scm:
    471:9 19 (_ _)
In guix/packages.scm:
   1553:7 18 (_ _)
In guix/store.scm:
  1996:13 17 (_ #<store-connection 256.99 7f5816372e60>)
In guix/packages.scm:
  1878:37 16 (_)
  1798:39 15 (bag->derivation #<<bag> name: "ld-wrapper-aarch64-linux-gnu-0" 
system: #f target: #f build-inputs: () host-inputs: (("binutils" #<package 
binutils-cross-aarch64-linux-gnu@2.38 gnu/packages/cross-base.scm:69 
7f58054e12c0>) ("guile" #<package guile@3.0.8 guix/build-system/gnu.scm:145 
7f5804e65420>) ("bash" #<package bash@5.1.16 gnu/packages/bash.scm:131 
7f5804bae210>) ("wrapper" "…> …)
   1291:4 14 (bag-transitive-inputs _)
  1074:23 13 (transitive-inputs _)
  1415:36 12 (propagated-inputs _)
In srfi/srfi-1.scm:
   586:29 11 (map1 (("libunistring" #<package libunistring@1.0 
gnu/packages/bootstrap.scm:297 7f58054e1000>) ("bdw-gc" #<package libgc@8.0.6 
gnu/packages/bootstrap.scm:297 7f58054e5f20>)))
   586:17 10 (map1 (("bdw-gc" #<package libgc@8.0.6 
gnu/packages/bootstrap.scm:297 7f58054e5f20>)))
In guix/packages.scm:
  1370:20  9 (rewrite ("bdw-gc" #<package libgc@8.0.6 
gnu/packages/bootstrap.scm:297 7f58054e5f20>))
In guix/memoization.scm:
    101:0  8 (_ #<hash-table 7f5804e64be0 2/31> #<package libgc@8.0.6 
gnu/packages/bootstrap.scm:297 7f58054e5f20> _)
In guix/packages.scm:
  1384:13  7 (_)
In guix/build-system/gnu.scm:
   157:33  6 (cut? _)
In gnu/packages/bdw-gc.scm:
    61:15  5 (arguments #<package libgc@8.0.6 gnu/packages/bootstrap.scm:297 
7f58054e5f20>)
In guix/utils.scm:
    672:7  4 (target-hurd? _)
In unknown file:
           3 (string-suffix? "-gnu" #f #<undefined> #<undefined> #<undefined> 
#<undefined>)
In ice-9/boot-9.scm:
  1685:16  2 (raise-exception _ #:continuable? _)
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure string-suffix?: Wrong type argument in position 2 (expecting 
string): #f
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