Cross compiling libxml2

[John Darrington <john@darrington.wattle.id.au>]

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Trying to cross-compile several packages fails.  One reason is that many (inputs ...)
should be declared as (native-inputs ...) - I'm working on this problem.

But another problem which I'm not sure how to fix is that (assoc-ref inputs "libc")
returns false.  Hence the build fails:

Backtrace:
In ice-9/boot-9.scm:
  63: 19 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 18 [eval # #]
In ice-9/boot-9.scm:
2320: 17 [save-module-excursion #<procedure a073de0 at ice-9/boot-9.scm:3961:3 ()>]
3966: 16 [#<procedure a073de0 at ice-9/boot-9.scm:3961:3 ()>]
1645: 15 [%start-stack load-stack ...]
1650: 14 [#<procedure a076df8 ()>]
In unknown file:
   ?: 13 [primitive-load "/nix/store/3kpip8ls3nixclhi44qg9lnb5bfraca5-libxml2-2.9.0-guile-builder"]
In ice-9/eval.scm:
 387: 12 [eval # ()]
In srfi/srfi-1.scm:
 830: 11 [every1 #<procedure a212490 at /nix/store/d1qnsj2wf59m067qilasi61kgqs5wy3p-module-import/guix/build/gnu-build-system.scm:356:9 
In /nix/store/d1qnsj2wf59m067qilasi61kgqs5wy3p-module-import/guix/build/gnu-build-system.scm:
 360: 10 [#<procedure a212490 at /nix/store/d1qnsj2wf59m067qilasi61kgqs5wy3p-module-import/guix/build/gnu-build-system.scm:356:9 (expr)>
In ice-9/eval.scm:
 432: 9 [eval # #]
In ice-9/boot-9.scm:
 171: 8 [with-throw-handler #t ...]
 793: 7 [call-with-input-file "setup.py" ...]
In /nix/store/d1qnsj2wf59m067qilasi61kgqs5wy3p-module-import/guix/build/utils.scm:
 339: 6 [#<procedure a14c000 at /nix/store/d1qnsj2wf59m067qilasi61kgqs5wy3p-module-import/guix/build/utils.scm:338:10 (in)> #<input: set
 364: 5 [#<procedure a3b0b30 at /nix/store/d1qnsj2wf59m067qilasi61kgqs5wy3p-module-import/guix/build/utils.scm:360:6 (in out)> #<input: 
In srfi/srfi-1.scm:
 465: 4 [fold #<procedure a211510 at /nix/store/d1qnsj2wf59m067qilasi61kgqs5wy3p-module-import/guix/build/utils.scm:364:32 (r+p line)> .
In ice-9/eval.scm:
 387: 3 [eval # #]
 387: 2 [eval # #]
In unknown file:
   ?: 1 [string-append #f "/include"]
In ice-9/boot-9.scm:
 106: 0 [#<procedure a14c020 at ice-9/boot-9.scm:97:6 (thrown-k . args)> wrong-type-arg ...]

ice-9/boot-9.scm:106:20: In procedure #<procedure a14c020 at ice-9/boot-9.scm:97:6 (thrown-k . args)>:
ice-9/boot-9.scm:106:20: In procedure string-append: Wrong type (expecting string): #f
builder for `/nix/store/2phv2v237jb92cnd7c1f8fjhn1a3mgvx-libxml2-2.9.0.drv' failed with exit code 1


So it would seem that the alist inputs is incorrect when cross-compiling.

J'

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