bug#36813: 'lower-gexp' does not respect 'system' or 'target' keywords

[Jakob L. Kreuze]

Hi,

I believe there is an issue with 'lower-gexp'. Running the following
snippet to lower a G-Expression for "i686-linux" yields output that
references store paths built for x86_64. In this case, the Guile
interpreter used is an x86_64 binary.

#+BEGIN_SRC scheme
(define (display-exp exp)
  (mlet* %store-monad ((lowered (lower-gexp exp
                                            #:system "i686-linux"
                                            #:target "i686-linux"))
                       (to-build -> (cons (lowered-gexp-guile lowered)
                                          (lowered-gexp-inputs lowered)))
                       (_ (built-derivations to-build)))
    (return (format #t "~a~%" (lowered-gexp-sexp lowered)))))

(with-store store
  (run-with-store store
    (display-exp #~(primitive-load #$(switch-system-program %system)))))
#+END_SRC

jakob@Epsilon ~ $ guile ~/test.scm 
(primitive-load 
/gnu/store/v7v1b7375j9j82dvfycv56v36nv5jq3y-switch-to-system.scm)
jakob@Epsilon ~ $ cat 
/gnu/store/v7v1b7375j9j82dvfycv56v36nv5jq3y-switch-to-system.scm
#!/gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile 
--no-auto-compile
!#
...
jakob@Epsilon ~ $ file 
/gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile
/gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile: ELF 64-bit 
LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter 
/gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ld-linux-x86-64.so.2,
 for GNU/Linux 2.6.32, not stripped

This doesn't seem to be an issue if '%current-system' is parameterized,
as in the following.

#+BEGIN_SRC scheme
(parameterize ((%current-system "i686-linux"))
  (with-store store
    (run-with-store store
      (display-exp #~(primitive-load #$(switch-system-program %system))))))
#+END_SRC

Regards,
Jakob

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