/usr/share/racket/collects/setup/cross-system.rkt is in racket-common 6.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | #lang racket/base
(require "private/dirs.rkt")
(provide cross-system-type
cross-system-library-subpath
cross-installation?)
(define cross-system-table #f)
(define system-type-symbols '(os word gc link machine so-suffix so-mode fs-change))
(define (compute-cross!)
(unless cross-system-table
(define lib-dir (find-lib-dir))
(define ht (and lib-dir
(let ([f (build-path lib-dir "system.rktd")])
(and (file-exists? f)
(let ([ht (call-with-default-reading-parameterization
(lambda ()
(call-with-input-file*
f
read)))])
(and (hash? ht)
(for/and ([sym (in-list (list*
'library-subpath
'library-subpath-convention
system-type-symbols))])
(hash-ref ht sym #f))
(not
(and (for/and ([sym (in-list system-type-symbols)]
#:unless (or (eq? sym 'machine)
(eq? sym 'gc)))
(equal? (hash-ref ht sym) (system-type sym)))
(equal? (bytes->path (hash-ref ht 'library-subpath)
(hash-ref ht 'library-subpath-convention))
(system-library-subpath #f))))
ht))))))
(if ht
(set! cross-system-table ht)
(set! cross-system-table #hasheq()))))
(define cross-system-type
(case-lambda
[()
(compute-cross!)
(or (hash-ref cross-system-table 'os #f)
(system-type 'os))]
[(mode)
(unless (memq mode system-type-symbols)
(raise-argument-error
'cross-system-type
"(or/c 'os 'word 'gc 'link 'machine 'so-suffix 'so-mode 'fs-change)"
mode))
(compute-cross!)
(or (hash-ref cross-system-table mode #f)
(system-type mode))]))
(define (cross-system-library-subpath [mode (begin
(compute-cross!)
(cross-system-type 'gc))])
(unless (memq mode '(#f 3m cgc))
(raise-argument-error
'cross-system-library-subtype
"(or/c #f '3m 'cgc)"
mode))
(compute-cross!)
(define bstr (hash-ref cross-system-table 'library-subpath #f))
(cond
[bstr
(define conv (hash-ref cross-system-table 'library-subpath-convention))
(define path (bytes->path bstr conv))
(case mode
[(#f cgc) path]
[(3m) (build-path path (bytes->path #"3m" conv))])]
[else (system-library-subpath mode)]))
(define (cross-installation?)
(compute-cross!)
(positive? (hash-count cross-system-table)))
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