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#| Copyright (C) 2025 Peter McGoron
 |
 | This program is free software: you can redistribute it and/or modify it
 | under the terms of the GNU General Public License as published by the
 | Free Software Foundation, either version 3 of the License, or (at your
 | option) any later version.
 |
 | This program is distributed in the hope that it will be useful, but
 | WITHOUT ANY WARRANTY; without even the implied warranty of
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 | General Public License for more details.
 |
 | You should have received a copy of the GNU General Public License along
 | with this program.  If not, see <https://www.gnu.org/licenses/>.
 |#

(define-module (mcgoron guix gauche-build-system)
  #:use-module (guix build utils))

(define-public gauche-configure
(lambda* (#:key build target outputs
          (configure-flags '()) out-of-source?
          (configure-file-name "configure")
          #:allow-other-keys)
  ;; Copied from gnu-build-system.scm, rev. f0c0769189d11debf7b237a02695c44c9773d52a
  ;; modified for Gauche.
  ;; Allows for the configure file to have a different name (not tested).
  (define (package-name)
    (let* ((out  (assoc-ref outputs "out"))
           (base (basename out))
           (dash (string-rindex base #\-)))
      ;; XXX: We'd rather use `package-name->name+version' or similar.
      (string-drop (if dash
                       (substring base 0 dash)
                       base)
                   (+ 1 (string-index base #\-)))))

  (let* ((prefix     (assoc-ref outputs "out"))
         (bindir     (assoc-ref outputs "bin"))
         (libdir     (assoc-ref outputs "lib"))
         (includedir (assoc-ref outputs "include"))
         (docdir     (assoc-ref outputs "doc"))
         (flags      `(,@(if target             ; cross building
                             '("CC_FOR_BUILD=gcc")
                             '())
                       ,(string-append "--prefix=" prefix)
                       ;; Produce multiple outputs when specific output names
                       ;; are recognized.
                       ,@(if bindir
                              (list (string-append "--bindir=" bindir "/bin"))
                              '())
                       ,@(if libdir
                              (cons (string-append "--libdir=" libdir "/lib")
                                    (if includedir
                                        '()
                                        (list
                                         (string-append "--includedir="
                                                        libdir "/include"))))
                              '())
                       ,@(if includedir
                             (list (string-append "--includedir="
                                                  includedir "/include"))
                             '())
                       ,@(if docdir
                             (list (string-append "--docdir=" docdir
                                                  "/share/doc/" (package-name)))
                             '())
                       ,@(if build
                             (list (string-append "--build=" build))
                             '())
                       ,@(if target               ; cross building
                             (list (string-append "--host=" target))
                             '())
                       ,@configure-flags))
         (abs-srcdir (getcwd))
         (srcdir     (if out-of-source?
                         (string-append "../" (basename abs-srcdir))
                         ".")))
    (format #t "source directory: ~s (relative from build: ~s)~%"
            abs-srcdir srcdir)
    (if out-of-source?
        (begin
          (mkdir "../build")
          (chdir "../build")))
    (format #t "build directory: ~s~%" (getcwd))
    (format #t "configure flags: ~s~%" flags)

    ;; Gauche configure scripts are written in Gauche.
    ;;
    ;; Call `configure' with a relative path.  Otherwise, GCC's build system
    ;; (for instance) records absolute source file names, which typically
    ;; contain the hash part of the `.drv' file, leading to a reference leak.
    (apply invoke "gosh"
           (string-append srcdir "/" configure-file-name)
           flags))))