(define-module (glicid utils)
 #:use-module (guix packages)
 #:use-module (guix transformations)
 #:use-module (gnu packages gcc)
 #:use-module (glicid packages gcc)
 #:use-module (gnu packages commencement)
 #:export (latest-version)
 #:export (gcc11-instead-of-gcc)
 #:export (gcc10-instead-of-gcc)
 
 )
;; helper function
;; return latest version of 2 packages

(define (latest-version v1 v2) (if (string> (package-version v1) (package-version v2)) v1 v2))

(define gcc11-instead-of-gcc
  ;; This is a procedure to replace GCC by GCC11,
  ;; recursively.
;  (package-input-rewriting/spec `((,gcc-toolchain . ,(const gcc-toolchain-11)))))
  (package-input-rewriting `(
                             (,gcc-toolchain . ,gcc-toolchain-11)
                             (,gfortran-toolchain . ,gfortran-toolchain-11)
                            )
  )
)

(define gcc10-instead-of-gcc
  ;; This is a procedure to replace GCC by GCC10,
  ;; recursively.
;  (package-input-rewriting/spec `((,gcc-toolchain . ,(const gcc-toolchain-10)))))
  (package-input-rewriting `((,gcc-toolchain . ,gcc-toolchain-10))))