[bug#38436] [PATCH] gnu: Add gfortran-toolchain

[Konrad Hinsen <konrad.hinsen@fastmail.net>]

* gnu/packages/commencement.scm: (gfortran-toolchain): New variable.
* gnu/packages/commencement.scm: (make-gcc-toolchain): Added argument "language"
---
 gnu/packages/commencement.scm | 52 +++++++++++++++++++++++------------
 1 file changed, 34 insertions(+), 18 deletions(-)

diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index 6a382c7517..8c57af749e 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -2515,16 +2515,23 @@ COREUTILS-FINAL vs. COREUTILS, etc."
 ;;; GCC toolchain.
 ;;;

+;;; Toolchain packages combine everything needed for compilation,
+;;; and ensure that ld-wrapper comes before binutils' ld in the
+;;; user's profile, as otherwise dynamic library lookup would not
+;;; work correctly.
+
 ;; Using the following procedure, a gcc toolchain targeting glibc-2.27 can be
 ;; instantiated like this:
 ;;
 ;; (define-public gcc-glibc-2.27-toolchain
 ;;   (make-gcc-toolchain gcc glibc-2.27))

-(define* (make-gcc-toolchain gcc
-                            #:optional
-                            (libc #f))
-  "Return a complete toolchain for GCC. If LIBC is specified, target that libc."
+(define* (make-gcc-toolchain language
+                             gcc
+                             #:optional
+                             (libc #f))
+  "Return a complete toolchain for GCC. If LIBC is specified, target that libc.
+  Insert LANGUAGE into the documentation strings."
   (let ((gcc (if libc (make-gcc-libc gcc libc) gcc))
         (libc (if libc libc glibc-final)))
     (package
@@ -2557,17 +2564,19 @@ COREUTILS-FINAL vs. COREUTILS, etc."
       (search-paths (package-search-paths gcc))

       (license (package-license gcc))
-      (synopsis "Complete GCC tool chain for C/C++ development")
+      (synopsis (format #f
+                        "Complete GCC tool chain for ~a development"
+                        language))
       (description
-       "This package provides a complete GCC tool chain for C/C++ development to
-be   installed in user profiles.  This includes GCC, as well as libc (headers
-an  d binaries, plus debugging symbols in the @code{debug} output), and Binutils.")
+       (format
+        #f
+        "This package provides a complete GCC tool chain for ~a development to
+be installed in user profiles.  This includes GCC, as well as libc (headers
+and binaries, plus debugging symbols in the @code{debug} output), and Binutils."
+        language))
       (home-page "https://gcc.gnu.org/")
       (outputs '("out" "debug" "static"))

-      ;; The main raison d'être of this "meta-package" is (1) to conveniently
-      ;; install everything that we need, and (2) to make sure ld-wrapper comes
-      ;; before Binutils' ld in the user's profile.
       (inputs `(("gcc" ,gcc)
                 ("ld-wrapper" ,(car (assoc-ref %final-inputs "ld-wrapper")))
                 ("binutils" ,binutils-final)
@@ -2576,27 +2585,34 @@ an  d binaries, plus debugging symbols in the @code{debug} output),
and Binutils
                 ("libc-static" ,libc "static"))))))

 (define-public gcc-toolchain
-  (make-gcc-toolchain gcc-final))
+  (make-gcc-toolchain "C/C++" gcc-final))

 (define-public gcc-toolchain-4.8
-  (make-gcc-toolchain gcc-4.8))
+  (make-gcc-toolchain "C/C++" gcc-4.8))

 (define-public gcc-toolchain-4.9
-  (make-gcc-toolchain gcc-4.9))
+  (make-gcc-toolchain "C/C++" gcc-4.9))

 (define-public gcc-toolchain-5
-  (make-gcc-toolchain gcc-5))
+  (make-gcc-toolchain "C/C++" gcc-5))

 (define-public gcc-toolchain-6
-  (make-gcc-toolchain gcc-6))
+  (make-gcc-toolchain "C/C++" gcc-6))

 (define-public gcc-toolchain-7
   gcc-toolchain)

 (define-public gcc-toolchain-8
-  (make-gcc-toolchain gcc-8))
+  (make-gcc-toolchain "C/C++" gcc-8))

 (define-public gcc-toolchain-9
-  (make-gcc-toolchain gcc-9))
+  (make-gcc-toolchain "C/C++" gcc-9))
+
+;; Provide the toolchain package only for the version of gfortran
+;; that is used by Guix intenally to build Fortran libraries,
+;; because combining code compiled with different versions can
+;; cause problems.
+(define-public gfortran-toolchain
+  (make-gcc-toolchain "Fortran" gfortran))

 ;;; commencement.scm ends here
-- 
2.24.0