build-system: Add 'meson-build-system'.

* Makefile.am (MODULES): Add 'guix/build-system/meson.scm' and
'guix/build/meson-build-system.scm'.
* guix/build-system/meson.scm: New file.
* guix/build/meson-build-system.scm: New file.
* doc/guix.texi (Build Systems): Add 'meson-build-system'.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 150 insertions, 0 deletions

diff --git a/guix/build/meson-build-system.scm b/guix/build/meson-build-system.scm
new file mode 100644
index 0000000000..2b92240c52
--- /dev/null
+++ b/guix/build/meson-build-system.scm
@@ -0,0 +1,150 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Peter Mikkelsen <petermikkelsen10@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix 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.
+;;;
+;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build meson-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module ((guix build glib-or-gtk-build-system) #:prefix glib-or-gtk:)
+  #:use-module (guix build utils)
+  #:use-module (guix build rpath)
+  #:use-module (guix build gremlin)
+  #:use-module (guix elf)
+  #:use-module (ice-9 match)
+  #:use-module (rnrs io ports)
+  #:use-module (srfi srfi-1)
+  #:export (%standard-phases
+            meson-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard meson build procedure.
+;;
+;; Code:
+
+(define* (configure #:key outputs configure-flags build-type
+                    #:allow-other-keys)
+  "Configure the given package."
+  (let* ((out (assoc-ref outputs "out"))
+         (source-dir (getcwd))
+         (build-dir "../build")
+         (prefix (assoc-ref outputs "out"))
+         (args `(,(string-append "--prefix=" prefix)
+                 ,(string-append "--buildtype=" build-type)
+                 ,@configure-flags
+                 ,source-dir)))
+    (mkdir build-dir)
+    (chdir build-dir)
+    (zero? (apply system* "meson" args))))
+
+(define* (build #:key parallel-build?
+                #:allow-other-keys)
+  "Build a given meson package."
+  (zero? (apply system* "ninja"
+                (if parallel-build?
+                    `("-j" ,(number->string (parallel-job-count)))
+                    '("-j" "1")))))
+
+(define* (check #:key test-target parallel-tests? tests?
+                #:allow-other-keys)
+  (setenv "MESON_TESTTHREADS"
+          (if parallel-tests?
+              (number->string (parallel-job-count))
+              "1"))
+  (if tests?
+      (zero? (system* "ninja" test-target))
+      (begin
+        (format #t "test suite not run~%")
+        #t)))
+
+(define* (install #:rest args)
+  (zero? (system* "ninja" "install")))
+
+(define* (fix-runpath #:key (elf-directories '("lib" "lib64" "libexec"
+                                               "bin" "sbin"))
+                      outputs #:allow-other-keys)
+  "Try to make sure all ELF files in ELF-DIRECTORIES are able to find their
+local dependencies in their RUNPATH, by searching for the needed libraries in
+the directories of the package, and adding them to the RUNPATH if needed.
+Also shrink the RUNPATH to what is needed,
+since a lot of directories are left over from the build phase of meson,
+for example libraries only needed for the tests."
+
+  ;; Find the directories (if any) that contains DEP-NAME.  The directories
+  ;; searched are the ones that ELF-FILES are in.
+  (define (find-deps dep-name elf-files)
+    (map dirname (filter (lambda (file)
+                           (string=? dep-name (basename file)))
+                         elf-files)))
+
+  ;; Return a list of libraries that FILE needs.
+  (define (file-needed file)
+    (let* ((elf (call-with-input-file file
+                  (compose parse-elf get-bytevector-all)))
+           (dyninfo (elf-dynamic-info elf)))
+      (if dyninfo
+          (elf-dynamic-info-needed dyninfo)
+          '())))
+
+
+  ;; If FILE needs any libs that are part of ELF-FILES, the RUNPATH
+  ;; is modified accordingly.
+  (define (handle-file file elf-files)
+    (let* ((dep-dirs (concatenate (map (lambda (dep-name)
+                                         (find-deps dep-name elf-files))
+                                       (file-needed file)))))
+      (unless (null? dep-dirs)
+        (augment-rpath file (string-join dep-dirs ":")))))
+
+  (define handle-output
+    (match-lambda
+      ((output . directory)
+       (let* ((elf-dirnames (map (lambda (subdir)
+                                   (string-append directory "/" subdir))
+                                 elf-directories))
+              (existing-elf-dirs (filter (lambda (dir)
+                                            (and (file-exists? dir)
+                                                 (file-is-directory? dir)))
+                                          elf-dirnames))
+              (elf-pred (lambda (name stat)
+                          (elf-file? name)))
+              (elf-list (concatenate (map (lambda (dir)
+                                            (find-files dir elf-pred))
+                                          existing-elf-dirs))))
+         (for-each (lambda (elf-file)
+                     (system* "patchelf" "--shrink-rpath" elf-file)
+                     (handle-file elf-file elf-list))
+                   elf-list)))))
+  (for-each handle-output outputs)
+  #t)
+
+(define %standard-phases
+  ;; The standard-phases of glib-or-gtk contains a superset of the phases
+  ;; from the gnu-build-system.  If the glib-or-gtk? key is #f (the default)
+  ;; then the extra phases will be removed again in (guix build-system meson).
+  (modify-phases glib-or-gtk:%standard-phases
+    (replace 'configure configure)
+    (replace 'build build)
+    (replace 'check check)
+    (replace 'install install)
+    (add-after 'strip 'fix-runpath fix-runpath)))
+
+(define* (meson-build #:key inputs phases
+                      #:allow-other-keys #:rest args)
+  "Build the given package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; meson-build-system.scm ends here