3 files changed, 144 insertions, 6 deletions
diff --git a/guix/build/android-ndk-build-system.scm b/guix/build/android-ndk-build-system.scm
new file mode 100644
index 0000000000..3c8f726d1d
--- /dev/null
+++ b/guix/build/android-ndk-build-system.scm
@@ -0,0 +1,88 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Danny Milosavljevic <dannym@scratchpost.org>
+;;;
+;;; 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 android-ndk-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build syscalls)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 popen)
+  #:use-module (ice-9 rdelim)
+  #:use-module (ice-9 ftw)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 match)
+  #:use-module (rnrs io ports)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            android-ndk-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the Android NDK build system.
+;;
+;; Code:
+
+(define* (configure #:key inputs outputs #:allow-other-keys)
+  (let ((library-directories (filter-map (match-lambda
+                                          ((name . path)
+                                           (if (eq? 'directory (stat:type (stat path)))
+                                               path
+                                               #f)))
+                                         inputs)))
+    (setenv "CC" "gcc")
+    (setenv "CXX" "g++")
+    (setenv "CPPFLAGS"
+     (string-join
+      (map (cut string-append "-I " <> "/include") library-directories)
+      " "))
+    (setenv "LDFLAGS"
+     (string-append "-L . "
+                    (string-join
+                     (map (lambda (x)
+                            (string-append "-L " x "/lib" " -Wl,-rpath=" x "/lib"))
+                          library-directories)
+                     " ")))
+    #t))
+
+(define* (install #:key inputs outputs (make-flags '()) #:allow-other-keys)
+  (let ((out (assoc-ref outputs "out")))
+    (apply invoke "make" "install"
+           (string-append "prefix=" out)
+           make-flags)
+    #t))
+
+(define* (check #:key target inputs outputs (tests? (not target)) (make-flags '()) #:allow-other-keys)
+  (if tests?
+      (begin
+        (apply invoke "make" "check" make-flags)
+        (when (and (file-exists? "tests") tests?)
+          (with-directory-excursion "tests"
+            (apply invoke "make" "check" make-flags))))
+      (format #t "test suite not run~%"))
+  #t)
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (replace 'configure configure)
+    (replace 'install install)
+    (replace 'check check)))
+
+(define* (android-ndk-build #:key inputs (phases %standard-phases)
+                            #:allow-other-keys #:rest args)
+  "Build the given Android NDK package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
diff --git a/guix/build/profiles.scm b/guix/build/profiles.scm
index b4160fba1b..819688a913 100644
--- a/guix/build/profiles.scm
+++ b/guix/build/profiles.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -24,6 +24,7 @@
   #:use-module (ice-9 ftw)
   #:use-module (ice-9 match)
   #:use-module (ice-9 pretty-print)
+  #:re-export (symlink-relative)                  ;for convenience
   #:export (ensure-writable-directory
             build-profile))
 
@@ -129,12 +130,15 @@ instead make DIRECTORY a \"real\" directory containing symlinks."
             (apply throw args))))))
 
 (define* (build-profile output inputs
-                        #:key manifest search-paths)
-  "Build a user profile from INPUTS in directory OUTPUT.  Write MANIFEST, an
-sexp, to OUTPUT/manifest.  Create OUTPUT/etc/profile with Bash definitions for
--all the variables listed in SEARCH-PATHS."
+                        #:key manifest search-paths
+                        (symlink symlink))
+  "Build a user profile from INPUTS in directory OUTPUT, using SYMLINK to
+create symlinks.  Write MANIFEST, an sexp, to OUTPUT/manifest.  Create
+OUTPUT/etc/profile with Bash definitions for -all the variables listed in
+SEARCH-PATHS."
   ;; Make the symlinks.
   (union-build output inputs
+               #:symlink symlink
                #:log-port (%make-void-port "w"))
 
   ;; Store meta-data.
diff --git a/guix/build/union.scm b/guix/build/union.scm
index 1179f1234b..24b366af45 100644
--- a/guix/build/union.scm
+++ b/guix/build/union.scm
@@ -27,7 +27,10 @@
   #:use-module (rnrs io ports)
   #:export (union-build
 
-            warn-about-collision))
+            warn-about-collision
+
+            relative-file-name
+            symlink-relative))
 
 ;;; Commentary:
 ;;;
@@ -174,4 +177,47 @@ returns #f, skip the faulty file altogether."
 
   (union-of-directories output (delete-duplicates inputs)))
 
+
+;;;
+;;; Relative symlinks.
+;;;
+
+(define %not-slash
+  (char-set-complement (char-set #\/)))
+
+(define (relative-file-name reference file)
+  "Given REFERENCE and FILE, both of which are absolute file names, return the
+file name of FILE relative to REFERENCE.
+
+  (relative-file-name \"/gnu/store/foo\" \"/gnu/store/bin/bar\")
+  => \"../bin/bar\"
+
+Note that this is from a purely lexical standpoint; conversely, \"..\" is
+*not* resolved lexically on POSIX in the presence of symlinks."
+  (if (and (string-prefix? "/" file) (string-prefix? "/" reference))
+      (let loop ((reference (string-tokenize reference %not-slash))
+                 (file      (string-tokenize file %not-slash)))
+        (define (finish)
+          (string-join (append (make-list (length reference) "..") file)
+                       "/"))
+
+        (match reference
+          (()
+           (finish))
+          ((head . tail)
+           (match file
+             (()
+              (finish))
+             ((head* . tail*)
+              (if (string=? head head*)
+                  (loop tail tail*)
+                  (finish)))))))
+      file))
+
+(define (symlink-relative old new)
+  "Assuming both OLD and NEW are absolute file names, make NEW a symlink to
+OLD, but using a relative file name."
+  (symlink (relative-file-name (dirname new) old)
+           new))
+
 ;;; union.scm ends here