gnu: Add nsis-x86_64 and nsis-i686.

* guix/build-system/scons.scm (scons-build): Add build-targets and
install-targets parameters.
* guix/build/scons-build-system.scm (build, install): Adjust
accordingly.
* doc/guix.texi (Build Systems): Document it.
* gnu/packages/installers.scm: New file,
(make-nsis): New procedure,
(nsis-x86_64, nsis-i686): New variables.
* gnu/packages/patches/nsis-env-passthru.patch: New file.
* gnu/local.mk (dist_patch_DATA, GNU_SYSTEM_MODULES): Adjust
accordingly.

3 files changed, 130 insertions, 0 deletions

diff --git a/gnu/local.mk b/gnu/local.mk
index 2451698503..0a4ee7c986 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -261,6 +261,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/imagemagick.scm			\
   %D%/packages/inklingreader.scm		\
   %D%/packages/inkscape.scm			\
+  %D%/packages/installers.scm			\
   %D%/packages/ipfs.scm			\
   %D%/packages/irc.scm  			\
   %D%/packages/iso-codes.scm			\
@@ -1145,6 +1146,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/nfs-utils-missing-headers.patch		\
   %D%/packages/patches/ngircd-handle-zombies.patch		\
   %D%/packages/patches/nm-plugin-path.patch			\
+  %D%/packages/patches/nsis-env-passthru.patch			\
   %D%/packages/patches/nss-freebl-stubs.patch			\
   %D%/packages/patches/nss-increase-test-timeout.patch		\
   %D%/packages/patches/nss-pkgconfig.patch			\
diff --git a/gnu/packages/installers.scm b/gnu/packages/installers.scm
new file mode 100644
index 0000000000..3a5f08b95a
--- /dev/null
+++ b/gnu/packages/installers.scm
@@ -0,0 +1,116 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Carl Dong <contact@carldong.me>
+;;;
+;;; 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 (gnu packages installers)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages compression)
+  #:use-module (gnu packages cross-base)
+  #:use-module (gnu packages python-xyz)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system scons)
+  #:use-module (guix utils))
+
+(define(make-nsis machine target-arch nsis-target-type)
+  (let ((triplet (string-append machine "-" "w64-mingw32")))
+    (package
+      (name (string-append "nsis-" machine))
+      (version "3.04")
+      (source (origin
+                (method url-fetch)
+                (uri (string-append "http://prdownloads.sourceforge.net/nsis/nsis-"
+                                    version "-src.tar.bz2"))
+                (sha256
+                 (base32
+                  "1xgllk2mk36ll2509hd31mfq6blgncmdzmwxj3ymrwshdh23d5b0"))
+                (patches (search-patches "nsis-env-passthru.patch"))))
+      (build-system scons-build-system)
+      (native-inputs `(("xgcc" ,(cross-gcc triplet #:libc (cross-libc triplet)))
+                       ("xbinutils" ,(cross-binutils triplet))
+                       ("mingw-w64" ,(cross-libc triplet))))
+      (inputs `(("zlib" ,zlib)))
+      (arguments
+       `(#:scons ,scons-python2
+         #:modules ((srfi srfi-1)
+                    (guix build utils)
+                    (guix build scons-build-system))
+         #:tests? #f
+         #:scons-flags `("UNICODE=yes"
+                         "SKIPUTILS=MakeLangId,Makensisw,NSIS Menu,SubStart,zip2exe"
+                         "SKIPDOC=COPYING"
+                         "STRIP_CP=no"
+                         ,(string-append "PREFIX=" %output)
+                         ,(string-append "TARGET_ARCH=" ,target-arch)
+                         ,(string-append "XGCC_W32_PREFIX=" ,triplet "-")
+                         ,(string-append "PREFIX_PLUGINAPI_INC=" (assoc-ref %build-inputs "mingw-w64") "/include/")
+                         ,(string-append "PREFIX_PLUGINAPI_LIB=" (assoc-ref %build-inputs "mingw-w64") "/lib/"))
+         #:build-targets '("makensis"
+                           "stubs"
+                           "plugins"
+                           "utils")
+         #:install-targets '("install-stubs"
+                             "install-plugins"
+                             "install-data"
+                             "install-utils"
+                             "install-compiler"
+                             "install-conf")
+         #:phases (modify-phases %standard-phases
+                    (add-before 'build 'fix-env
+                      (lambda _
+                        (define* (filter-delimited-string delimited-string predicate #:optional (delimiter #\:))
+                          ;; Given a DELIMITED-STRING delimited by DELIMITER,
+                          ;; only keep items that satisfy PREDICATE
+                          (string-join
+                           (filter predicate (string-split delimited-string delimiter))
+                           (string delimiter)))
+                        (define (mingw-path? path)
+                          (string-prefix? (assoc-ref %build-inputs "mingw-w64") path))
+                        (for-each
+                         (lambda (env-name)
+                           (let ((env-val (getenv env-name)))
+                             ;; Remove all mingw-w64 paths from env vars meant
+                             ;; for native toolchain
+                             (setenv env-name
+                                     (filter-delimited-string env-val (negate mingw-path?)))
+                             ;; Add the removed paths back into
+                             ;; CROSS_-prefixed version of env vars
+                             (setenv (string-append "CROSS_" env-name)
+                                     (filter-delimited-string env-val mingw-path?))))
+                         '("CPLUS_INCLUDE_PATH" "LIBRARY_PATH" "C_INCLUDE_PATH"))))
+                    (add-before 'build 'fix-target-detection
+                      (lambda _
+                        ;; NSIS target detection is screwed up, manually
+                        ;; change it ourselves
+                        (substitute* "Source/build.cpp" (("m_target_type=TARGET_X86ANSI")
+                                                         (string-append "m_target_type=" ,nsis-target-type))))))))
+      (home-page "http://nsis.sourceforge.net/")
+      (synopsis "A professional open source system to create Windows installers")
+      (description
+       "NSIS (Nullsoft Scriptable Install System) is a professional open
+source system to create Windows installers. It is designed to be as small and
+flexible as possible and is therefore very suitable for internet
+distribution.")
+      (license (license:non-copyleft "file://COPYING"
+                                     "See COPYING in the distribution.")))))
+
+(define-public nsis-x86_64
+  (make-nsis "x86_64" "amd64" "TARGET_AMD64"))
+
+(define-public nsis-i686
+  (make-nsis "i686" "x86" "TARGET_X86UNICODE"))
diff --git a/gnu/packages/patches/nsis-env-passthru.patch b/gnu/packages/patches/nsis-env-passthru.patch
new file mode 100644
index 0000000000..36b4092230
--- /dev/null
+++ b/gnu/packages/patches/nsis-env-passthru.patch
@@ -0,0 +1,12 @@
+--- nsis-3.04-src/SConstruct	2019-05-30 14:53:30.276775332 -0400
++++ nsis-3.04-src/SConstruct	2019-05-30 14:54:17.901232914 -0400
+@@ -77,6 +77,9 @@
+ if not toolset and not path:
+ 	defenv = Environment(TARGET_ARCH = arch)
+ 
++import os;
++defenv['ENV'] = os.environ
++
+ Export('defenv')
+ 
+ ######################################################################