gnu: Add GCJ

* gnu/packages/gcc.scm (gcj-4.8, ecj-bootstrap-4.8): New variables.
* gnu/packages/javac.in: New file.
* gnu-system.am (MISC_DISTRO_FILES): Add it.
* Makefile.am (nobase_dist_guilemodule_DATA): Add MISC_DISTRO_FILES.

Makefile.am

@@ -129,7 +129,9 @@ EXAMPLES =					\
 
 GOBJECTS = $(MODULES:%.scm=%.go) guix/config.go guix/tests.go
 
-nobase_dist_guilemodule_DATA = $(MODULES) $(KCONFIGS) $(EXAMPLES)
+nobase_dist_guilemodule_DATA =                  \
+  $(MODULES) $(KCONFIGS) $(EXAMPLES)            \
+  $(MISC_DISTRO_FILES)
 nobase_nodist_guilemodule_DATA = $(GOBJECTS) guix/config.scm
 
 # Do we need to provide our own non-broken (srfi srfi-37) module?

gnu-system.am

@@ -518,6 +518,8 @@ dist_patch_DATA =						\
   gnu/packages/patches/xfce4-panel-plugins.patch		\
   gnu/packages/patches/xmodmap-asprintf.patch
 
+MISC_DISTRO_FILES = gnu/packages/javac.in
+
 bootstrapdir = $(guilemoduledir)/gnu/packages/bootstrap
 bootstrap_x86_64_linuxdir = $(bootstrapdir)/x86_64-linux
 bootstrap_i686_linuxdir = $(bootstrapdir)/i686-linux

gnu/packages/gcc.scm

@@ -26,9 +26,11 @@
   #:use-module (gnu packages multiprecision)
   #:use-module (gnu packages texinfo)
   #:use-module (gnu packages elf)
+  #:use-module ((gnu packages perl) #:select (perl))
   #:use-module (guix packages)
   #:use-module (guix download)
   #:use-module (guix build-system gnu)
+  #:use-module (guix build-system trivial)
   #:use-module (guix utils)
   #:use-module (ice-9 regex))
 
@@ -336,6 +338,77 @@ Go.  It also includes runtime support libraries for these languages.")
               ;; a cyclic dependency.  <http://debbugs.gnu.org/18101>
               #:separate-lib-output? #f))
 
+(define-public gcj-4.8
+  (package (inherit gcc-4.8)
+    (name "gcj")
+    (inputs
+     `(("fastjar" ,fastjar)
+       ("perl" ,perl)
+       ("javac.in" ,(search-path %load-path
+                                 "gnu/packages/javac.in"))
+       ("ecj-bootstrap" ,ecj-bootstrap-4.8)
+       ,@(package-inputs gcc-4.8)))
+    ;; Suppress the separate "lib" output, because otherwise the
+    ;; "lib" and "out" outputs would refer to each other, creating
+    ;; a cyclic dependency.  <http://debbugs.gnu.org/18101>
+    (outputs
+     (delete "lib" (package-outputs gcc-4.8)))
+    (arguments
+     (substitute-keyword-arguments `(#:modules ((guix build gnu-build-system)
+                                                (guix build utils)
+                                                (ice-9 regex)
+                                                (srfi srfi-1)
+                                                (srfi srfi-26))
+                                               ,@(package-arguments gcc-4.8))
+       ((#:configure-flags flags)
+        `(let ((ecj (assoc-ref %build-inputs "ecj-bootstrap")))
+           `("--enable-java-home"
+             "--enable-gjdoc"
+             ,(string-append "--with-ecj-jar=" ecj)
+             "--enable-languages=java"
+             ,@(remove (cut string-match "--enable-languages.*" <>)
+                       ,flags))))
+        ((#:phases phases)
+         `(alist-cons-after
+           'install 'install-javac-and-javap-wrappers
+           (lambda _
+             (let* ((javac  (assoc-ref %build-inputs "javac.in"))
+                    (ecj    (assoc-ref %build-inputs "ecj-bootstrap"))
+                    (gcj    (assoc-ref %outputs "out"))
+                    (gcjbin (string-append gcj "/bin/"))
+                    (jvm    (string-append gcj "/lib/jvm/"))
+                    (target (string-append jvm "/bin/javac")))
+
+               (symlink (string-append gcjbin "jcf-dump")
+                        (string-append jvm "/bin/javap"))
+
+               (copy-file ecj (string-append gcj "/share/java/ecj.jar"))
+
+               ;; Create javac wrapper from the template javac.in by
+               ;; replacing the @VARIABLES@ with paths.
+               (copy-file javac target)
+               (patch-shebang target)
+               (substitute* target
+                 (("@JAVA@")
+                  (string-append jvm "/bin/java"))
+                 (("@ECJ_JAR@")
+                  (string-append gcj "/share/java/ecj.jar"))
+                 (("@RT_JAR@")
+                  (string-append jvm "/jre/lib/rt.jar"))
+                 (("@TOOLS_JAR@")
+                  (string-append jvm "/lib/tools.jar")))
+               (chmod target #o755)
+               #t))
+           ,phases))))))
+
+(define ecj-bootstrap-4.8
+  (origin
+    (method url-fetch)
+    (uri "ftp://sourceware.org/pub/java/ecj-4.8.jar")
+    (sha256
+     (base32
+      "10fpqfbdzff1zcbxzh66xc8xbij9saykcj4xzm19wk9p3n7i5zcq"))))
+
 (define-public gcc-objc-4.8
   (custom-gcc gcc-4.8 "gcc-objc" '("objc")))
 

gnu/packages/javac.in

@@ -0,0 +1,61 @@
+#!/usr/bin/perl -w
+
+# Taken from Gentoo:
+# http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/dev-java/gcj-jdk/files/javac.in
+
+use strict;
+use constant NO_DUP_ARGS => qw(-source -target -d -encoding);
+use constant STRIP_ARGS => qw(-Werror -implicit:none -J-Xbootclasspath/p:);
+
+my $ECJ_WARNINGS="-nowarn";
+
+my ( @bcoption, @source15, @target15, @cp );
+push @bcoption, '-bootclasspath', '@RT_JAR@:@TOOLS_JAR@'
+    unless grep {$_ eq '-bootclasspath'} @ARGV;
+push @source15, '-source', '1.5'
+    unless grep {$_ eq '-source'} @ARGV;
+push @target15, '-target', '1.5'
+    unless grep {$_ eq '-target'} @ARGV;  
+push @cp, '-cp', '.'
+    unless grep {$_ =~ '\-c(p|lasspath)'} @ARGV or $ENV{CLASSPATH};
+my @ecj_parms = ($ECJ_WARNINGS, @bcoption, @source15, @target15, @cp);
+
+# Work around ecj's inability to handle duplicate command-line
+# options and unknown javac options.
+sub gen_ecj_opts
+{
+    my @new_args = @{$_[0]};
+
+    for my $opt (NO_DUP_ARGS) 
+    {
+	my @indices = reverse grep {$new_args[$_] eq $opt} 0..$#new_args;
+	if (@indices > 1) {
+	    shift @indices;    # keep last instance only
+	    splice @new_args, $_, 2 for @indices;
+	}
+    }
+
+    for my $opt (STRIP_ARGS) 
+    {
+	my @indices = reverse grep {$new_args[$_] eq $opt} 0..$#new_args;
+	splice @new_args, $_, 1 for @indices;
+    }
+
+    return \@new_args;
+}
+
+sub split_vm_args
+{
+    my @new_args = @{$_[0]};
+
+    my @vm_args = map { substr $_, 2 } grep $_ =~ /^-J/, @new_args;
+    my @javac_args = grep $_ !~ /^-J/, @new_args;
+
+    return (\@vm_args, \@javac_args);
+}
+
+my ($vm_args, $javac_args) = split_vm_args (gen_ecj_opts( \@ARGV ));
+my @CLASSPATH = ('@ECJ_JAR@');
+push @CLASSPATH, split /:/, $ENV{"CLASSPATH"} if exists $ENV{"CLASSPATH"};
+$ENV{"CLASSPATH"} = join ':', @CLASSPATH;
+exec '@JAVA@', @$vm_args, 'org.eclipse.jdt.internal.compiler.batch.Main', @ecj_parms, @$javac_args;