adding go_compiler providers

var/spack/repos/builtin/packages/gcc/package.py

@@ -62,6 +62,9 @@ class Gcc(Package):
     depends_on("binutils~libiberty", when='+binutils ~gold')
     depends_on("binutils~libiberty+gold", when='+binutils +gold')
 
+    if sys.platform != 'darwin':
+        provides('go_compiler' when='@4.7.1:')
+
     # TODO: integrate these libraries.
     #depends_on("ppl")
     #depends_on("cloog")

var/spack/repos/builtin/packages/go/package.py

@@ -12,12 +12,14 @@ class Go(Package):
     version('1.4.2', git='https://go.googlesource.com/go', tag='go1.4.2')
     version('1.5.0', git='https://go.googlesource.com/go', tag='go1.5.0')
 
+
+    provides('go_compiler')
     # to-do, make non-c self-hosting compilers possible
-    depends_on('go@:1.4.2', when='@1.5:')
+    # should be go_compiler, but that creates an infinite loop
+    depends_on('gcc', when='@1.5:')
 
     def install(self, spec, prefix):
       os.environ['GOROOT'] = os.getcwd()
-      os.environ['GOBIN'] = join_path(os.getcwd(), 'bin')
       os.environ['GOROOT_FINAL'] = prefix
       bash = which('bash')
       bash('-c', 'env')