go: Add recipes for golang compilers and tools

* This is converging the recipes for go from
  meta-virtualization and oe-meta-go

* Add recipes for go 1.7

* go.bbclass is added to ease out writing
  recipes for go packages

* go-examples: Add an example, helloworld written in go
  This should serve as temlate for writing go recipes

* Disable for musl, at least for now

* Disable for x32/ppc32 which is not supported

(From OE-Core rev: 78615e9260fb5d6569de4883521b049717fa4340)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.7/gotooldir.patch b/meta/recipes-devtools/go/go-1.7/gotooldir.patch
new file mode 100644
index 0000000000..94670259f2
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.7/gotooldir.patch
@@ -0,0 +1,30 @@
+Define tooldir in relation to GOTOOLDIR env var
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
+Index: go/src/go/build/build.go
+===================================================================
+--- go.orig/src/go/build/build.go
++++ go/src/go/build/build.go
+@@ -1388,7 +1388,7 @@ func init() {
+ }
+ 
+ // ToolDir is the directory containing build tools.
+-var ToolDir = filepath.Join(runtime.GOROOT(), "pkg/tool/"+runtime.GOOS+"_"+runtime.GOARCH)
++var ToolDir = envOr("GOTOOLDIR", filepath.Join(runtime.GOROOT(), "pkg/tool/"+runtime.GOOS+"_"+runtime.GOARCH))
+ 
+ // IsLocalImport reports whether the import path is
+ // a local import path, like ".", "..", "./foo", or "../foo".
+Index: go/src/cmd/go/build.go
+===================================================================
+--- go.orig/src/cmd/go/build.go
++++ go/src/cmd/go/build.go
+@@ -1312,7 +1312,7 @@ func (b *builder) build(a *action) (err
+                }
+ 
+                cgoExe := tool("cgo")
+-               if a.cgo != nil && a.cgo.target != "" {
++               if a.cgo != nil && a.cgo.target != "" && os.Getenv("GOTOOLDIR") == "" {
+                        cgoExe = a.cgo.target
+                }
+                outGo, outObj, err := b.cgo(a.p, cgoExe, obj, pcCFLAGS, pcLDFLAGS, cgofiles, gccfiles, cxxfiles, a.p.MFiles)