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>

6 files changed, 245 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.6/armhf-elf-header.patch b/meta/recipes-devtools/go/go-1.6/armhf-elf-header.patch
new file mode 100644
index 0000000000..1e3a16b319
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.6/armhf-elf-header.patch
@@ -0,0 +1,23 @@
+Encode arm EABI ( hard/soft ) calling convention in ELF header
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
+Index: go/src/cmd/link/internal/ld/elf.go
+===================================================================
+--- go.orig/src/cmd/link/internal/ld/elf.go
++++ go/src/cmd/link/internal/ld/elf.go
+@@ -827,7 +827,13 @@
+        // 32-bit architectures
+        case '5':
+                // we use EABI on both linux/arm and freebsd/arm.
+-               if HEADTYPE == obj.Hlinux || HEADTYPE == obj.Hfreebsd {
++               if HEADTYPE == obj.Hlinux {
++                       if Ctxt.Goarm == 7 {
++                               ehdr.flags = 0x5000402 // has entry point, Version5 EABI, hard float
++                       } else {
++                               ehdr.flags = 0x5000202 // has entry point, Version5 EABI, soft float
++                       }
++               } else if HEADTYPE == obj.Hfreebsd {
+                        // We set a value here that makes no indication of which
+                        // float ABI the object uses, because this is information
+                        // used by the dynamic linker to compare executables and
diff --git a/meta/recipes-devtools/go/go-1.6/fix-cc-handling.patch b/meta/recipes-devtools/go/go-1.6/fix-cc-handling.patch
new file mode 100644
index 0000000000..983323ace9
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.6/fix-cc-handling.patch
@@ -0,0 +1,50 @@
+Accept CC with multiple words in its name
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
+Index: go/src/cmd/go/build.go
+===================================================================
+--- go.orig/src/cmd/go/build.go 2015-07-29 14:48:40.323185807 -0700
++++ go/src/cmd/go/build.go      2015-07-30 07:37:40.529818586 -0700
+@@ -2805,12 +2805,24 @@
+        return b.ccompilerCmd("CC", defaultCC, objdir)
+ }
+ 
++// gccCmd returns a gcc command line prefix
++// defaultCC is defined in zdefaultcc.go, written by cmd/dist.
++func (b *builder) gccCmdForReal() []string {
++       return envList("CC", defaultCC)
++}
++
+ // gxxCmd returns a g++ command line prefix
+ // defaultCXX is defined in zdefaultcc.go, written by cmd/dist.
+ func (b *builder) gxxCmd(objdir string) []string {
+        return b.ccompilerCmd("CXX", defaultCXX, objdir)
+ }
+ 
++// gxxCmd returns a g++ command line prefix
++// defaultCXX is defined in zdefaultcc.go, written by cmd/dist.
++func (b *builder) gxxCmdForReal() []string {
++       return envList("CXX", defaultCXX)
++}
++
+ // ccompilerCmd returns a command line prefix for the given environment
+ // variable and using the default command when the variable is empty.
+ func (b *builder) ccompilerCmd(envvar, defcmd, objdir string) []string {
+Index: go/src/cmd/go/env.go
+===================================================================
+--- go.orig/src/cmd/go/env.go   2015-07-29 14:48:40.323185807 -0700
++++ go/src/cmd/go/env.go        2015-07-30 07:40:54.461655721 -0700
+@@ -52,10 +52,9 @@
+ 
+        if goos != "plan9" {
+                cmd := b.gccCmd(".")
+-               env = append(env, envVar{"CC", cmd[0]})
++               env = append(env, envVar{"CC", strings.Join(b.gccCmdForReal(), " ")})
+                env = append(env, envVar{"GOGCCFLAGS", strings.Join(cmd[3:], " ")})
+-               cmd = b.gxxCmd(".")
+-               env = append(env, envVar{"CXX", cmd[0]})
++               env = append(env, envVar{"CXX", strings.Join(b.gxxCmdForReal(), " ")})
+        }
+ 
+        if buildContext.CgoEnabled {
diff --git a/meta/recipes-devtools/go/go-1.6/fix-target-cc-for-build.patch b/meta/recipes-devtools/go/go-1.6/fix-target-cc-for-build.patch
new file mode 100644
index 0000000000..2f6156ecd2
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.6/fix-target-cc-for-build.patch
@@ -0,0 +1,17 @@
+Put Quotes around CC_FOR_TARGET since it can be mutliple words e.g. in OE
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
+Index: go/src/make.bash
+===================================================================
+--- go.orig/src/make.bash       2015-07-29 13:28:11.334031696 -0700
++++ go/src/make.bash    2015-07-29 13:36:55.814465630 -0700
+@@ -158,7 +158,7 @@
+ fi
+ 
+ echo "##### Building packages and commands for $GOOS/$GOARCH."
+-CC=$CC_FOR_TARGET "$GOTOOLDIR"/go_bootstrap install $GO_FLAGS -gcflags "$GO_GCFLAGS" -ldflags "$GO_LDFLAGS" -v std cmd
++CC="$CC_FOR_TARGET" "$GOTOOLDIR"/go_bootstrap install $GO_FLAGS -gcflags "$GO_GCFLAGS" -ldflags "$GO_LDFLAGS" -v std cmd
+ echo
+ 
+ rm -f "$GOTOOLDIR"/go_bootstrap
diff --git a/meta/recipes-devtools/go/go-1.6/gotooldir.patch b/meta/recipes-devtools/go/go-1.6/gotooldir.patch
new file mode 100644
index 0000000000..94670259f2
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.6/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)
diff --git a/meta/recipes-devtools/go/go-1.6/split-host-and-target-build.patch b/meta/recipes-devtools/go/go-1.6/split-host-and-target-build.patch
new file mode 100644
index 0000000000..afbae02b4e
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.6/split-host-and-target-build.patch
@@ -0,0 +1,63 @@
+Add new option --target-only to build target components
+Separates the host and target pieces of build
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
+Index: go/src/make.bash
+===================================================================
+--- go.orig/src/make.bash
++++ go/src/make.bash
+@@ -143,12 +143,23 @@ if [ "$1" = "--no-clean" ]; then
+        buildall=""
+        shift
+ fi
+-./cmd/dist/dist bootstrap $buildall $GO_DISTFLAGS -v # builds go_bootstrap
+-# Delay move of dist tool to now, because bootstrap may clear tool directory.
+-mv cmd/dist/dist "$GOTOOLDIR"/dist
+-echo
+ 
+-if [ "$GOHOSTARCH" != "$GOARCH" -o "$GOHOSTOS" != "$GOOS" ]; then
++do_host_build="yes"
++do_target_build="yes"
++if [ "$1" = "--target-only" ]; then
++       do_host_build="no"
++       shift
++elif [ "$1" = "--host-only" ]; then
++       do_target_build="no"
++       shift
++fi
++
++if [ "$do_host_build" = "yes" ]; then
++       ./cmd/dist/dist bootstrap $buildall $GO_DISTFLAGS -v # builds go_bootstrap
++       # Delay move of dist tool to now, because bootstrap may clear tool directory.
++       mv cmd/dist/dist "$GOTOOLDIR"/dist
++       echo
++
+        echo "##### Building packages and commands for host, $GOHOSTOS/$GOHOSTARCH."
+        # CC_FOR_TARGET is recorded as the default compiler for the go tool. When building for the host, however,
+        # use the host compiler, CC, from `cmd/dist/dist env` instead.
+@@ -157,11 +168,20 @@ if [ "$GOHOSTARCH" != "$GOARCH" -o "$GOH
+        echo
+ fi
+ 
+-echo "##### Building packages and commands for $GOOS/$GOARCH."
+-CC="$CC_FOR_TARGET" "$GOTOOLDIR"/go_bootstrap install $GO_FLAGS -gcflags "$GO_GCFLAGS" -ldflags "$GO_LDFLAGS" -v std cmd
+-echo
++if [ "$do_target_build" = "yes" ]; then
++    GO_INSTALL="${GO_TARGET_INSTALL:-std cmd}"
++    echo "##### Building packages and commands for $GOOS/$GOARCH."
++    if [ "$GOHOSTOS" = "$GOOS" -a "$GOHOSTARCH" = "$GOARCH" -a "$do_host_build" = "yes" ]; then
++       rm -rf ./host-tools
++       mkdir ./host-tools
++       mv "$GOTOOLDIR"/* ./host-tools
++       GOTOOLDIR="$PWD/host-tools"
++    fi
++    GOTOOLDIR="$GOTOOLDIR" CC="$CC_FOR_TARGET" "$GOTOOLDIR"/go_bootstrap install $GO_FLAGS -gcflags "$GO_GCFLAGS" -ldflags "$GO_LDFLAGS" -v ${GO_INSTALL}
++    echo
+ 
+-rm -f "$GOTOOLDIR"/go_bootstrap
++    rm -f "$GOTOOLDIR"/go_bootstrap
++fi
+ 
+ if [ "$1" != "--no-banner" ]; then
+        "$GOTOOLDIR"/dist banner
diff --git a/meta/recipes-devtools/go/go-1.6/syslog.patch b/meta/recipes-devtools/go/go-1.6/syslog.patch
new file mode 100644
index 0000000000..29be06f1bd
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.6/syslog.patch
@@ -0,0 +1,62 @@
+Add timeouts to logger
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
+
+diff -r -u go/src/log/syslog/syslog.go /home/achang/GOCOPY/go/src/log/syslog/syslog.go
+--- go/src/log/syslog/syslog.go 2013-11-28 13:38:28.000000000 -0800
++++ /home/achang/GOCOPY/go/src/log/syslog/syslog.go     2014-10-03 11:44:37.710403200 -0700
+@@ -33,6 +33,9 @@
+ const severityMask = 0x07
+ const facilityMask = 0xf8
+ 
++var writeTimeout = 1 * time.Second
++var connectTimeout = 1 * time.Second
++
+ const (
+        // Severity.
+ 
+@@ -100,6 +103,7 @@
+ type serverConn interface {
+        writeString(p Priority, hostname, tag, s, nl string) error
+        close() error
++       setWriteDeadline(t time.Time) error
+ }
+ 
+ type netConn struct {
+@@ -273,7 +277,11 @@
+                nl = "\n"
+        }
+ 
+-       err := w.conn.writeString(p, w.hostname, w.tag, msg, nl)
++       err := w.conn.setWriteDeadline(time.Now().Add(writeTimeout))
++       if err != nil {
++               return 0, err
++       }
++       err = w.conn.writeString(p, w.hostname, w.tag, msg, nl)
+        if err != nil {
+                return 0, err
+        }
+@@ -305,6 +313,10 @@
+        return n.conn.Close()
+ }
+ 
++func (n *netConn) setWriteDeadline(t time.Time) error {
++       return n.conn.SetWriteDeadline(t)
++}
++
+ // NewLogger creates a log.Logger whose output is written to
+ // the system log service with the specified priority. The logFlag
+ // argument is the flag set passed through to log.New to create
+diff -r -u go/src/log/syslog/syslog_unix.go /home/achang/GOCOPY/go/src/log/syslog/syslog_unix.go
+--- go/src/log/syslog/syslog_unix.go    2013-11-28 13:38:28.000000000 -0800
++++ /home/achang/GOCOPY/go/src/log/syslog/syslog_unix.go        2014-10-03 11:44:39.010403175 -0700
+@@ -19,7 +19,7 @@
+        logPaths := []string{"/dev/log", "/var/run/syslog"}
+        for _, network := range logTypes {
+                for _, path := range logPaths {
+-                       conn, err := net.Dial(network, path)
++                       conn, err := net.DialTimeout(network, path, connectTimeout)
+                        if err != nil {
+                                continue
+                        } else {