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

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

1 files changed, 50 insertions, 0 deletions

diff --git a/meta/classes/goarch.bbclass b/meta/classes/goarch.bbclass
new file mode 100644
index 0000000000..4a5b2ec787
--- /dev/null
+++ b/meta/classes/goarch.bbclass
@@ -0,0 +1,50 @@
+BUILD_GOOS = "${@go_map_os(d.getVar('BUILD_OS', True), d)}"
+BUILD_GOARCH = "${@go_map_arch(d.getVar('BUILD_ARCH', True), d)}"
+BUILD_GOTUPLE = "${BUILD_GOOS}_${BUILD_GOARCH}"
+HOST_GOOS = "${@go_map_os(d.getVar('HOST_OS', True), d)}"
+HOST_GOARCH = "${@go_map_arch(d.getVar('HOST_ARCH', True), d)}"
+HOST_GOARM = "${@go_map_arm(d.getVar('HOST_ARCH', True), d.getVar('TUNE_FEATURES', True), d)}"
+HOST_GOTUPLE = "${HOST_GOOS}_${HOST_GOARCH}"
+TARGET_GOOS = "${@go_map_os(d.getVar('TARGET_OS', True), d)}"
+TARGET_GOARCH = "${@go_map_arch(d.getVar('TARGET_ARCH', True), d)}"
+TARGET_GOARM = "${@go_map_arm(d.getVar('TARGET_ARCH', True), d.getVar('TUNE_FEATURES', True), d)}"
+TARGET_GOTUPLE = "${TARGET_GOOS}_${TARGET_GOARCH}"
+GO_BUILD_BINDIR = "${@['bin/${HOST_GOTUPLE}','bin'][d.getVar('BUILD_GOTUPLE',True) == d.getVar('HOST_GOTUPLE',True)]}"
+
+def go_map_arch(a, d):
+    import re
+    if re.match('i.86', a):
+        return '386'
+    elif a == 'x86_64':
+        return 'amd64'
+    elif re.match('arm.*', a):
+        return 'arm'
+    elif re.match('aarch64.*', a):
+        return 'arm64'
+    elif re.match('mips64el*', a):
+        return 'mips64le'
+    elif re.match('mips64*', a):
+        return 'mips64'
+    elif re.match('mipsel*', a):
+        return 'mipsle'
+    elif re.match('mips*', a):
+        return 'mips'
+    elif re.match('p(pc|owerpc)(64)', a):
+        return 'ppc64'
+    elif re.match('p(pc|owerpc)(64el)', a):
+        return 'ppc64le'
+    else:
+        raise bb.parse.SkipPackage("Unsupported CPU architecture: %s" % a)
+
+def go_map_arm(a, f, d):
+    import re
+    if re.match('arm.*', a) and re.match('arm.*7.*', f):
+        return '7'
+    return ''
+
+def go_map_os(o, d):
+    if o.startswith('linux'):
+        return 'linux'
+    return o
+
+