go: Upgrade to 1.15 major release

1.15 is latest major release changelog is [1] and detailed blog is [2]

Drop hardcoding ldso patch in favor of setting it using GO_LDSO variable
which can be defined in terms of linuxloader defined by OE

Setting GOBUILDMODE to pie is no longer needed

[1] https://golang.org/doc/go1.15
[2] https://blog.golang.org/go1.15

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

8 files changed, 803 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.15/0001-allow-CC-and-CXX-to-have-multiple-words.patch b/meta/recipes-devtools/go/go-1.15/0001-allow-CC-and-CXX-to-have-multiple-words.patch
new file mode 100644
index 0000000000..5f4823be22
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.15/0001-allow-CC-and-CXX-to-have-multiple-words.patch
@@ -0,0 +1,33 @@
+From 9e3dc44cdfa58d96504d0a789dc82617dd5bef55 Mon Sep 17 00:00:00 2001
+From: Alex Kube <alexander.j.kube@gmail.com>
+Date: Wed, 23 Oct 2019 21:01:13 +0430
+Subject: [PATCH 1/9] cmd/go: Allow CC and CXX to have multiple words
+
+Upstream-Status: Inappropriate [OE specific]
+
+Adapted to Go 1.13 from patches originally submitted to
+the meta/recipes-devtools/go tree by
+Matt Madison <matt@madison.systems>.
+
+Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
+
+---
+ src/cmd/go/internal/envcmd/env.go | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/src/cmd/go/internal/envcmd/env.go
++++ b/src/cmd/go/internal/envcmd/env.go
+@@ -103,11 +103,11 @@ func MkEnv() []cfg.EnvVar {
+ 
+ 	cc := cfg.DefaultCC(cfg.Goos, cfg.Goarch)
+ 	if env := strings.Fields(cfg.Getenv("CC")); len(env) > 0 {
+-		cc = env[0]
++		cc = strings.Join(env, " ")
+ 	}
+ 	cxx := cfg.DefaultCXX(cfg.Goos, cfg.Goarch)
+ 	if env := strings.Fields(cfg.Getenv("CXX")); len(env) > 0 {
+-		cxx = env[0]
++		cxx = strings.Join(env, " ")
+ 	}
+ 	env = append(env, cfg.EnvVar{Name: "AR", Value: envOr("AR", "ar")})
+ 	env = append(env, cfg.EnvVar{Name: "CC", Value: cc})
diff --git a/meta/recipes-devtools/go/go-1.15/0002-cmd-go-make-content-based-hash-generation-less-pedan.patch b/meta/recipes-devtools/go/go-1.15/0002-cmd-go-make-content-based-hash-generation-less-pedan.patch
new file mode 100644
index 0000000000..d0511c0c40
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.15/0002-cmd-go-make-content-based-hash-generation-less-pedan.patch
@@ -0,0 +1,219 @@
+From a13ae484e41139094505d2834437e9262a5315f7 Mon Sep 17 00:00:00 2001
+From: Alex Kube <alexander.j.kube@gmail.com>
+Date: Wed, 23 Oct 2019 21:14:22 +0430
+Subject: [PATCH 2/9] cmd/go: make content-based hash generation less pedantic
+
+Upstream-Status: Inappropriate [OE specific]
+
+Go 1.10's build tool now uses content-based hashes to
+determine when something should be built or re-built.
+This same mechanism is used to maintain a built-artifact
+cache for speeding up builds.
+
+However, the hashes it generates include information that
+doesn't work well with OE, nor with using a shared runtime
+library.
+
+First, it embeds path names to source files, unless
+building within GOROOT.  This prevents the building
+of a package in GOPATH for later staging into GOROOT.
+
+This patch adds support for the environment variable
+GOPATH_OMIT_IN_ACTIONID.  If present, path name
+embedding is disabled.
+
+Second, if cgo is enabled, the build ID for cgo-related
+packages will include the current value of the environment
+variables for invoking the compiler (CC, CXX, FC) and
+any CGO_xxFLAGS variables.  Only if the settings used
+during a compilation exactly match, character for character,
+the values used for compiling runtime/cgo or any other
+cgo-enabled package being imported, will the tool
+decide that the imported package is up-to-date.
+
+This is done to help ensure correctness, but is overly
+simplistic and effectively prevents the reuse of built
+artifacts that use cgo (or shared runtime, which includes
+runtime/cgo).
+
+This patch filters out all compiler flags except those
+beginning with '-m'.  The default behavior can be restored
+by setting the CGO_PEDANTIC environment variable.
+
+Adapted to Go 1.13 from patches originally submitted to
+the meta/recipes-devtools/go tree by
+Matt Madison <matt@madison.systems>.
+
+Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
+---
+ src/cmd/go/internal/envcmd/env.go |  2 +-
+ src/cmd/go/internal/work/exec.go  | 66 ++++++++++++++++++++++---------
+ 2 files changed, 49 insertions(+), 19 deletions(-)
+
+--- a/src/cmd/go/internal/envcmd/env.go
++++ b/src/cmd/go/internal/envcmd/env.go
+@@ -157,7 +157,7 @@ func ExtraEnvVars() []cfg.EnvVar {
+ func ExtraEnvVarsCostly() []cfg.EnvVar {
+ 	var b work.Builder
+ 	b.Init()
+-	cppflags, cflags, cxxflags, fflags, ldflags, err := b.CFlags(&load.Package{})
++	cppflags, cflags, cxxflags, fflags, ldflags, err := b.CFlags(&load.Package{}, false)
+ 	if err != nil {
+ 		// Should not happen - b.CFlags was given an empty package.
+ 		fmt.Fprintf(os.Stderr, "go: invalid cflags: %v\n", err)
+--- a/src/cmd/go/internal/work/exec.go
++++ b/src/cmd/go/internal/work/exec.go
+@@ -33,6 +33,8 @@ import (
+ 	"cmd/go/internal/str"
+ )
+ 
++var omitGopath = os.Getenv("GOPATH_OMIT_IN_ACTIONID") != ""
++
+ // actionList returns the list of actions in the dag rooted at root
+ // as visited in a depth-first post-order traversal.
+ func actionList(root *Action) []*Action {
+@@ -209,7 +211,7 @@ func (b *Builder) buildActionID(a *Actio
+ 	// Assume b.WorkDir is being trimmed properly.
+ 	// When -trimpath is used with a package built from the module cache,
+ 	// use the module path and version instead of the directory.
+-	if !p.Goroot && !cfg.BuildTrimpath && !strings.HasPrefix(p.Dir, b.WorkDir) {
++	if !p.Goroot && !omitGopath && !cfg.BuildTrimpath && !strings.HasPrefix(p.Dir, b.WorkDir) {
+ 		fmt.Fprintf(h, "dir %s\n", p.Dir)
+ 	} else if cfg.BuildTrimpath && p.Module != nil {
+ 		fmt.Fprintf(h, "module %s@%s\n", p.Module.Path, p.Module.Version)
+@@ -228,13 +230,13 @@ func (b *Builder) buildActionID(a *Actio
+ 	}
+ 	if len(p.CgoFiles)+len(p.SwigFiles) > 0 {
+ 		fmt.Fprintf(h, "cgo %q\n", b.toolID("cgo"))
+-		cppflags, cflags, cxxflags, fflags, ldflags, _ := b.CFlags(p)
+-		fmt.Fprintf(h, "CC=%q %q %q %q\n", b.ccExe(), cppflags, cflags, ldflags)
++		cppflags, cflags, cxxflags, fflags, ldflags, _ := b.CFlags(p, true)
++		fmt.Fprintf(h, "CC=%q %q %q %q\n", b.ccExe(true), cppflags, cflags, ldflags)
+ 		if len(p.CXXFiles)+len(p.SwigFiles) > 0 {
+-			fmt.Fprintf(h, "CXX=%q %q\n", b.cxxExe(), cxxflags)
++			fmt.Fprintf(h, "CXX=%q %q\n", b.cxxExe(true), cxxflags)
+ 		}
+ 		if len(p.FFiles) > 0 {
+-			fmt.Fprintf(h, "FC=%q %q\n", b.fcExe(), fflags)
++			fmt.Fprintf(h, "FC=%q %q\n", b.fcExe(true), fflags)
+ 		}
+ 		// TODO(rsc): Should we include the SWIG version or Fortran/GCC/G++/Objective-C compiler versions?
+ 	}
+@@ -2298,33 +2300,48 @@ var (
+ // gccCmd returns a gcc command line prefix
+ // defaultCC is defined in zdefaultcc.go, written by cmd/dist.
+ func (b *Builder) GccCmd(incdir, workdir string) []string {
+-	return b.compilerCmd(b.ccExe(), incdir, workdir)
++	return b.compilerCmd(b.ccExe(false), incdir, workdir)
+ }
+ 
+ // gxxCmd returns a g++ command line prefix
+ // defaultCXX is defined in zdefaultcc.go, written by cmd/dist.
+ func (b *Builder) GxxCmd(incdir, workdir string) []string {
+-	return b.compilerCmd(b.cxxExe(), incdir, workdir)
++	return b.compilerCmd(b.cxxExe(false), incdir, workdir)
+ }
+ 
+ // gfortranCmd returns a gfortran command line prefix.
+ func (b *Builder) gfortranCmd(incdir, workdir string) []string {
+-	return b.compilerCmd(b.fcExe(), incdir, workdir)
++	return b.compilerCmd(b.fcExe(false), incdir, workdir)
+ }
+ 
+ // ccExe returns the CC compiler setting without all the extra flags we add implicitly.
+-func (b *Builder) ccExe() []string {
+-	return b.compilerExe(origCC, cfg.DefaultCC(cfg.Goos, cfg.Goarch))
++func (b *Builder) ccExe(filtered bool) []string {
++	return b.compilerExe(origCC, cfg.DefaultCC(cfg.Goos, cfg.Goarch), filtered)
+ }
+ 
+ // cxxExe returns the CXX compiler setting without all the extra flags we add implicitly.
+-func (b *Builder) cxxExe() []string {
+-	return b.compilerExe(origCXX, cfg.DefaultCXX(cfg.Goos, cfg.Goarch))
++func (b *Builder) cxxExe(filtered bool) []string {
++	return b.compilerExe(origCXX, cfg.DefaultCXX(cfg.Goos, cfg.Goarch), filtered)
+ }
+ 
+ // fcExe returns the FC compiler setting without all the extra flags we add implicitly.
+-func (b *Builder) fcExe() []string {
+-	return b.compilerExe(cfg.Getenv("FC"), "gfortran")
++func (b *Builder) fcExe(filtered bool) []string {
++	return b.compilerExe(os.Getenv("FC"), "gfortran", filtered)
++}
++
++var filterFlags = os.Getenv("CGO_PEDANTIC") == ""
++
++func filterCompilerFlags(flags []string) []string {
++	var newflags []string
++	if !filterFlags {
++		return flags
++	}
++	for _, flag := range flags {
++		if strings.HasPrefix(flag, "-m") {
++			newflags = append(newflags, flag)
++		}
++	}
++	return newflags
+ }
+ 
+ // compilerExe returns the compiler to use given an
+@@ -2333,11 +2350,16 @@ func (b *Builder) fcExe() []string {
+ // of the compiler but can have additional arguments if they
+ // were present in the environment value.
+ // For example if CC="gcc -DGOPHER" then the result is ["gcc", "-DGOPHER"].
+-func (b *Builder) compilerExe(envValue string, def string) []string {
++func (b *Builder) compilerExe(envValue string, def string, filtered bool) []string {
+ 	compiler := strings.Fields(envValue)
+ 	if len(compiler) == 0 {
+ 		compiler = []string{def}
+ 	}
++
++	if filtered {
++		return append(compiler[0:1], filterCompilerFlags(compiler[1:])...)
++	}
++
+ 	return compiler
+ }
+ 
+@@ -2510,7 +2532,7 @@ func envList(key, def string) []string {
+ }
+ 
+ // CFlags returns the flags to use when invoking the C, C++ or Fortran compilers, or cgo.
+-func (b *Builder) CFlags(p *load.Package) (cppflags, cflags, cxxflags, fflags, ldflags []string, err error) {
++func (b *Builder) CFlags(p *load.Package, filtered bool) (cppflags, cflags, cxxflags, fflags, ldflags []string, err error) {
+ 	defaults := "-g -O2"
+ 
+ 	if cppflags, err = buildFlags("CPPFLAGS", "", p.CgoCPPFLAGS, checkCompilerFlags); err != nil {
+@@ -2529,6 +2551,14 @@ func (b *Builder) CFlags(p *load.Package
+ 		return
+ 	}
+ 
++	if filtered {
++		cppflags = filterCompilerFlags(cppflags)
++		cflags = filterCompilerFlags(cflags)
++		cxxflags = filterCompilerFlags(cxxflags)
++		fflags = filterCompilerFlags(fflags)
++		ldflags = filterCompilerFlags(ldflags)
++	}
++
+ 	return
+ }
+ 
+@@ -2543,7 +2573,7 @@ var cgoRe = lazyregexp.New(`[/\\:]`)
+ 
+ func (b *Builder) cgo(a *Action, cgoExe, objdir string, pcCFLAGS, pcLDFLAGS, cgofiles, gccfiles, gxxfiles, mfiles, ffiles []string) (outGo, outObj []string, err error) {
+ 	p := a.Package
+-	cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, cgoFFLAGS, cgoLDFLAGS, err := b.CFlags(p)
++	cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, cgoFFLAGS, cgoLDFLAGS, err := b.CFlags(p, false)
+ 	if err != nil {
+ 		return nil, nil, err
+ 	}
+@@ -2902,7 +2932,7 @@ func (b *Builder) swigIntSize(objdir str
+ 
+ // Run SWIG on one SWIG input file.
+ func (b *Builder) swigOne(a *Action, p *load.Package, file, objdir string, pcCFLAGS []string, cxx bool, intgosize string) (outGo, outC string, err error) {
+-	cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, _, _, err := b.CFlags(p)
++	cgoCPPFLAGS, cgoCFLAGS, cgoCXXFLAGS, _, _, err := b.CFlags(p, false)
+ 	if err != nil {
+ 		return "", "", err
+ 	}
diff --git a/meta/recipes-devtools/go/go-1.15/0003-allow-GOTOOLDIR-to-be-overridden-in-the-environment.patch b/meta/recipes-devtools/go/go-1.15/0003-allow-GOTOOLDIR-to-be-overridden-in-the-environment.patch
new file mode 100644
index 0000000000..662c705471
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.15/0003-allow-GOTOOLDIR-to-be-overridden-in-the-environment.patch
@@ -0,0 +1,47 @@
+From 28ada8896b76d620240bafc22aa395071d601482 Mon Sep 17 00:00:00 2001
+From: Alex Kube <alexander.j.kube@gmail.com>
+Date: Wed, 23 Oct 2019 21:15:37 +0430
+Subject: [PATCH 3/9] cmd/go: Allow GOTOOLDIR to be overridden in the environment
+
+to allow for split host/target build roots
+
+Adapted to Go 1.13 from patches originally submitted to
+the meta/recipes-devtools/go tree by
+Matt Madison <matt@madison.systems>.
+
+Upstream-Status: Inappropriate [OE specific]
+
+Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
+---
+ src/cmd/dist/build.go          | 4 +++-
+ src/cmd/go/internal/cfg/cfg.go | 6 +++++-
+ 2 files changed, 8 insertions(+), 2 deletions(-)
+
+--- a/src/cmd/dist/build.go
++++ b/src/cmd/dist/build.go
+@@ -246,7 +246,9 @@ func xinit() {
+ 	workdir = xworkdir()
+ 	xatexit(rmworkdir)
+ 
+-	tooldir = pathf("%s/pkg/tool/%s_%s", goroot, gohostos, gohostarch)
++	if tooldir = os.Getenv("GOTOOLDIR"); tooldir == "" {
++		tooldir = pathf("%s/pkg/tool/%s_%s", goroot, gohostos, gohostarch)
++	}
+ }
+ 
+ // compilerEnv returns a map from "goos/goarch" to the
+--- a/src/cmd/go/internal/cfg/cfg.go
++++ b/src/cmd/go/internal/cfg/cfg.go
+@@ -64,7 +64,11 @@ func defaultContext() build.Context {
+ 		// variables. This matches the initialization of ToolDir in
+ 		// go/build, except for using ctxt.GOROOT rather than
+ 		// runtime.GOROOT.
+-		build.ToolDir = filepath.Join(ctxt.GOROOT, "pkg/tool/"+runtime.GOOS+"_"+runtime.GOARCH)
++		if s := os.Getenv("GOTOOLDIR"); s != "" {
++			build.ToolDir = filepath.Clean(s)
++		} else {
++			build.ToolDir = filepath.Join(ctxt.GOROOT, "pkg/tool/"+runtime.GOOS+"_"+runtime.GOARCH)
++		}
+ 	}
+ 
+ 	ctxt.GOPATH = envOr("GOPATH", ctxt.GOPATH)
diff --git a/meta/recipes-devtools/go/go-1.15/0004-ld-add-soname-to-shareable-objects.patch b/meta/recipes-devtools/go/go-1.15/0004-ld-add-soname-to-shareable-objects.patch
new file mode 100644
index 0000000000..da29923920
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.15/0004-ld-add-soname-to-shareable-objects.patch
@@ -0,0 +1,45 @@
+From bf5cf5301ae5914498454c87293d1df2e1d8489f Mon Sep 17 00:00:00 2001
+From: Alex Kube <alexander.j.kube@gmail.com>
+Date: Wed, 23 Oct 2019 21:16:32 +0430
+Subject: [PATCH 4/9] ld: add soname to shareable objects
+
+so that OE's shared library dependency handling
+can find them.
+
+Adapted to Go 1.13 from patches originally submitted to
+the meta/recipes-devtools/go tree by
+Matt Madison <matt@madison.systems>.
+
+Upstream-Status: Inappropriate [OE specific]
+
+Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
+---
+ src/cmd/link/internal/ld/lib.go | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/src/cmd/link/internal/ld/lib.go
++++ b/src/cmd/link/internal/ld/lib.go
+@@ -1446,6 +1446,7 @@ func (ctxt *Link) hostlink() {
+ 				argv = append(argv, "-Wl,-z,relro")
+ 			}
+ 			argv = append(argv, "-shared")
++			argv = append(argv, fmt.Sprintf("-Wl,-soname,%s", filepath.Base(*flagOutfile)))
+ 			if ctxt.HeadType != objabi.Hwindows {
+ 				// Pass -z nodelete to mark the shared library as
+ 				// non-closeable: a dlclose will do nothing.
+@@ -1457,6 +1458,7 @@ func (ctxt *Link) hostlink() {
+ 			argv = append(argv, "-Wl,-z,relro")
+ 		}
+ 		argv = append(argv, "-shared")
++		argv = append(argv, fmt.Sprintf("-Wl,-soname,%s", filepath.Base(*flagOutfile)))
+ 	case BuildModePlugin:
+ 		if ctxt.HeadType == objabi.Hdarwin {
+ 			argv = append(argv, "-dynamiclib")
+@@ -1465,6 +1467,7 @@ func (ctxt *Link) hostlink() {
+ 				argv = append(argv, "-Wl,-z,relro")
+ 			}
+ 			argv = append(argv, "-shared")
++			argv = append(argv, fmt.Sprintf("-Wl,-soname,%s", filepath.Base(*flagOutfile)))
+ 		}
+ 	}
+ 
diff --git a/meta/recipes-devtools/go/go-1.15/0005-make.bash-override-CC-when-building-dist-and-go_boot.patch b/meta/recipes-devtools/go/go-1.15/0005-make.bash-override-CC-when-building-dist-and-go_boot.patch
new file mode 100644
index 0000000000..59c12d9546
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.15/0005-make.bash-override-CC-when-building-dist-and-go_boot.patch
@@ -0,0 +1,39 @@
+From f05ef3ded52b98537c10efd0b15cd9612471524d Mon Sep 17 00:00:00 2001
+From: Alex Kube <alexander.j.kube@gmail.com>
+Date: Wed, 23 Oct 2019 21:17:16 +0430
+Subject: [PATCH 5/9] make.bash: override CC when building dist and
+ go_bootstrap
+
+for handling OE cross-canadian builds.
+
+Adapted to Go 1.13 from patches originally submitted to
+the meta/recipes-devtools/go tree by
+Matt Madison <matt@madison.systems>.
+
+Upstream-Status: Inappropriate [OE specific]
+
+Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
+---
+ src/make.bash | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/src/make.bash
++++ b/src/make.bash
+@@ -178,7 +178,7 @@ if [ "$GOROOT_BOOTSTRAP" = "$GOROOT" ];
+ 	exit 1
+ fi
+ rm -f cmd/dist/dist
+-GOROOT="$GOROOT_BOOTSTRAP" GOOS="" GOARCH="" GO111MODULE=off "$GOROOT_BOOTSTRAP/bin/go" build -o cmd/dist/dist ./cmd/dist
++CC="${BUILD_CC:-${CC}}" GOROOT="$GOROOT_BOOTSTRAP" GOOS="" GOARCH="" GO111MODULE=off "$GOROOT_BOOTSTRAP/bin/go" build -o cmd/dist/dist ./cmd/dist
+ 
+ # -e doesn't propagate out of eval, so check success by hand.
+ eval $(./cmd/dist/dist env -p || echo FAIL=true)
+@@ -209,7 +209,7 @@ fi
+ # Run dist bootstrap to complete make.bash.
+ # Bootstrap installs a proper cmd/dist, built with the new toolchain.
+ # Throw ours, built with Go 1.4, away after bootstrap.
+-./cmd/dist/dist bootstrap $buildall $vflag $GO_DISTFLAGS "$@"
++CC="${BUILD_CC:-${CC}}" ./cmd/dist/dist bootstrap $buildall $vflag $GO_DISTFLAGS "$@"
+ rm -f ./cmd/dist/dist
+ 
+ # DO NOT ADD ANY NEW CODE HERE.
diff --git a/meta/recipes-devtools/go/go-1.15/0006-cmd-dist-separate-host-and-target-builds.patch b/meta/recipes-devtools/go/go-1.15/0006-cmd-dist-separate-host-and-target-builds.patch
new file mode 100644
index 0000000000..7aee0bac43
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.15/0006-cmd-dist-separate-host-and-target-builds.patch
@@ -0,0 +1,274 @@
+From 10735bb84df17ba657f76835f483cd8543a879c1 Mon Sep 17 00:00:00 2001
+From: Alex Kube <alexander.j.kube@gmail.com>
+Date: Wed, 23 Oct 2019 21:18:12 +0430
+Subject: [PATCH 6/9] cmd/dist: separate host and target builds
+
+Upstream-Status: Inappropriate [OE specific]
+
+Change the dist tool to allow for OE-style cross-
+and cross-canadian builds:
+
+ - command flags --host-only and --target only are added;
+   if one is present, the other changes mentioned below
+   take effect, and arguments may also be specified on
+   the command line to enumerate the package(s) to be
+   built.
+
+ - for OE cross builds, go_bootstrap is always built for
+   the current build host, and is moved, along with the supporting
+   toolchain (asm, compile, etc.) to a separate 'native_native'
+   directory under GOROOT/pkg/tool.
+
+ - go_bootstrap is not automatically removed after the build,
+   so it can be reused later (e.g., building both static and
+   shared runtime).
+
+Note that for --host-only builds, it would be nice to specify
+just the "cmd" package to build only the go commands/tools,
+the staleness checks in the dist tool will fail if the "std"
+library has not also been built.  So host-only builds have to
+build everything anyway.
+
+Adapted to Go 1.13 from patches originally submitted to
+the meta/recipes-devtools/go tree by
+Matt Madison <matt@madison.systems>.
+
+Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
+---
+ src/cmd/dist/build.go | 155 ++++++++++++++++++++++++++++++------------
+ 1 file changed, 112 insertions(+), 43 deletions(-)
+
+--- a/src/cmd/dist/build.go
++++ b/src/cmd/dist/build.go
+@@ -41,6 +41,7 @@ var (
+ 	goldflags        string
+ 	workdir          string
+ 	tooldir          string
++	build_tooldir    string
+ 	oldgoos          string
+ 	oldgoarch        string
+ 	exe              string
+@@ -53,6 +54,7 @@ var (
+ 
+ 	rebuildall   bool
+ 	defaultclang bool
++	crossBuild   bool
+ 
+ 	vflag int // verbosity
+ )
+@@ -249,6 +251,8 @@ func xinit() {
+ 	if tooldir = os.Getenv("GOTOOLDIR"); tooldir == "" {
+ 		tooldir = pathf("%s/pkg/tool/%s_%s", goroot, gohostos, gohostarch)
+ 	}
++
++	build_tooldir = pathf("%s/pkg/tool/native_native", goroot)
+ }
+ 
+ // compilerEnv returns a map from "goos/goarch" to the
+@@ -480,8 +484,10 @@ func setup() {
+ 	p := pathf("%s/pkg/%s_%s", goroot, gohostos, gohostarch)
+ 	if rebuildall {
+ 		xremoveall(p)
++		xremoveall(build_tooldir)
+ 	}
+ 	xmkdirall(p)
++	xmkdirall(build_tooldir)
+ 
+ 	if goos != gohostos || goarch != gohostarch {
+ 		p := pathf("%s/pkg/%s_%s", goroot, goos, goarch)
+@@ -1244,12 +1250,29 @@ func cmdbootstrap() {
+ 
+ 	var noBanner bool
+ 	var debug bool
++	var hostOnly bool
++	var targetOnly bool
++	var toBuild = []string{"std", "cmd"}
++
+ 	flag.BoolVar(&rebuildall, "a", rebuildall, "rebuild all")
+ 	flag.BoolVar(&debug, "d", debug, "enable debugging of bootstrap process")
+ 	flag.BoolVar(&noBanner, "no-banner", noBanner, "do not print banner")
++	flag.BoolVar(&hostOnly, "host-only", hostOnly, "build only host binaries, not target")
++	flag.BoolVar(&targetOnly, "target-only", targetOnly, "build only target binaries, not host")
+ 
+-	xflagparse(0)
++	xflagparse(-1)
+ 
++	if hostOnly && targetOnly {
++		fatalf("specify only one of --host-only or --target-only\n")
++	}
++	crossBuild = hostOnly || targetOnly
++	if flag.NArg() > 0 {
++		if crossBuild {
++			toBuild = flag.Args()
++		} else {
++			fatalf("package names not permitted without --host-only or --target-only\n")
++		}
++	}
+ 	// Set GOPATH to an internal directory. We shouldn't actually
+ 	// need to store files here, since the toolchain won't
+ 	// depend on modules outside of vendor directories, but if
+@@ -1303,8 +1326,13 @@ func cmdbootstrap() {
+ 		xprintf("\n")
+ 	}
+ 
+-	gogcflags = os.Getenv("GO_GCFLAGS") // we were using $BOOT_GO_GCFLAGS until now
+-	goldflags = os.Getenv("GO_LDFLAGS") // we were using $BOOT_GO_LDFLAGS until now
++	// For split host/target cross/cross-canadian builds, we don't
++	// want to be setting these flags until after we have compiled
++	// the toolchain that runs on the build host.
++	if !crossBuild {
++		gogcflags = os.Getenv("GO_GCFLAGS") // we were using $BOOT_GO_GCFLAGS until now
++		goldflags = os.Getenv("GO_LDFLAGS") // we were using $BOOT_GO_LDFLAGS until now
++	}
+ 	goBootstrap := pathf("%s/go_bootstrap", tooldir)
+ 	cmdGo := pathf("%s/go", gobin)
+ 	if debug {
+@@ -1333,7 +1361,11 @@ func cmdbootstrap() {
+ 		xprintf("\n")
+ 	}
+ 	xprintf("Building Go toolchain2 using go_bootstrap and Go toolchain1.\n")
+-	os.Setenv("CC", compilerEnvLookup(defaultcc, goos, goarch))
++	if crossBuild {
++		os.Setenv("CC", defaultcc[""])
++	} else {
++		os.Setenv("CC", compilerEnvLookup(defaultcc, goos, goarch))
++	}
+ 	goInstall(goBootstrap, append([]string{"-i"}, toolchain...)...)
+ 	if debug {
+ 		run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
+@@ -1370,50 +1402,84 @@ func cmdbootstrap() {
+ 	}
+ 	checkNotStale(goBootstrap, append(toolchain, "runtime/internal/sys")...)
+ 
+-	if goos == oldgoos && goarch == oldgoarch {
+-		// Common case - not setting up for cross-compilation.
+-		timelog("build", "toolchain")
+-		if vflag > 0 {
+-			xprintf("\n")
++	if crossBuild {
++		gogcflags = os.Getenv("GO_GCFLAGS")
++		goldflags = os.Getenv("GO_LDFLAGS")
++		tool_files, _ := filepath.Glob(pathf("%s/*", tooldir))
++		for _, f := range tool_files {
++			copyfile(pathf("%s/%s", build_tooldir, filepath.Base(f)), f, writeExec)
++			xremove(f)
++		}
++		os.Setenv("GOTOOLDIR", build_tooldir)
++		goBootstrap = pathf("%s/go_bootstrap", build_tooldir)
++		if hostOnly {
++			timelog("build", "host toolchain")
++			if vflag > 0 {
++				xprintf("\n")
++			}
++			xprintf("Building %s for host, %s/%s.\n", strings.Join(toBuild, ","), goos, goarch)
++			goInstall(goBootstrap, toBuild...)
++			checkNotStale(goBootstrap, toBuild...)
++			// Skip cmdGo staleness checks here, since we can't necessarily run the cmdGo binary
++
++			timelog("build", "target toolchain")
++			if vflag > 0 {
++				xprintf("\n")
++			}
++		} else if targetOnly {
++			goos = oldgoos
++			goarch = oldgoarch
++			os.Setenv("GOOS", goos)
++			os.Setenv("GOARCH", goarch)
++			os.Setenv("CC", compilerEnvLookup(defaultcc, goos, goarch))
++			xprintf("Building %s for target, %s/%s.\n", strings.Join(toBuild, ","), goos, goarch)
++			goInstall(goBootstrap, toBuild...)
++			checkNotStale(goBootstrap, toBuild...)
++			// Skip cmdGo staleness checks here, since we can't run the target's cmdGo binary
+ 		}
+-		xprintf("Building packages and commands for %s/%s.\n", goos, goarch)
+ 	} else {
+-		// GOOS/GOARCH does not match GOHOSTOS/GOHOSTARCH.
+-		// Finish GOHOSTOS/GOHOSTARCH installation and then
+-		// run GOOS/GOARCH installation.
+-		timelog("build", "host toolchain")
+-		if vflag > 0 {
+-			xprintf("\n")
++
++		if goos == oldgoos && goarch == oldgoarch {
++			// Common case - not setting up for cross-compilation.
++			timelog("build", "toolchain")
++			if vflag > 0 {
++				xprintf("\n")
++			}
++			xprintf("Building packages and commands for %s/%s.\n", goos, goarch)
++		} else {
++			// GOOS/GOARCH does not match GOHOSTOS/GOHOSTARCH.
++			// Finish GOHOSTOS/GOHOSTARCH installation and then
++			// run GOOS/GOARCH installation.
++			timelog("build", "host toolchain")
++			if vflag > 0 {
++				xprintf("\n")
++			}
++			xprintf("Building packages and commands for host, %s/%s.\n", goos, goarch)
++			goInstall(goBootstrap, "std", "cmd")
++			checkNotStale(goBootstrap, "std", "cmd")
++			checkNotStale(cmdGo, "std", "cmd")
++
++			timelog("build", "target toolchain")
++			if vflag > 0 {
++				xprintf("\n")
++			}
++			goos = oldgoos
++			goarch = oldgoarch
++			os.Setenv("GOOS", goos)
++			os.Setenv("GOARCH", goarch)
++			os.Setenv("CC", compilerEnvLookup(defaultcc, goos, goarch))
++			xprintf("Building packages and commands for target, %s/%s.\n", goos, goarch)
+ 		}
+-		xprintf("Building packages and commands for host, %s/%s.\n", goos, goarch)
+ 		goInstall(goBootstrap, "std", "cmd")
+ 		checkNotStale(goBootstrap, "std", "cmd")
+ 		checkNotStale(cmdGo, "std", "cmd")
+ 
+-		timelog("build", "target toolchain")
+-		if vflag > 0 {
+-			xprintf("\n")
+-		}
+-		goos = oldgoos
+-		goarch = oldgoarch
+-		os.Setenv("GOOS", goos)
+-		os.Setenv("GOARCH", goarch)
+-		os.Setenv("CC", compilerEnvLookup(defaultcc, goos, goarch))
+-		xprintf("Building packages and commands for target, %s/%s.\n", goos, goarch)
+-	}
+-	targets := []string{"std", "cmd"}
+-	if goos == "js" && goarch == "wasm" {
+-		// Skip the cmd tools for js/wasm. They're not usable.
+-		targets = targets[:1]
+-	}
+-	goInstall(goBootstrap, targets...)
+-	checkNotStale(goBootstrap, targets...)
+-	checkNotStale(cmdGo, targets...)
+-	if debug {
+-		run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
+-		run("", ShowOutput|CheckExit, pathf("%s/buildid", tooldir), pathf("%s/pkg/%s_%s/runtime/internal/sys.a", goroot, goos, goarch))
+-		checkNotStale(goBootstrap, append(toolchain, "runtime/internal/sys")...)
+-		copyfile(pathf("%s/compile4", tooldir), pathf("%s/compile", tooldir), writeExec)
++		if debug {
++			run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
++			run("", ShowOutput|CheckExit, pathf("%s/buildid", tooldir), pathf("%s/pkg/%s_%s/runtime/internal/sys.a", goroot, goos, goarch))
++			checkNotStale(goBootstrap, append(toolchain, "runtime/internal/sys")...)
++			copyfile(pathf("%s/compile4", tooldir), pathf("%s/compile", tooldir), writeExec)
++		}
+ 	}
+ 
+ 	// Check that there are no new files in $GOROOT/bin other than
+@@ -1430,8 +1496,11 @@ func cmdbootstrap() {
+ 		}
+ 	}
+ 
+-	// Remove go_bootstrap now that we're done.
+-	xremove(pathf("%s/go_bootstrap", tooldir))
++	// Except that for split host/target cross-builds, we need to
++	// keep it.
++	if !crossBuild {
++		xremove(pathf("%s/go_bootstrap", tooldir))
++	}
+ 
+ 	if goos == "android" {
+ 		// Make sure the exec wrapper will sync a fresh $GOROOT to the device.
diff --git a/meta/recipes-devtools/go/go-1.15/0007-cmd-go-make-GOROOT-precious-by-default.patch b/meta/recipes-devtools/go/go-1.15/0007-cmd-go-make-GOROOT-precious-by-default.patch
new file mode 100644
index 0000000000..4b4d0d4f3d
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.15/0007-cmd-go-make-GOROOT-precious-by-default.patch
@@ -0,0 +1,104 @@
+From 9ba507e076c744f4d394418e4a849e68cd426a4a Mon Sep 17 00:00:00 2001
+From: Alex Kube <alexander.j.kube@gmail.com>
+Date: Wed, 23 Oct 2019 21:18:56 +0430
+Subject: [PATCH 7/9] cmd/go: make GOROOT precious by default
+
+Upstream-Status: Inappropriate [OE specific]
+
+The go build tool normally rebuilds whatever it detects is
+stale.  This can be a problem when GOROOT is intended to
+be read-only and the go runtime has been built as a shared
+library, since we don't want every application to be rebuilding
+the shared runtime - particularly in cross-build/packaging
+setups, since that would lead to 'abi mismatch' runtime errors.
+
+This patch prevents the install and linkshared actions from
+installing to GOROOT unless overridden with the GOROOT_OVERRIDE
+environment variable.
+
+Adapted to Go 1.13 from patches originally submitted to
+the meta/recipes-devtools/go tree by
+Matt Madison <matt@madison.systems>.
+
+Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
+---
+ src/cmd/go/internal/work/action.go |  3 +++
+ src/cmd/go/internal/work/build.go  |  6 ++++++
+ src/cmd/go/internal/work/exec.go   | 25 +++++++++++++++++++++++++
+ 3 files changed, 34 insertions(+)
+
+--- a/src/cmd/go/internal/work/action.go
++++ b/src/cmd/go/internal/work/action.go
+@@ -670,6 +670,9 @@ func (b *Builder) addTransitiveLinkDeps(
+ 			if p1 == nil || p1.Shlib == "" || haveShlib[filepath.Base(p1.Shlib)] {
+ 				continue
+ 			}
++			if goRootPrecious && (p1.Standard || p1.Goroot) {
++				continue
++			}
+ 			haveShlib[filepath.Base(p1.Shlib)] = true
+ 			// TODO(rsc): The use of ModeInstall here is suspect, but if we only do ModeBuild,
+ 			// we'll end up building an overall library or executable that depends at runtime
+--- a/src/cmd/go/internal/work/build.go
++++ b/src/cmd/go/internal/work/build.go
+@@ -167,6 +167,8 @@ See also: go install, go get, go clean.
+ 
+ const concurrentGCBackendCompilationEnabledByDefault = true
+ 
++var goRootPrecious bool = true
++
+ func init() {
+ 	// break init cycle
+ 	CmdBuild.Run = runBuild
+@@ -179,6 +181,10 @@ func init() {
+ 
+ 	AddBuildFlags(CmdBuild, DefaultBuildFlags)
+ 	AddBuildFlags(CmdInstall, DefaultBuildFlags)
++
++	if x := os.Getenv("GOROOT_OVERRIDE"); x != "" {
++		goRootPrecious = false
++	}
+ }
+ 
+ // Note that flags consulted by other parts of the code
+--- a/src/cmd/go/internal/work/exec.go
++++ b/src/cmd/go/internal/work/exec.go
+@@ -468,6 +468,23 @@ func (b *Builder) build(a *Action) (err
+ 		return errors.New("binary-only packages are no longer supported")
+ 	}
+ 
++	if goRootPrecious && (a.Package.Standard || a.Package.Goroot) {
++		_, err := os.Stat(a.Package.Target)
++		if err == nil {
++			a.built = a.Package.Target
++			a.Target = a.Package.Target
++			a.buildID = b.fileHash(a.Package.Target)
++			a.Package.Stale = false
++			a.Package.StaleReason = "GOROOT-resident package"
++			return nil
++		}
++		a.Package.Stale = true
++		a.Package.StaleReason = "missing or invalid GOROOT-resident package"
++		if b.IsCmdList {
++			return nil
++		}
++	}
++
+ 	if err := b.Mkdir(a.Objdir); err != nil {
+ 		return err
+ 	}
+@@ -1520,6 +1537,14 @@ func BuildInstallFunc(b *Builder, a *Act
+ 		return err
+ 	}
+ 
++	if goRootPrecious && a.Package != nil {
++		p := a.Package
++		if p.Standard || p.Goroot {
++			err := fmt.Errorf("attempting to install package %s into read-only GOROOT", p.ImportPath)
++			return err
++		}
++	}
++
+ 	if err := b.Mkdir(a.Objdir); err != nil {
+ 		return err
+ 	}
diff --git a/meta/recipes-devtools/go/go-1.15/0008-use-GOBUILDMODE-to-set-buildmode.patch b/meta/recipes-devtools/go/go-1.15/0008-use-GOBUILDMODE-to-set-buildmode.patch
new file mode 100644
index 0000000000..4e5d5021d6
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.15/0008-use-GOBUILDMODE-to-set-buildmode.patch
@@ -0,0 +1,42 @@
+From 971b5626339ce0c4d57f9721c9a81af566c5a044 Mon Sep 17 00:00:00 2001
+From: Alex Kube <alexander.j.kube@gmail.com>
+Date: Wed, 23 Oct 2019 21:19:26 +0430
+Subject: [PATCH 8/9] cmd/go: Use GOBUILDMODE to set buildmode
+
+Upstream-Status: Denied [upstream choose antoher solution: `17a256b
+cmd/go: -buildmode=pie for android/arm']
+
+While building go itself, the go build system does not support
+to set `-buildmode=pie' from environment.
+
+Add GOBUILDMODE to support it which make PIE executables the default
+build mode, as PIE executables are required as of Yocto
+
+Refers: https://groups.google.com/forum/#!topic/golang-dev/gRCe5URKewI
+
+Adapted to Go 1.13 from patches originally submitted to
+the meta/recipes-devtools/go tree by
+Hongxu Jia <hongxu.jia@windriver.com>
+
+Signed-off-by: Alexander J Kube <alexander.j.kube@gmail.com>
+---
+ src/cmd/go/internal/work/build.go | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+--- a/src/cmd/go/internal/work/build.go
++++ b/src/cmd/go/internal/work/build.go
+@@ -254,7 +254,13 @@ func AddBuildFlags(cmd *base.Command, ma
+ 
+ 	cmd.Flag.Var(&load.BuildAsmflags, "asmflags", "")
+ 	cmd.Flag.Var(buildCompiler{}, "compiler", "")
+-	cmd.Flag.StringVar(&cfg.BuildBuildmode, "buildmode", "default", "")
++
++	if bm := os.Getenv("GOBUILDMODE"); bm != "" {
++		cmd.Flag.StringVar(&cfg.BuildBuildmode, "buildmode", bm, "")
++	} else {
++		cmd.Flag.StringVar(&cfg.BuildBuildmode, "buildmode", "default", "")
++	}
++
+ 	cmd.Flag.Var(&load.BuildGcflags, "gcflags", "")
+ 	cmd.Flag.Var(&load.BuildGccgoflags, "gccgoflags", "")
+ 	if mask&OmitModFlag == 0 {