go: Add recipes for 1.12 release and make it default

- Refresh patches
- Enable GOCACHE required as of Go 1.12

(From OE-Core rev: f559fd6df2978f9093672794420eada2b7452987)

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

1 files changed, 218 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.12/0002-cmd-go-make-content-based-hash-generation-less-pedan.patch b/meta/recipes-devtools/go/go-1.12/0002-cmd-go-make-content-based-hash-generation-less-pedan.patch
new file mode 100644
index 0000000000..66b8561874
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.12/0002-cmd-go-make-content-based-hash-generation-less-pedan.patch
@@ -0,0 +1,218 @@
+From 47db69e20ed66fb62b01affd83d829654b829893 Mon Sep 17 00:00:00 2001
+From: Matt Madison <matt@madison.systems>
+Date: Mon, 19 Feb 2018 08:50:59 -0800
+Subject: [PATCH] cmd/go: make content-based hash generation less pedantic
+
+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.
+
+Upstream-Status: Inappropriate [OE specific]
+
+Signed-off-by: Matt Madison <matt@madison.systems>
+
+---
+ src/cmd/go/internal/envcmd/env.go |  2 +-
+ src/cmd/go/internal/work/exec.go  | 63 ++++++++++++++++++++++---------
+ 2 files changed, 46 insertions(+), 19 deletions(-)
+
+diff --git a/src/cmd/go/internal/envcmd/env.go b/src/cmd/go/internal/envcmd/env.go
+index cedbfbf..5763a0d 100644
+--- a/src/cmd/go/internal/envcmd/env.go
++++ b/src/cmd/go/internal/envcmd/env.go
+@@ -128,7 +128,7 @@ 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)
+diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
+index 12e1527..e41bfac 100644
+--- a/src/cmd/go/internal/work/exec.go
++++ b/src/cmd/go/internal/work/exec.go
+@@ -174,6 +174,8 @@ func (b *Builder) Do(root *Action) {
+        wg.Wait()
+ }
+ 
++var omitGopath = os.Getenv("GOPATH_OMIT_IN_ACTIONID") != ""
++
+ // buildActionID computes the action ID for a build action.
+ func (b *Builder) buildActionID(a *Action) cache.ActionID {
+        p := a.Package
+@@ -190,7 +192,7 @@ func (b *Builder) buildActionID(a *Action) cache.ActionID {
+        // but it does not hide the exact value of $GOPATH.
+        // Include the full dir in that case.
+        // Assume b.WorkDir is being trimmed properly.
+-       if !p.Goroot && !strings.HasPrefix(p.Dir, b.WorkDir) {
++       if !p.Goroot && !omitGopath && !strings.HasPrefix(p.Dir, b.WorkDir) {
+                fmt.Fprintf(h, "dir %s\n", p.Dir)
+        }
+        fmt.Fprintf(h, "goos %s goarch %s\n", cfg.Goos, cfg.Goarch)
+@@ -201,13 +203,13 @@ func (b *Builder) buildActionID(a *Action) cache.ActionID {
+        }
+        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?
+        }
+@@ -2096,33 +2098,33 @@ 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(os.Getenv("FC"), "gfortran")
++func (b *Builder) fcExe(filtered bool) []string {
++       return b.compilerExe(os.Getenv("FC"), "gfortran", filtered)
+ }
+ 
+ // compilerExe returns the compiler to use given an
+@@ -2131,11 +2133,14 @@ 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
+ }
+ 
+@@ -2285,8 +2290,23 @@ func envList(key, def string) []string {
+        return strings.Fields(v)
+ }
+ 
++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
++}
++
+ // 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 {
+@@ -2304,6 +2324,13 @@ func (b *Builder) CFlags(p *load.Package) (cppflags, cflags, cxxflags, fflags, l
+        if ldflags, err = buildFlags("LDFLAGS", defaults, p.CgoLDFLAGS, checkLinkerFlags); err != nil {
+                return
+        }
++       if filtered {
++               cppflags = filterCompilerFlags(cppflags)
++               cflags = filterCompilerFlags(cflags)
++               cxxflags = filterCompilerFlags(cxxflags)
++               fflags = filterCompilerFlags(fflags)
++               ldflags = filterCompilerFlags(ldflags)
++       }
+ 
+        return
+ }
+@@ -2319,7 +2346,7 @@ var cgoRe = regexp.MustCompile(`[/\\:]`)
+ 
+ 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
+        }
+@@ -2679,7 +2706,7 @@ func (b *Builder) swigIntSize(objdir string) (intsize string, err error) {
+ 
+ // 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
+        }