go: fix some linkshared regression introduced in go 1.20

Since go 1.20 some packages fails to link [1][2]
and only build staticaly with GO_LINKSHARED = ""

[1] https://lists.yoctoproject.org/g/meta-virtualization/topic/97182310
[2] https://github.com/golang/go/issues/58966

Signed-off-by: Jose Quaresma <jose.quaresma@foundries.io>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

2 files changed, 91 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.20.1.inc b/meta/recipes-devtools/go/go-1.20.1.inc
index aa3e2dadf1..ffde7ed732 100644
--- a/meta/recipes-devtools/go/go-1.20.1.inc
+++ b/meta/recipes-devtools/go/go-1.20.1.inc
@@ -14,5 +14,6 @@ SRC_URI += "\
     file://0007-exec.go-do-not-write-linker-flags-into-buildids.patch \
     file://0008-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch \
     file://0009-go-Filter-build-paths-on-staticly-linked-arches.patch \
+    file://0010-cmd-compile-re-compile-instantiated-generic-methods-.patch \
 "
 SRC_URI[main.sha256sum] = "b5c1a3af52c385a6d1c76aed5361cf26459023980d0320de7658bae3915831a2"
diff --git a/meta/recipes-devtools/go/go/0010-cmd-compile-re-compile-instantiated-generic-methods-.patch b/meta/recipes-devtools/go/go/0010-cmd-compile-re-compile-instantiated-generic-methods-.patch
new file mode 100644
index 0000000000..f9ac202421
--- /dev/null
+++ b/meta/recipes-devtools/go/go/0010-cmd-compile-re-compile-instantiated-generic-methods-.patch
@@ -0,0 +1,90 @@
+From 7a3bb16b43efba73674629eae4369f9004e37f22 Mon Sep 17 00:00:00 2001
+From: Cuong Manh Le <cuong.manhle.vn@gmail.com>
+Date: Sat, 18 Mar 2023 00:53:07 +0700
+Subject: [PATCH] cmd/compile: re-compile instantiated generic methods in
+ linkshared mode
+
+For G[T] that was seen and compiled in imported package, it is not added
+to typecheck.Target.Decls, prevent wasting compile time re-creating
+DUPOKS symbols. However, the linker do not support a type symbol
+referencing a method symbol across DSO boundary. That causes unreachable
+sym error when building under -linkshared mode.
+
+To fix it, always re-compile generic methods in linkshared mode.
+
+Fixes #58966
+
+Change-Id: I894b417cfe8234ae1fe809cc975889345df22cef
+Reviewed-on: https://go-review.googlesource.com/c/go/+/477375
+Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
+Reviewed-by: Cherry Mui <cherryyz@google.com>
+Reviewed-by: Matthew Dempsky <mdempsky@google.com>
+TryBot-Result: Gopher Robot <gobot@golang.org>
+
+Upstream-Status: Backport [https://github.com/golang/go/commit/bcd82125f85c7c552493e863fa1bb14e6c444557]
+
+Signed-off-by: Jose Quaresma <jose.quaresma@foundries.io>
+---
+ misc/cgo/testshared/shared_test.go              |  7 ++++++-
+ misc/cgo/testshared/testdata/issue58966/main.go | 15 +++++++++++++++
+ src/cmd/compile/internal/noder/unified.go       |  6 +++++-
+ 3 files changed, 26 insertions(+), 2 deletions(-)
+ create mode 100644 misc/cgo/testshared/testdata/issue58966/main.go
+
+diff --git a/misc/cgo/testshared/shared_test.go b/misc/cgo/testshared/shared_test.go
+index b14fb1cb3a..03da8f9435 100644
+--- a/misc/cgo/testshared/shared_test.go
++++ b/misc/cgo/testshared/shared_test.go
+@@ -1112,8 +1112,13 @@ func TestStd(t *testing.T) {
+ 		t.Skip("skip in short mode")
+ 	}
+ 	t.Parallel()
++	tmpDir := t.TempDir()
+ 	// Use a temporary pkgdir to not interfere with other tests, and not write to GOROOT.
+ 	// Cannot use goCmd as it runs with cloned GOROOT which is incomplete.
+ 	runWithEnv(t, "building std", []string{"GOROOT=" + oldGOROOT},
+-		filepath.Join(oldGOROOT, "bin", "go"), "install", "-buildmode=shared", "-pkgdir="+t.TempDir(), "std")
++		filepath.Join(oldGOROOT, "bin", "go"), "install", "-buildmode=shared", "-pkgdir="+tmpDir, "std")
++
++	// Issue #58966.
++	runWithEnv(t, "testing issue #58966", []string{"GOROOT=" + oldGOROOT},
++		filepath.Join(oldGOROOT, "bin", "go"), "run", "-linkshared", "-pkgdir="+tmpDir, "./issue58966/main.go")
+ }
+diff --git a/misc/cgo/testshared/testdata/issue58966/main.go b/misc/cgo/testshared/testdata/issue58966/main.go
+new file mode 100644
+index 0000000000..2d923c3607
+--- /dev/null
++++ b/misc/cgo/testshared/testdata/issue58966/main.go
+@@ -0,0 +1,15 @@
++// Copyright 2023 The Go Authors. All rights reserved.
++// Use of this source code is governed by a BSD-style
++// license that can be found in the LICENSE file.
++
++package main
++
++import "crypto/elliptic"
++
++var curve elliptic.Curve
++
++func main() {
++	switch curve {
++	case elliptic.P224():
++	}
++}
+diff --git a/src/cmd/compile/internal/noder/unified.go b/src/cmd/compile/internal/noder/unified.go
+index ed97a09302..25136e6aad 100644
+--- a/src/cmd/compile/internal/noder/unified.go
++++ b/src/cmd/compile/internal/noder/unified.go
+@@ -158,7 +158,11 @@ func readBodies(target *ir.Package, duringInlining bool) {
+ 			// Instantiated generic function: add to Decls for typechecking
+ 			// and compilation.
+ 			if fn.OClosure == nil && len(pri.dict.targs) != 0 {
+-				if duringInlining {
++				// cmd/link does not support a type symbol referencing a method symbol
++				// across DSO boundary, so force re-compiling methods on a generic type
++				// even it was seen from imported package in linkshared mode, see #58966.
++				canSkipNonGenericMethod := !(base.Ctxt.Flag_linkshared && ir.IsMethod(fn))
++				if duringInlining && canSkipNonGenericMethod {
+ 					inlDecls = append(inlDecls, fn)
+ 				} else {
+ 					target.Decls = append(target.Decls, fn)