From d28981d48ee8c50fc306a3d3c6ce476add9b1eeb Mon Sep 17 00:00:00 2001
From: Shengjing Zhu <zhsj@debian.org>
Date: Tue, 22 Feb 2022 01:57:23 +0800
Subject: [PATCH] Fix build with gccgo

gccgo changes the mangling scheme
https://github.com/golang/gofrontend/commit/b483d0e0a289ba5fcdbd0388cbc75393367ca870

The change is available in gcc-11, which is the least version that
implements go1.16.

Signed-off-by: Shengjing Zhu <zhsj@debian.org>
---
 ...ess_unsafe_linux.s => subprocess_unsafe.s} |  0
 ...nsafe_linux.go => subprocess_unsafe_gc.go} |  3 ++
 mount/subprocess_unsafe_gccgo.go              | 33 +++++++++++++++++++
 3 files changed, 36 insertions(+)
 rename mount/{subprocess_unsafe_linux.s => subprocess_unsafe.s} (100%)
 rename mount/{subprocess_unsafe_linux.go => subprocess_unsafe_gc.go} (95%)
 create mode 100644 mount/subprocess_unsafe_gccgo.go

diff --git a/mount/subprocess_unsafe_linux.s b/mount/subprocess_unsafe.s
similarity index 100%
rename from mount/subprocess_unsafe_linux.s
rename to mount/subprocess_unsafe.s
diff --git a/mount/subprocess_unsafe_linux.go b/mount/subprocess_unsafe_gc.go
similarity index 95%
rename from mount/subprocess_unsafe_linux.go
rename to mount/subprocess_unsafe_gc.go
index c7cb0c034..695280a6b 100644
--- a/mount/subprocess_unsafe_linux.go
+++ b/mount/subprocess_unsafe_gc.go
@@ -1,3 +1,6 @@
+//go:build linux && gc
+// +build linux,gc
+
 /*
    Copyright The containerd Authors.
 
diff --git a/mount/subprocess_unsafe_gccgo.go b/mount/subprocess_unsafe_gccgo.go
new file mode 100644
index 000000000..72c38e70d
--- /dev/null
+++ b/mount/subprocess_unsafe_gccgo.go
@@ -0,0 +1,33 @@
+//go:build linux && gccgo
+// +build linux,gccgo
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package mount
+
+import (
+	_ "unsafe" // required for go:linkname.
+)
+
+//go:linkname beforeFork syscall.runtime__BeforeFork
+func beforeFork()
+
+//go:linkname afterFork syscall.runtime__AfterFork
+func afterFork()
+
+//go:linkname afterForkInChild syscall.runtime__AfterForkInChild
+func afterForkInChild()