[PATCH 5/6] go: additional patches to help reproducibility

[Alexander Kanavin <alex.kanavin@gmail.com>]

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
---
 meta/recipes-devtools/go/go-1.17.5.inc        |  2 +
 ...not-write-linker-flags-into-buildids.patch | 41 +++++++++++++++++++
 ...ldgo.go-do-not-hardcode-host-compile.patch | 41 +++++++++++++++++++
 3 files changed, 84 insertions(+)
 create mode 100644 meta/recipes-devtools/go/go-1.17/0001-exec.go-do-not-write-linker-flags-into-buildids.patch
 create mode 100644 meta/recipes-devtools/go/go-1.17/0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch

diff --git a/meta/recipes-devtools/go/go-1.17.5.inc b/meta/recipes-devtools/go/go-1.17.5.inc
index baddd3b215..56957f7c6e 100644
--- a/meta/recipes-devtools/go/go-1.17.5.inc
+++ b/meta/recipes-devtools/go/go-1.17.5.inc
@@ -14,6 +14,8 @@ SRC_URI += "\
     file://0007-cmd-go-make-GOROOT-precious-by-default.patch \
     file://0008-use-GOBUILDMODE-to-set-buildmode.patch \
     file://0009-Revert-cmd-go-make-sure-CC-and-CXX-are-absolute.patch \
+    file://0001-exec.go-do-not-write-linker-flags-into-buildids.patch \
+    file://0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch \
 "
 SRC_URI[main.sha256sum] = "3defb9a09bed042403195e872dcbc8c6fae1485963332279668ec52e80a95a2d"
 
diff --git a/meta/recipes-devtools/go/go-1.17/0001-exec.go-do-not-write-linker-flags-into-buildids.patch b/meta/recipes-devtools/go/go-1.17/0001-exec.go-do-not-write-linker-flags-into-buildids.patch
new file mode 100644
index 0000000000..20b6636f65
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.17/0001-exec.go-do-not-write-linker-flags-into-buildids.patch
@@ -0,0 +1,41 @@
+From bdd69b55387f80c8df18d0af5008bf5e1a66be6a Mon Sep 17 00:00:00 2001
+From: Alexander Kanavin <alex.kanavin@gmail.com>
+Date: Mon, 23 Nov 2020 19:22:04 +0000
+Subject: [PATCH] exec.go: do not write linker flags into buildids
+
+The flags can contain build-specific paths, breaking reproducibility.
+
+To make this acceptable to upstream, we probably need to trim the flags,
+removing those known to be buildhost-specific.
+
+Upstream-Status: Inappropriate [needs upstream discussion]
+Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
+---
+ src/cmd/go/internal/work/exec.go | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
+index 696db23..727d40b 100644
+--- a/src/cmd/go/internal/work/exec.go
++++ b/src/cmd/go/internal/work/exec.go
+@@ -1136,7 +1136,7 @@ func (b *Builder) linkActionID(a *Action) cache.ActionID {
+ 	}
+ 
+ 	// Toolchain-dependent configuration, shared with b.linkSharedActionID.
+-	b.printLinkerConfig(h, p)
++	//b.printLinkerConfig(h, p)
+ 
+ 	// Input files.
+ 	for _, a1 := range a.Deps {
+@@ -1418,7 +1418,7 @@ func (b *Builder) linkSharedActionID(a *Action) cache.ActionID {
+ 	fmt.Fprintf(h, "goos %s goarch %s\n", cfg.Goos, cfg.Goarch)
+ 
+ 	// Toolchain-dependent configuration, shared with b.linkActionID.
+-	b.printLinkerConfig(h, nil)
++	//b.printLinkerConfig(h, nil)
+ 
+ 	// Input files.
+ 	for _, a1 := range a.Deps {
+-- 
+2.17.1
+
diff --git a/meta/recipes-devtools/go/go-1.17/0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch b/meta/recipes-devtools/go/go-1.17/0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch
new file mode 100644
index 0000000000..257454a67d
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.17/0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch
@@ -0,0 +1,41 @@
+From 2055a46b396e272616c0b2273903e02c3b49a2ff Mon Sep 17 00:00:00 2001
+From: Alexander Kanavin <alex.kanavin@gmail.com>
+Date: Tue, 10 Nov 2020 16:33:27 +0000
+Subject: [PATCH] src/cmd/dist/buildgo.go: do not hardcode host compilers into
+ target binaries
+
+These come from $CC/$CXX on the build host and are not useful on targets;
+additionally as they contain host specific paths, this helps reproducibility.
+
+Upstream-Status: Inappropriate [needs upstream discussion]
+Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
+---
+ src/cmd/dist/buildgo.go | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/src/cmd/dist/buildgo.go b/src/cmd/dist/buildgo.go
+index caafc13..4eb1c96 100644
+--- a/src/cmd/dist/buildgo.go
++++ b/src/cmd/dist/buildgo.go
+@@ -34,8 +34,8 @@ func mkzdefaultcc(dir, file string) {
+ 		fmt.Fprintf(&buf, "package cfg\n")
+ 		fmt.Fprintln(&buf)
+ 		fmt.Fprintf(&buf, "const DefaultPkgConfig = `%s`\n", defaultpkgconfig)
+-		buf.WriteString(defaultCCFunc("DefaultCC", defaultcc))
+-		buf.WriteString(defaultCCFunc("DefaultCXX", defaultcxx))
++		buf.WriteString(defaultCCFunc("DefaultCC", map[string]string{"":"gcc"}))
++		buf.WriteString(defaultCCFunc("DefaultCXX", map[string]string{"":"g++"}))
+ 		writefile(buf.String(), file, writeSkipSame)
+ 		return
+ 	}
+@@ -46,8 +46,8 @@ func mkzdefaultcc(dir, file string) {
+ 	fmt.Fprintf(&buf, "package main\n")
+ 	fmt.Fprintln(&buf)
+ 	fmt.Fprintf(&buf, "const defaultPkgConfig = `%s`\n", defaultpkgconfig)
+-	buf.WriteString(defaultCCFunc("defaultCC", defaultcc))
+-	buf.WriteString(defaultCCFunc("defaultCXX", defaultcxx))
++	buf.WriteString(defaultCCFunc("defaultCC", map[string]string{"":"gcc"}))
++	buf.WriteString(defaultCCFunc("defaultCXX", map[string]string{"":"g++"}))
+ 	writefile(buf.String(), file, writeSkipSame)
+ }
+ 
-- 
2.20.1