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 {