From fd3612e4339d10a0e02571a8e43868d569b11a9f Mon Sep 17 00:00:00 2001
From: Austin Clements <austin@google.com>
Date: Wed, 14 Apr 2021 12:37:04 -0400
Subject: [PATCH] internal/buildcfg: enable regabiwrappers by default

For #40724.

Change-Id: I75d6ba2d3e4e2d858eea8053efd0f3fd4439dab7
Reviewed-on: https://go-review.googlesource.com/c/go/+/310172
Trust: Austin Clements <austin@google.com>
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
---
 src/internal/buildcfg/exp.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/internal/buildcfg/exp.go b/src/internal/buildcfg/exp.go
index f4368ccdcf..bf4a8fa977 100644
--- a/src/internal/buildcfg/exp.go
+++ b/src/internal/buildcfg/exp.go
@@ -20,10 +20,14 @@ import (
 // was built with.)
 var Experiment goexperiment.Flags = parseExperiments()
 
+var regabiSupported = GOARCH == "amd64" && (GOOS == "linux" || GOOS == "darwin" || GOOS == "windows")
+
 // experimentBaseline specifies the experiment flags that are enabled by
 // default in the current toolchain. This is, in effect, the "control"
 // configuration and any variation from this is an experiment.
-var experimentBaseline = goexperiment.Flags{}
+var experimentBaseline = goexperiment.Flags{
+	RegabiWrappers: regabiSupported,
+}
 
 // FramePointerEnabled enables the use of platform conventions for
 // saving frame pointers.