From a763084ed2e19653952764c1ed0da0329bd94a89 Mon Sep 17 00:00:00 2001
From: Richard Miller <millerresearch@gmail.com>
Date: Thu, 14 Nov 2024 16:00:22 +0000
Subject: [PATCH] make.rc: correct test for undefined GOROOT_BOOTSTRAP

The test "if(! ~ $#GOROOT_BOOTSTRAP 1)", to check for the environment
variable GOROOT_BOOTSTRAP being undefined, will not succeed if the
variable is set to the empty string (as the coordinator was doing).
A better test is "if(~ $"GOROOT_BOOTSTRAP '')", which succeeds if
the variable is undefined, or set to an empty list or an empty string.

For #69038

Change-Id: Ic6e6944e0c76461daea206ba9575b863f92f6228
Reviewed-on: https://go-review.googlesource.com/c/go/+/627944
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David du Colombier <0intro@gmail.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
---
 src/make.rc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/make.rc b/src/make.rc
index cfb9fa0aeb..b3beb75660 100755
--- a/src/make.rc
+++ b/src/make.rc
@@ -51,7 +51,7 @@ fn bootstrapenv {
 bootgo = 1.22.6
 GOROOT = `{cd .. && pwd}
 goroot_bootstrap_set = 'true'
-if(! ~ $#GOROOT_BOOTSTRAP 1){
+if(~ $"GOROOT_BOOTSTRAP ''){
 	goroot_bootstrap_set = 'false'
 	GOROOT_BOOTSTRAP = $home/go1.4
 	for(d in sdk/go$bootgo go$bootgo)
-- 
2.48.1