From: R. Diez <rdiez-2006@rd10.de>
Date: Mon, 2 Dec 2024 16:01:25 +0000 (-0500)
Subject: bootstrap: Disallow use of undefined shell variables, if possible.
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=71afdbc878cff0f085da216cbbfa8c721090b629;p=thirdparty%2Fautoconf.git

bootstrap: Disallow use of undefined shell variables, if possible.
---

diff --git a/bootstrap b/bootstrap
index 700ec25d1..3b7c1db41 100755
--- a/bootstrap
+++ b/bootstrap
@@ -28,6 +28,9 @@
 set -e
 (set -o pipefail 2> /dev/null) && set -o pipefail
 
+# Error on undefined variables.
+(set -u 2> /dev/null) && set -u
+
 # Avoid problems due to various shell wrinkles.
 # We assume we have a shell new enough to implement unset correctly.
 (set -o posix 2> /dev/null) && set -o posix
@@ -109,7 +112,7 @@ fi
 # Override SHELL.  This is required on DJGPP so that Perl's system()
 # uses bash, not COMMAND.COM which doesn't quote arguments properly.
 # It's not used otherwise.
-if test -n "$DJDIR"; then
+if test -n "${DJDIR-}"; then
   BOOTSTRAP_SHELL=/dev/env/DJDIR/bin/bash.exe
 else
   BOOTSTRAP_SHELL=/bin/sh