From 0eb40e10a25570ba34a9ff8116c39c86a97474a2 Mon Sep 17 00:00:00 2001
From: Anmol Sethi <hi@nhooyr.io>
Date: Mon, 7 Sep 2020 10:32:22 -0400
Subject: [PATCH] Make emsdk_env.sh work under set -o nounset (#605)

Closes emscripten-core/emscripten#6743
---
 emsdk_env.sh | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/emsdk_env.sh b/emsdk_env.sh
index 7341255..8f76de7 100644
--- a/emsdk_env.sh
+++ b/emsdk_env.sh
@@ -31,15 +31,15 @@ DIR="."
 # To add a shell, add another conditional below,
 # then add tests to scripts/test_source_env.sh
 
-if [ -n "$BASH_SOURCE" ]; then
+if [ -n "${BASH_SOURCE-}" ]; then
   CURRENT_SCRIPT="$BASH_SOURCE"
-elif [ -n "$ZSH_VERSION" ]; then
+elif [ -n "${ZSH_VERSION-}" ]; then
   CURRENT_SCRIPT="${(%):-%x}"
-elif [ -n "$KSH_VERSION" ]; then
+elif [ -n "${KSH_VERSION-}" ]; then
   CURRENT_SCRIPT=${.sh.file}
 fi
 
-if [ -n "$CURRENT_SCRIPT" ]; then
+if [ -n "${CURRENT_SCRIPT-}" ]; then
   DIR=$(dirname "$CURRENT_SCRIPT")
   if [ -h "$CURRENT_SCRIPT" ]; then
     # Now work out actual DIR since this is part of a symlink.