From 0356b81525019e054be5b6edc0c0f7ca51249f54 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 19 Oct 2020 11:08:49 -0400
Subject: find_package: Fix regression in searching root prefix

Fix the check added by commit 2ff1693066 (find_package: avoid showing
files as directories when searching config files, 2020-09-30,
v3.19.0-rc1~67^2) to avoid skipping the root prefix `/`.

Fixes: #21324
---
 Source/cmFindPackageCommand.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Source/cmFindPackageCommand.cxx b/Source/cmFindPackageCommand.cxx
index c988b59..92b1e80 100644
--- a/Source/cmFindPackageCommand.cxx
+++ b/Source/cmFindPackageCommand.cxx
@@ -1984,7 +1984,7 @@ cmFileListGeneratorBase* cmFileListGeneratorBase::SetNext(
 bool cmFileListGeneratorBase::Consider(std::string const& fullPath,
                                        cmFileList& listing)
 {
-  if (!cmSystemTools::FileIsDirectory(fullPath)) {
+  if (!fullPath.empty() && !cmSystemTools::FileIsDirectory(fullPath)) {
     return false;
   }
   if (this->Next) {
-- 
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