From 31c82143bfdb1d9bc5e6282f3341fc09a0ab2234 Mon Sep 17 00:00:00 2001
From: Alessandro <alessandro.pezzato@gmail.com>
Date: Mon, 3 Sep 2018 09:53:43 -0400
Subject: GoogleTest: gtest_add_tests() fails if any source file is empty

Fixes #18321
---
 Modules/GoogleTest.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/GoogleTest.cmake b/Modules/GoogleTest.cmake
index 2c9ee11..a5bb863 100644
--- a/Modules/GoogleTest.cmake
+++ b/Modules/GoogleTest.cmake
@@ -308,7 +308,7 @@ function(gtest_add_tests)
       set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${source})
     endif()
     file(READ "${source}" contents)
-    string(REGEX MATCHALL "${gtest_test_type_regex} *\\(([A-Za-z_0-9 ,]+)\\)" found_tests ${contents})
+    string(REGEX MATCHALL "${gtest_test_type_regex} *\\(([A-Za-z_0-9 ,]+)\\)" found_tests "${contents}")
     foreach(hit ${found_tests})
       string(REGEX MATCH "${gtest_test_type_regex}" test_type ${hit})
 
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