From 72f959807d5723c77576e52b1c2b33c28b55f246 Mon Sep 17 00:00:00 2001
From: Andrea Pappacoda <andrea@pappacoda.it>
Date: Sun, 19 Sep 2021 17:17:02 +0200
Subject: [PATCH] build(cmake): use system GTest when available

This speeds up compilation times and makes downstream packaging easier.
---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1b18c9d..b541bca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,6 +31,10 @@ if(NOT COMMAND add_sanitizers)
 endif()
 
 if(BUILD_TESTS)
+  find_package(GTest QUIET)
+  if(TARGET GTest::Main)
+    add_library(gtest_main ALIAS GTest::Main)
+  endif()
   if(NOT TARGET gtest_main)
     if(NOT EXISTS "${PROJECT_SOURCE_DIR}/googletest/CMakeLists.txt")
       message(FATAL_ERROR "Could not find googletest: run\n\tgit submodule update --init --recursive\nin base git checkout")