From 727e9b8312c7ae011b667152606afc0e04ea197a Mon Sep 17 00:00:00 2001
From: Jan Henke <Jan.Henke@taujhe.de>
Date: Sun, 14 Jun 2020 14:12:02 +0200
Subject: [PATCH] Use system gtest instead of downloading and building it

---
 CMakeLists.txt       |  1 -
 tests/CMakeLists.txt | 30 ++++--------------------------
 2 files changed, 4 insertions(+), 27 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 740cd31..f1bf7a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,6 @@ cmake_minimum_required(VERSION 3.1.3...3.16)
 project(GSL VERSION 3.1.0 LANGUAGES CXX)
 
 include(ExternalProject)
-find_package(Git)
 
 # Use GNUInstallDirs to provide the right locations on all platforms
 include(GNUInstallDirs)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 2bd1bbe..c42afb7 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -5,32 +5,9 @@ project(GSLTests CXX)
 # will make visual studio generated project group files
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
-configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
-execute_process(
-    COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
-    RESULT_VARIABLE result
-    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download
-)
-if(result)
-    message(FATAL_ERROR "CMake step for googletest failed: ${result}")
-endif()
-
-execute_process(
-    COMMAND ${CMAKE_COMMAND} --build .
-    RESULT_VARIABLE result
-    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download
-)
-if(result)
-    message(FATAL_ERROR "CMake step for googletest failed: ${result}")
-endif()
-
 set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
 
-add_subdirectory(
-    ${CMAKE_CURRENT_BINARY_DIR}/googletest-src
-    ${CMAKE_CURRENT_BINARY_DIR}/googletest-build
-    EXCLUDE_FROM_ALL
-)
+find_package(GTest REQUIRED)
 
 if (MSVC AND (GSL_CXX_STANDARD EQUAL 17))
     set(GSL_CPLUSPLUS_OPT -Zc:__cplusplus -permissive-)
@@ -139,7 +116,7 @@ endif(MSVC)
 
 # for tests to find the gtest header
 target_include_directories(gsl_tests_config SYSTEM INTERFACE
-    googletest/googletest/include
+    ${GTest_INCLUDE_DIRS}
 )
 
 set_property(TARGET  PROPERTY FOLDER "GSL_tests")
@@ -149,7 +126,8 @@ function(add_gsl_test name)
     target_link_libraries(${name}
         GSL
         gsl_tests_config
-        gtest_main
+        GTest::GTest
+        GTest::Main
     )
     add_test(
         ${name}
-- 
2.26.2