From 6d1df77b261e48c80f77db81dc2ad166876657a7 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 3 Dec 2025 08:27:02 +0000
Subject: [PATCH 1/3] Initial plan


From e59f91d5d555fb7215fd33f00c2db56a667d8f63 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 3 Dec 2025 08:31:26 +0000
Subject: [PATCH 2/3] Prefer find_package(GTest) over FetchContent, add
 CSR4MPI_FORCE_FETCH_GTEST option

Co-authored-by: deltaeecs <48714525+deltaeecs@users.noreply.github.com>
---
 CMakeLists.txt | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 63fa4a4..273cd2c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,16 +10,29 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 add_subdirectory(src)
 
-include(FetchContent)
+# GTest discovery: prefer system find_package, fallback to FetchContent
+option(CSR4MPI_FORCE_FETCH_GTEST "Force FetchContent for GoogleTest instead of find_package" OFF)
 
-FetchContent_Declare(
-    googletest
-    URL https://github.com/google/googletest/archive/refs/tags/v1.15.2.zip
-)
+if(NOT CSR4MPI_FORCE_FETCH_GTEST)
+    find_package(GTest QUIET)
+endif()
 
-set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+if(GTest_FOUND)
+    message(STATUS "Using system GTest via find_package")
+else()
+    message(STATUS "GTest not found via find_package, using FetchContent")
+    include(FetchContent)
 
-FetchContent_MakeAvailable(googletest)
+    FetchContent_Declare(
+        googletest
+        URL https://github.com/google/googletest/archive/refs/tags/v1.15.2.zip
+        DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+    )
+
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+
+    FetchContent_MakeAvailable(googletest)
+endif()
 
 include(CTest)
 enable_testing()

From 23227fb4b1e16ecd34c80049e05fa7a1e54aee6b Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 3 Dec 2025 08:32:38 +0000
Subject: [PATCH 3/3] Fix code review: check both GTest_FOUND and GTEST_FOUND
 for compatibility

Co-authored-by: deltaeecs <48714525+deltaeecs@users.noreply.github.com>
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 273cd2c..962946d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,7 @@ if(NOT CSR4MPI_FORCE_FETCH_GTEST)
     find_package(GTest QUIET)
 endif()
 
-if(GTest_FOUND)
+if(GTest_FOUND OR GTEST_FOUND)
     message(STATUS "Using system GTest via find_package")
 else()
     message(STATUS "GTest not found via find_package, using FetchContent")