From ba702043f006abc4418d51fcdb61f1237329503d Mon Sep 17 00:00:00 2001
From: Castor215 <132155746+Castor215@users.noreply.github.com>
Date: Sat, 18 Nov 2023 23:54:27 +0000
Subject: [PATCH] externals: allow user to use system Catch2 (#7190)

---
 externals/CMakeLists.txt                            | 12 +++++++++---
 externals/cmake-modules/CitraHandleSystemLibs.cmake |  3 +++
 src/tests/CMakeLists.txt                            |  2 +-
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index d150cb640..e9f57b5b5 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -41,9 +41,15 @@ else()
 endif()
 
 # Catch2
-set(CATCH_INSTALL_DOCS OFF CACHE BOOL "")
-set(CATCH_INSTALL_EXTRAS OFF CACHE BOOL "")
-add_subdirectory(catch2)
+add_library(catch2 INTERFACE)
+if(USE_SYSTEM_CATCH2)
+    find_package(Catch2 3.0.0 REQUIRED)
+else()
+    set(CATCH_INSTALL_DOCS OFF CACHE BOOL "")
+    set(CATCH_INSTALL_EXTRAS OFF CACHE BOOL "")
+    add_subdirectory(catch2)
+endif()
+target_link_libraries(catch2 INTERFACE Catch2::Catch2WithMain)
 
 # Crypto++
 if(USE_SYSTEM_CRYPTOPP)
diff --git a/externals/cmake-modules/CitraHandleSystemLibs.cmake b/externals/cmake-modules/CitraHandleSystemLibs.cmake
index 44f156b75..b1bb7ccd9 100644
--- a/externals/cmake-modules/CitraHandleSystemLibs.cmake
+++ b/externals/cmake-modules/CitraHandleSystemLibs.cmake
@@ -25,6 +25,7 @@ option(USE_SYSTEM_LODEPNG "Use the system lodepng (instead of the bundled one)"
 option(USE_SYSTEM_OPENAL "Use the system OpenAL (instead of the bundled one)" OFF)
 option(USE_SYSTEM_VMA "Use the system VulkanMemoryAllocator (instead of the bundled one)" OFF)
 option(USE_SYSTEM_VULKAN_HEADERS "Use the system Vulkan headers (instead of the bundled ones)" OFF)
+option(USE_SYSTEM_CATCH2 "Use the system Catch2 (instead of the bundled one)" OFF)
 
 # Qt and MoltenVK are handled separately
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_SDL2 "Disable system SDL2" OFF "USE_SYSTEM_LIBS" OFF)
@@ -49,6 +50,7 @@ CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_LODEPNG "Disable system lodepng" OFF "USE_
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_OPENAL "Disable system OpenAL" OFF "USE_SYSTEM_LIBS" OFF)
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_VMA "Disable system VulkanMemoryAllocator" OFF "USE_SYSTEM_LIBS" OFF)
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_VULKAN_HEADERS "Disable system Vulkan headers" OFF "USE_SYSTEM_LIBS" OFF)
+CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_CATCH2 "Disable system Catch2" OFF "USE_SYSTEM_LIBS" OFF)
 
 set(LIB_VAR_LIST
     SDL2
@@ -73,6 +75,7 @@ set(LIB_VAR_LIST
     OPENAL
     VMA
     VULKAN_HEADERS
+    CATCH2
     )
 
 # First, check that USE_SYSTEM_XXX is not used with USE_SYSTEM_LIBS
diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index dd6e6942f..459168d45 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -21,7 +21,7 @@ add_executable(tests
 create_target_directory_groups(tests)
 
 target_link_libraries(tests PRIVATE citra_common citra_core video_core audio_core)
-target_link_libraries(tests PRIVATE ${PLATFORM_LIBRARIES} Catch2::Catch2WithMain nihstro-headers Threads::Threads)
+target_link_libraries(tests PRIVATE ${PLATFORM_LIBRARIES} catch2 nihstro-headers Threads::Threads)
 
 add_test(NAME tests COMMAND tests)