From 303628bb0579f13d3ceac915b3caaf4d7fc9b2db Mon Sep 17 00:00:00 2001
From: Sefa Eyeoglu <contact@scrumplex.net>
Date: Sat, 15 Oct 2022 13:13:34 +0200
Subject: [PATCH] refactor: support system ghc-filesystem

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>
---
 CMakeLists.txt          | 17 ++++++++++++-----
 launcher/CMakeLists.txt |  2 +-
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 45dd691db..310cec594 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -189,13 +189,13 @@ if (Qt5_POSITION_INDEPENDENT_CODE)
     SET(CMAKE_POSITION_INDEPENDENT_CODE ON)
 endif()
 
-# Find toml++
 if(NOT Launcher_FORCE_BUNDLED_LIBS)
+    # Find toml++
     find_package(tomlplusplus 3.2.0 QUIET)
-endif()
 
-# Workaround ghc::filesystem bug
-set(GHC_FILESYSTEM_WITH_INSTALL OFF)
+    # Find ghc_filesystem
+    find_package(ghc_filesystem QUIET)
+endif()
 
 ####################################### Program Info #######################################
 
@@ -326,7 +326,14 @@ endif()
 add_subdirectory(libraries/katabasis) # An OAuth2 library that tried to do too much
 add_subdirectory(libraries/gamemode)
 add_subdirectory(libraries/murmur2) # Hash for usage with the CurseForge API
-add_subdirectory(libraries/filesystem) # Implementation of std::filesystem for old C++, for usage in old macOS
+if (NOT ghc_filesystem_FOUND)
+    message(STATUS "Using bundled ghc_filesystem")
+    set(GHC_FILESYSTEM_WITH_INSTALL OFF) # Workaround ghc::filesystem bug
+    add_subdirectory(libraries/filesystem) # Implementation of std::filesystem for old C++, for usage in old macOS
+    add_library(ghcFilesystem::ghc_filesystem ALIAS ghc_filesystem)
+else()
+    message(STATUS "Using system ghc_filesystem")
+endif()
 
 ############################### Built Artifacts ###############################
 
diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index d04f3e4da..c7d0d68cb 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -976,7 +976,7 @@ target_link_libraries(Launcher_logic
     BuildConfig
     Katabasis
     Qt${QT_VERSION_MAJOR}::Widgets
-    ghc_filesystem
+    ghcFilesystem::ghc_filesystem
 )
 
 if (UNIX AND NOT CYGWIN AND NOT APPLE)