From f5b888868651643370187d5706ab24c9406d6f9d Mon Sep 17 00:00:00 2001
From: Castor215 <132155746+Castor215@users.noreply.github.com>
Date: Sun, 8 Oct 2023 00:00:02 +0100
Subject: [PATCH] externals: allow user to use system fmt (#7052)

---
 CMakeLists.txt            |  1 +
 externals/CMakeLists.txt  | 11 +++++++++--
 src/common/CMakeLists.txt |  2 +-
 src/core/CMakeLists.txt   |  2 +-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cfc5e22b21..bf1fdb1b88 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -98,6 +98,7 @@ option(USE_SYSTEM_SOUNDTOUCH "Use the system SoundTouch (instead of the bundled
 option(USE_SYSTEM_CPP_HTTPLIB "Use the system cpp-httplib (instead of the bundled one)" OFF)
 option(USE_SYSTEM_JSON "Use the system JSON (nlohmann-json3) package (instead of the bundled one)" OFF)
 option(USE_SYSTEM_DYNARMIC "Use the system dynarmic (instead of the bundled one)" OFF)
+option(USE_SYSTEM_FMT "Use the system fmt (instead of the bundled one)" OFF)
 
 if (CITRA_USE_PRECOMPILED_HEADERS)
     message(STATUS "Using Precompiled Headers.")
diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index 37684654bc..53fb777eab 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -68,8 +68,15 @@ target_include_directories(dds-ktx INTERFACE ./dds-ktx)
 
 # fmt and Xbyak need to be added before dynarmic
 # libfmt
-option(FMT_INSTALL "" ON)
-add_subdirectory(fmt EXCLUDE_FROM_ALL)
+if(USE_SYSTEM_FMT)
+    add_library(fmt INTERFACE)
+    find_package(fmt REQUIRED)
+    target_link_libraries(fmt INTERFACE fmt::fmt)
+else()
+    option(FMT_INSTALL "" ON)
+    add_subdirectory(fmt EXCLUDE_FROM_ALL)
+endif()
+
 
 # Xbyak
 if ("x86_64" IN_LIST ARCHITECTURE)
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 73270972a6..e2ee678355 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -173,7 +173,7 @@ endif()
 
 create_target_directory_groups(citra_common)
 
-target_link_libraries(citra_common PUBLIC fmt::fmt library-headers microprofile Boost::boost Boost::serialization Boost::iostreams)
+target_link_libraries(citra_common PUBLIC fmt library-headers microprofile Boost::boost Boost::serialization Boost::iostreams)
 target_link_libraries(citra_common PRIVATE libzstd_static)
 
 if ("x86_64" IN_LIST ARCHITECTURE)
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 8c7acd8cb7..15c532c875 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -479,7 +479,7 @@ create_target_directory_groups(citra_core)
 
 target_link_libraries(citra_core PUBLIC citra_common PRIVATE audio_core network video_core)
 target_link_libraries(citra_core PRIVATE Boost::boost Boost::serialization Boost::iostreams httplib)
-target_link_libraries(citra_core PUBLIC dds-ktx PRIVATE cryptopp fmt::fmt lodepng open_source_archives)
+target_link_libraries(citra_core PUBLIC dds-ktx PRIVATE cryptopp fmt lodepng open_source_archives)
 
 if (ENABLE_WEB_SERVICE)
     target_link_libraries(citra_core PRIVATE web_service)