From 106f7937e6bc223fe5b6d01b60f7dcc3c2cfd434 Mon Sep 17 00:00:00 2001
From: Miuna <miuna.oshino@gmail.com>
Date: Sun, 18 Jun 2023 13:04:50 -0400
Subject: [PATCH] feat: add DPP_USE_PCH CMake option to use precompiled headers
 (off by default)

---
 CMakeLists.txt         | 1 +
 library/CMakeLists.txt | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aabbc42a25..c1798137ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,6 +26,7 @@ option(DPP_BUILD_TEST "Build the test program" ON)
 option(DPP_NO_VCPKG "No VCPKG" OFF)
 option(DPP_CORO "Experimental support for C++20 coroutines" OFF)
 option(DPP_USE_EXTERNAL_JSON "Use an external installation of nlohmann::json" OFF)
+option(DPP_USE_PCH "Use precompiled headers to speed up compilation" OFF)
 
 include(CheckCXXSymbolExists)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 4a8624cab9..310ce0cb9a 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -230,6 +230,15 @@ foreach (fullmodname ${subdirlist})
 		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include/dpp>
 	)
 
+	if (DPP_USE_PCH)
+		target_precompile_headers(${modname} PRIVATE
+			"${CMAKE_CURRENT_SOURCE_DIR}/../include/dpp/cluster.h"
+			"${CMAKE_CURRENT_SOURCE_DIR}/../include/dpp/json.h"
+			"${CMAKE_CURRENT_SOURCE_DIR}/../include/dpp/utility.h"
+			"${CMAKE_CURRENT_SOURCE_DIR}/../include/dpp/restresults.h"
+		)
+	endif()
+
 	if (WIN32 AND NOT MINGW)
 		if (NOT WINDOWS_32_BIT)
 			target_link_libraries(${modname} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../win32/lib/libssl.lib"