From a5b57bb9cd1500a6e0a3c800b35c1984211dff1d Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Mon, 21 Nov 2022 22:45:11 -0500
Subject: [PATCH] CMake: Add option to use precompiled headers

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ac142d12..cf3e69a5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,7 @@ option(DYNARMIC_IGNORE_ASSERTS "Ignore asserts" OFF)
 option(DYNARMIC_TESTS "Build tests" ${MASTER_PROJECT})
 option(DYNARMIC_TESTS_USE_UNICORN "Enable fuzzing tests against unicorn" OFF)
 option(DYNARMIC_USE_LLVM "Support disassembly of jitted x86_64 code using LLVM" OFF)
+option(DYNARMIC_USE_PRECOMPILED_HEADERS "Use precompiled headers" ON)
 option(DYNARMIC_WARNINGS_AS_ERRORS "Warnings as errors" ${MASTER_PROJECT})
 if (NOT DEFINED DYNARMIC_FRONTENDS)
     set(DYNARMIC_FRONTENDS "A32;A64" CACHE STRING "Selects which frontends to enable")
diff --git a/src/dynarmic/CMakeLists.txt b/src/dynarmic/CMakeLists.txt
index 8ae02cf3..75c24feb 100644
--- a/src/dynarmic/CMakeLists.txt
+++ b/src/dynarmic/CMakeLists.txt
@@ -454,3 +454,12 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
     target_compile_definitions(dynarmic PRIVATE FMT_USE_WINDOWS_H=0)
 endif()
 target_compile_definitions(dynarmic PRIVATE FMT_USE_USER_DEFINED_LITERALS=1)
+
+if (DYNARMIC_USE_PRECOMPILED_HEADERS)
+    set(PRECOMPILED_HEADERS "$<$<COMPILE_LANGUAGE:CXX>:${CMAKE_CURRENT_SOURCE_DIR}/ir/ir_emitter.h>")
+    if (ARCHITECTURE STREQUAL "x86_64")
+        list(PREPEND PRECOMPILED_HEADERS "$<$<COMPILE_LANGUAGE:CXX>:<xbyak/xbyak.h$<ANGLE-R>>")
+    endif()
+    target_precompile_headers(dynarmic PRIVATE ${PRECOMPILED_HEADERS})
+    set(CMAKE_PCH_INSTANTIATE_TEMPLATES ON)
+endif()