From 2a6f4d879ca79158b92aa84ca63137b86ed4704d Mon Sep 17 00:00:00 2001
From: "Admiral H. Curtiss" <pikachu025@gmail.com>
Date: Wed, 28 Jun 2023 19:44:01 +0200
Subject: [PATCH] CMake: Generate scmrev.h at build time instead of configure
 time.

---
 CMake/ScmRevGen.cmake             | 53 +++++++++++++++++++++
 CMakeLists.txt                    | 77 +++++++------------------------
 Source/Core/Common/CMakeLists.txt |  2 +
 3 files changed, 71 insertions(+), 61 deletions(-)
 create mode 100644 CMake/ScmRevGen.cmake

diff --git a/CMake/ScmRevGen.cmake b/CMake/ScmRevGen.cmake
new file mode 100644
index 0000000000..aacf7491ce
--- /dev/null
+++ b/CMake/ScmRevGen.cmake
@@ -0,0 +1,53 @@
+cmake_minimum_required(VERSION 3.13)
+
+# for revision info
+if(GIT_FOUND)
+  # defines DOLPHIN_WC_REVISION
+  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} rev-parse HEAD
+      OUTPUT_VARIABLE DOLPHIN_WC_REVISION
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+  # defines DOLPHIN_WC_DESCRIBE
+  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} describe --always --long --dirty
+      OUTPUT_VARIABLE DOLPHIN_WC_DESCRIBE
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+  # remove hash (and trailing "-0" if needed) from description
+  string(REGEX REPLACE "(-0)?-[^-]+((-dirty)?)$" "\\2" DOLPHIN_WC_DESCRIBE "${DOLPHIN_WC_DESCRIBE}")
+
+  # defines DOLPHIN_WC_BRANCH
+  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref HEAD
+      OUTPUT_VARIABLE DOLPHIN_WC_BRANCH
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
+
+# version number
+set(DOLPHIN_VERSION_MAJOR "5")
+set(DOLPHIN_VERSION_MINOR "0")
+if(DOLPHIN_WC_BRANCH STREQUAL "stable")
+  set(DOLPHIN_VERSION_PATCH "0")
+else()
+  set(DOLPHIN_VERSION_PATCH ${DOLPHIN_WC_REVISION})
+endif()
+
+# If Dolphin is not built from a Git repository, default the version info to
+# reasonable values.
+if(NOT DOLPHIN_WC_REVISION)
+  set(DOLPHIN_WC_DESCRIBE "${DOLPHIN_VERSION_MAJOR}.${DOLPHIN_VERSION_MINOR}")
+  set(DOLPHIN_WC_REVISION "${DOLPHIN_WC_DESCRIBE} (no further info)")
+  set(DOLPHIN_WC_BRANCH "master")
+endif()
+
+if(DOLPHIN_WC_BRANCH STREQUAL "master" OR DOLPHIN_WC_BRANCH STREQUAL "stable")
+  set(DOLPHIN_WC_IS_STABLE "1")
+else()
+  set(DOLPHIN_WC_IS_STABLE "0")
+endif()
+
+configure_file(
+  "${PROJECT_SOURCE_DIR}/Source/Core/Common/scmrev.h.in"
+  "${PROJECT_BINARY_DIR}/Source/Core/Common/scmrev.h.tmp"
+)
+
+execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${PROJECT_BINARY_DIR}/Source/Core/Common/scmrev.h.tmp" "${PROJECT_BINARY_DIR}/Source/Core/Common/scmrev.h")
+
+file(REMOVE "${PROJECT_BINARY_DIR}/Source/Core/Common/scmrev.h.tmp")
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b9b324fc6..96cd381b3a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -196,59 +196,6 @@ endif()
 # setup CCache
 include(CCache)
 
-# for revision info
-find_package(Git)
-if(GIT_FOUND)
-  # make sure version information gets re-run when the current Git HEAD changes
-  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} rev-parse --git-path HEAD
-      OUTPUT_VARIABLE dolphin_git_head_filename
-      OUTPUT_STRIP_TRAILING_WHITESPACE)
-  set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS "${dolphin_git_head_filename}")
-
-  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} rev-parse --symbolic-full-name HEAD
-      OUTPUT_VARIABLE dolphin_git_head_symbolic
-      OUTPUT_STRIP_TRAILING_WHITESPACE)
-  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-      COMMAND ${GIT_EXECUTABLE} rev-parse --git-path ${dolphin_git_head_symbolic}
-      OUTPUT_VARIABLE dolphin_git_head_symbolic_filename
-      OUTPUT_STRIP_TRAILING_WHITESPACE)
-  set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS "${dolphin_git_head_symbolic_filename}")
-
-  # defines DOLPHIN_WC_REVISION
-  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} rev-parse HEAD
-      OUTPUT_VARIABLE DOLPHIN_WC_REVISION
-      OUTPUT_STRIP_TRAILING_WHITESPACE)
-  # defines DOLPHIN_WC_DESCRIBE
-  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} describe --always --long --dirty
-      OUTPUT_VARIABLE DOLPHIN_WC_DESCRIBE
-      OUTPUT_STRIP_TRAILING_WHITESPACE)
-
-  # remove hash (and trailing "-0" if needed) from description
-  string(REGEX REPLACE "(-0)?-[^-]+((-dirty)?)$" "\\2" DOLPHIN_WC_DESCRIBE "${DOLPHIN_WC_DESCRIBE}")
-
-  # defines DOLPHIN_WC_BRANCH
-  execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref HEAD
-      OUTPUT_VARIABLE DOLPHIN_WC_BRANCH
-      OUTPUT_STRIP_TRAILING_WHITESPACE)
-endif()
-
-# version number
-set(DOLPHIN_VERSION_MAJOR "5")
-set(DOLPHIN_VERSION_MINOR "0")
-if(DOLPHIN_WC_BRANCH STREQUAL "stable")
-  set(DOLPHIN_VERSION_PATCH "0")
-else()
-  set(DOLPHIN_VERSION_PATCH ${DOLPHIN_WC_REVISION})
-endif()
-
-# If Dolphin is not built from a Git repository, default the version info to
-# reasonable values.
-if(NOT DOLPHIN_WC_REVISION)
-  set(DOLPHIN_WC_DESCRIBE "${DOLPHIN_VERSION_MAJOR}.${DOLPHIN_VERSION_MINOR}")
-  set(DOLPHIN_WC_REVISION "${DOLPHIN_WC_DESCRIBE} (no further info)")
-  set(DOLPHIN_WC_BRANCH "master")
-endif()
-
 # Architecture detection and arch specific settings
 message(STATUS "Detected architecture: ${CMAKE_SYSTEM_PROCESSOR}")
 
@@ -1012,20 +959,28 @@ endif()
 ########################################
 # Pre-build events: Define configuration variables and write SCM info header
 #
-if(DOLPHIN_WC_BRANCH STREQUAL "master" OR DOLPHIN_WC_BRANCH STREQUAL "stable")
-  set(DOLPHIN_WC_IS_STABLE "1")
-else()
-  set(DOLPHIN_WC_IS_STABLE "0")
-endif()
 
 # Remove in-tree revision information generated by Visual Studio
 # This is because the compiler will check in-tree first and use this, even if it is outdated
 file(REMOVE "${PROJECT_SOURCE_DIR}/Source/Core/Common/scmrev.h")
 
-configure_file(
-  "${PROJECT_SOURCE_DIR}/Source/Core/Common/scmrev.h.in"
-  "${PROJECT_BINARY_DIR}/Source/Core/Common/scmrev.h"
+file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/Source/Core/Common)
+if (NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/Source/Core/Common/scmrev.h)
+	file(TOUCH ${CMAKE_CURRENT_BINARY_DIR}/Source/Core/Common/scmrev.h)
+endif()
+
+find_package(Git)
+if(NOT GIT_FOUND)
+	set(GIT_EXECUTABLE "")
+endif()
+add_custom_target(
+	dolphin_scmrev
+	${CMAKE_COMMAND} -DPROJECT_SOURCE_DIR=${PROJECT_SOURCE_DIR} -DPROJECT_BINARY_DIR=${PROJECT_BINARY_DIR} -DDISTRIBUTOR=${DISTRIBUTOR} -DDOLPHIN_DEFAULT_UPDATE_TRACK=${DOLPHIN_DEFAULT_UPDATE_TRACK} -DGIT_FOUND=${GIT_FOUND} -DGIT_EXECUTABLE=${GIT_EXECUTABLE} -P ${CMAKE_SOURCE_DIR}/CMake/ScmRevGen.cmake
+	BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/Source/Core/Common/scmrev.h
+	VERBATIM
 )
+
+# This is here so #include "Common/scmrev.h" finds the generated header.
 include_directories("${PROJECT_BINARY_DIR}/Source/Core")
 
 ########################################
diff --git a/Source/Core/Common/CMakeLists.txt b/Source/Core/Common/CMakeLists.txt
index 144c229438..3092103b16 100644
--- a/Source/Core/Common/CMakeLists.txt
+++ b/Source/Core/Common/CMakeLists.txt
@@ -135,6 +135,8 @@ add_library(common
   WorkQueueThread.h
 )
 
+add_dependencies(common dolphin_scmrev)
+
 if(NOT MSVC AND _M_ARM_64)
   set_source_files_properties(
     Crypto/AES.cpp