From 0be2d94189c5fb672b25b110415a006877a3e515 Mon Sep 17 00:00:00 2001
From: Deamhan <workmailpk@gmail.com>
Date: Tue, 9 Jul 2019 18:22:07 +0300
Subject: [PATCH] CMake: add an option for using preferred release build flags

Add wxUSE_OPTIMISE build option.

See #18436.

Closes https://github.com/wxWidgets/wxWidgets/pull/1399
---
 build/cmake/init.cmake    | 32 ++++++++++++++++++++++++++++++++
 build/cmake/options.cmake |  7 +++++++
 2 files changed, 39 insertions(+)

diff --git a/build/cmake/init.cmake b/build/cmake/init.cmake
index 499408026c..5ad7bcdebd 100644
--- a/build/cmake/init.cmake
+++ b/build/cmake/init.cmake
@@ -37,11 +37,43 @@ if(MSVC)
         endif()
     endforeach()
 
+    if(wxBUILD_OPTIMISE)
+        set(MSVC_LINKER_RELEASE_FLAGS " /LTCG /OPT:REF /OPT:ICF")
+        wx_string_append(CMAKE_EXE_LINKER_FLAGS_RELEASE "${MSVC_LINKER_RELEASE_FLAGS}")
+        wx_string_append(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${MSVC_LINKER_RELEASE_FLAGS}")
+        wx_string_append(CMAKE_STATIC_LINKER_FLAGS_RELEASE " /LTCG")
+        set(MSVC_COMPILER_RELEASE_FLAGS " /Ox /Oi /Ot /Oy /GS- /Gy /GL /Gw")
+        wx_string_append(CMAKE_CXX_FLAGS_RELEASE "${MSVC_COMPILER_RELEASE_FLAGS}")
+        wx_string_append(CMAKE_C_FLAGS_RELEASE "${MSVC_COMPILER_RELEASE_FLAGS}")
+    endif()
+
+    if(NOT wxBUILD_STRIPPED_RELEASE)
+        set(MSVC_PDB_FLAG " /DEBUG")
+    endif()
+    wx_string_append(CMAKE_EXE_LINKER_FLAGS_RELEASE "${MSVC_PDB_FLAG}")
+    wx_string_append(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${MSVC_PDB_FLAG}")
+
     if(wxBUILD_MSVC_MULTIPROC)
         wx_string_append(CMAKE_C_FLAGS " /MP")
         wx_string_append(CMAKE_CXX_FLAGS " /MP")
     endif()
 elseif(("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang"))
+    if(wxBUILD_OPTIMISE)
+        set(GCC_PREFERRED_RELEASE_FLAGS " -O2 -fomit-frame-pointer")
+        wx_string_append(CMAKE_CXX_FLAGS_RELEASE "${GCC_PREFERRED_RELEASE_FLAGS}")
+        wx_string_append(CMAKE_C_FLAGS_RELEASE "${GCC_PREFERRED_RELEASE_FLAGS}")
+    endif()
+
+    if(wxBUILD_STRIPPED_RELEASE)
+        set(LD_STRIPPING_FLAG " -s")
+        wx_string_append(CMAKE_EXE_LINKER_FLAGS_RELEASE "${LD_STRIPPING_FLAG}")
+        wx_string_append(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${LD_STRIPPING_FLAG}")
+    else()
+        set(COMPILER_DBGSYM_FLAG " -g")
+        wx_string_append(CMAKE_CXX_FLAGS_RELEASE "${COMPILER_DBGSYM_FLAG}")
+        wx_string_append(CMAKE_C_FLAGS_RELEASE "${COMPILER_DBGSYM_FLAG}")
+    endif()
+
     if(wxBUILD_USE_STATIC_RUNTIME)
         if(MINGW)
             set(STATIC_LINKER_FLAGS " -static")
diff --git a/build/cmake/options.cmake b/build/cmake/options.cmake
index 13cb93c358..606ba6f75f 100644
--- a/build/cmake/options.cmake
+++ b/build/cmake/options.cmake
@@ -47,6 +47,13 @@ if(WIN32)
     set(wxBUILD_VENDOR "custom" CACHE STRING "Short string identifying your company (used in DLL name)")
 endif()
 
+wx_option(wxBUILD_OPTIMISE "use speed-optimised C/C++ compiler flags for release build" OFF)
+if(MSVC)
+    set(wxBUILD_STRIPPED_RELEASE_DEFAULT OFF)
+else()
+    set(wxBUILD_STRIPPED_RELEASE_DEFAULT ON)
+endif()
+wx_option(wxBUILD_STRIPPED_RELEASE "remove debug symbols in release build" ${wxBUILD_STRIPPED_RELEASE_DEFAULT})
 wx_option(wxUSE_NO_RTTI "disable RTTI support" OFF)
 
 # STL options