Meta: Add an option to disable LTO for Release builds

Author: https://github.com/alimpfard
Commit: 0a958c8e16
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4256
Reviewed-by: https://github.com/R-Goc

Meta/CMake/lagom_compile_options.cmake

@@ -38,12 +38,14 @@ elseif (CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
 else()
     add_cxx_compile_options(-O3)
 
-    include(CheckIPOSupported)
-    check_ipo_supported(RESULT IPO_AVAILABLE OUTPUT output)
-    if(IPO_AVAILABLE)
-        set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
-    else()
-        message(WARNING "Not enabling IPO as it is not supported: ${output}")
+    if (ENABLE_LTO_FOR_RELEASE)
+        include(CheckIPOSupported)
+        check_ipo_supported(RESULT IPO_AVAILABLE OUTPUT output)
+        if(IPO_AVAILABLE)
+            set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+        else()
+            message(WARNING "Not enabling IPO as it is not supported: ${output}")
+        endif()
     endif()
 endif()
 

Meta/CMake/lagom_options.cmake

@@ -14,6 +14,7 @@ serenity_option(LAGOM_TOOLS_ONLY OFF CACHE BOOL "Don't build libraries, utilitie
 serenity_option(ENABLE_LAGOM_CCACHE ON CACHE BOOL "Enable ccache for Lagom builds")
 serenity_option(LAGOM_USE_LINKER "" CACHE STRING "The linker to use (e.g. lld, mold) instead of the system default")
 serenity_option(LAGOM_LINK_POOL_SIZE "" CACHE STRING "The maximum number of parallel jobs to use for linking")
+serenity_option(ENABLE_LTO_FOR_RELEASE ON CACHE BOOL "Enable link-time optimization for release builds")
 serenity_option(ENABLE_LAGOM_COVERAGE_COLLECTION OFF CACHE STRING "Enable code coverage instrumentation for lagom binaries in clang")
 
 if (ANDROID OR APPLE)