Shirona1337
ecc29d4e82
Before: MSBuild defaulted to a single process per project, so each vcxproj compiled its .cpp files sequentially. Local clean rebuild of OpenZen.dll + OpenZenLoader.exe measured ~14.6 s. After: same cold rebuild measures ~4.8 s — 3x faster — by combining - `cmake --build --parallel <Runtime.runtime.availableProcessors()>` in the buildNative task, which forwards a project-level `-m:N` to MSBuild and gets DLL / Loader to build concurrently where the dependency graph allows. - `/MP` on the MSVC compile options, which is the actual win: it lets cl.exe spawn one compiler process per available core within a single vcxproj. The DLL+Loader together have ~13 .cpp files; this is where the bulk of wall-time was being spent serially. CI runners get the same speed-up for free. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
50 lines
1.8 KiB
CMake
50 lines
1.8 KiB
CMake
cmake_minimum_required(VERSION 3.20)
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# CMP0091 NEW lets us drive the MSVC runtime via MSVC_RUNTIME_LIBRARY
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# instead of patching CMAKE_CXX_FLAGS_*. CMake 3.15+ default, set
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# explicitly so the build stays predictable across CMake versions.
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cmake_policy(SET CMP0091 NEW)
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project(OpenZenNative LANGUAGES CXX)
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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set(CMAKE_CXX_EXTENSIONS OFF)
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# Statically link the MSVC C/C++ runtime into both the loader EXE and the
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# injected DLL. This matters most for the DLL: our manual mapper resolves
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# import addresses locally and assumes the imported DLL has the same base
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# in both processes - true for kernel32/user32/ntdll (KnownDLLs) but NOT
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# for vcruntime140/ucrtbase, so the mapped DLL would otherwise call CRT
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# functions through wild pointers and crash the target Java process. /MT
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# eliminates those imports entirely.
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set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
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if(NOT DEFINED ENV{JAVA_HOME})
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message(FATAL_ERROR "JAVA_HOME must be set so we can locate jni.h / jvmti.h")
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endif()
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set(JDK_INCLUDE "$ENV{JAVA_HOME}/include")
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include_directories(${JDK_INCLUDE} ${JDK_INCLUDE}/win32)
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if(NOT WIN32)
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message(FATAL_ERROR "OpenZen native build only supports Windows")
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endif()
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add_compile_definitions(
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UNICODE
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_UNICODE
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WIN32_LEAN_AND_MEAN
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NOMINMAX
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)
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if(MSVC)
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# /MP enables cl.exe-level multi-process compilation: every translation
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# unit inside a single vcxproj compiles in parallel. Without it, MSBuild
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# only parallelises *across* projects (the -j N forwarded by
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# `cmake --build --parallel` controls that), so a single project with
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# a dozen .cpp files would still compile serially.
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add_compile_options(/W3 /permissive- /utf-8 /EHsc /MP)
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endif()
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add_subdirectory(dll)
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add_subdirectory(loader)
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