Compiling

Prerequisites

• JDK7+
• C++
  • Linux: gcc, clang or equivalent
  • macOS: XCode with Command Line Utilities
  • Windows: Microsoft Visual C++ or mingw-w64
• Maven, CMake
  • Linux: sudo apt install maven cmake g++
  • macOS: brew install maven cmake
  • Windows:
    • Manually install Maven from https://maven.apache.org/, adding mvn.bat directory to your %PATH%
    • Manually install CMake from https://cmake.org/download/, adding cmake.exe directory to your %PATH%

Setting up the Visual Studio Build Environment

• If compiling a Windows target with MSVC, you will need to initialize the environment using vcvarsall for the appropriate target architecture
  • win64 - "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x64
  • win32 - "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x64_x86
  • winaarch64 - "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x64_arm64

Steps

mvn                # compile for current system - default compile for native host
mvn -P mingw64     # cross-compile using mingw-w64 for Windows
mvn -P m32         # cross-compile using multi-lib for 32-bit Linux/Unix

   **MSVC cross compilation**

mvn -P win64       # cross-compile using MVSC for x86_64 Windows   
mvn -P win32       # cross-compile using MVSC for x86 Windows   
mvn -P winaarch64  # cross-compile using MVSC for Aarch64 Windows  (Pending/Unofficial; See pull request 84)

   **MacOS Xcode cross compilation                                                                     

mvn -P intelmac # cross-compile using Xcode for X86_64 MacOS
mvn -P armmac # cross-compile using Xcode for Aarch64 MacOS (Pending/unofficial; See #84)

* **Important:** Call `mvn clean` between different compiler profiles.
* **Note:** For other cross-compilation profiles or platforms search for `CMAKE_TOOLCHAIN_FILE` in `pom.xml`.  Each has a respective CMake toolchain file.
* **Note:** When compiling for Windows Arm64 target, make sure MSVC Arm64 Build Tools C++ # 'preferably the latest one' # tttt
* Prefer to skip maven? The project is configured to allow calling `cmake -DCMAKE_TOOLCHAIN_FILE=<...>` directly but the `javah` generated header file must be present.

### Package
Without recompiling native libraries
```bash
mvn -P package,jar-with-dependencies

Advanced

machine-dependent artifact

The build will output two .jar files in the target/ directory. One archive, which is build by the maven-jar-plugin, has a classifier which maches the machine's classifier (unless you are doing a cross-compile). This one will contain a freshly compiled library, like libjssc.so for Linux or a jssc.dll if you are on Windows. They go into a directory /natives/os_bitness.

»Uber-jar« artifact

The other .jar artifact which is generated by the build doesn't use the library compiled by cmake. It uses the checked-in libraries form the directory src/main/resources-precompiled/natives/. This jar is the artifact we are going to publish to maven central. It will contain a broader varieties of OSes and architectures in just one .jar file, but the libraries checked in into this git repository need to stay updated.

Creating just the »uber-jar« artifact

If you do not need a freshly compiled library, you can just execute mvn package -P package to skip the cmake compilation and the unit tests.