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Jau Support Library (C++, Java, ...)

Original document location.

Git Repository

This project's canonical repositories is hosted on Gothel Software.

Goals

This project aims to provide general C++ and Java collections, algorithms and utilities - as well as basic concepts to support a Java JNI binding.

This project was extracted from Direct-BT to enable general use and enforce better encapsulation.

API Documentation

Up to date API documentation can be found:

Examples

See Direct-BT C++ API Doc.

Supported Platforms

Minimum language requirements

  • C++17
  • Java 11 (optional)

See supported platforms for details.

Building Binaries

It is advised to include this library into your main project, e.g. as a git-submodule.

Then add jaulib/include/ to your C++ include-path and also add the C++ source files under jaulib/src/ into your build recipe.

The produced Java libraries are fully functional.

This library's build recipe are functional though, but currently only intended to support unit testing and to produce a Doxygen API doc.

Build Dependencies

  • CMake 3.13+ but >= 3.18 is recommended
  • gcc >= 8.3.0
    • or clang >= 10.0
  • Optional
    • libunwind8 >= 1.2.1
    • libcurl4 >= 7.74 (tested, lower may work)
    • For Java support
      • OpenJDK >= 11
      • junit4 >= 4.12

Install on FreeBSD

Installing build dependencies on FreeBSD >= 13:

pkg install git
pkg install sudo
pkg install cmake
pkg install libunwind
pkg install doxygen
pkg install squashfs-tools
pkg install bash
ln -s /usr/local/bin/bash /bin/bash

Install optional Java dependencies:

pkg install openjdk17
pkg install openjdk17-jre
pkg install junit
rehash

For Java ensure /etc/fstab includes:

fdesc   /dev/fd         fdescfs         rw      0       0
proc    /proc           procfs          rw      0       0

jau::fs::mount_image() and jau::fs::umount() are currenly not fully implemented under FreeBSD, hence testing using cmake option -DTEST_WITH_SUDO=ON is disabled.

To use URL streaming functionality via the curl library in jau_io_util.hpp and jau/io_util.cpp, the cmake option -DUSE_LIBCURL=ON must be set.
This also requires installation of the following packets:

pkg install curl
apt install mini-httpd

Note: mini-httpd is being used for unit testing URL streaming only.

Install on Debian or Ubuntu

Installing build dependencies on Debian >= 11 and Ubuntu >= 20.04:

apt install git
apt install build-essential g++ gcc libc-dev libpthread-stubs0-dev 
apt install libunwind8 libunwind-dev
apt install cmake cmake-extras extra-cmake-modules
apt install doxygen graphviz

Install optional Java dependencies:

apt install openjdk-17-jdk openjdk-17-jre junit4

To test jau::fs::mount_image() and jau::fs::umount() under Linux with enabled cmake option -DTEST_WITH_SUDO=ON,
the following build dependencies are added

apt install libcap-dev libcap2-bin
apt install squashfs-tools

To use URL streaming functionality via the curl library in jau_io_util.hpp and jau/io_util.cpp, the cmake option -DUSE_LIBCURL=ON must be set.
This also requires installation of the following packets:

apt install libcurl4 libcurl4-gnutls-dev
apt install mini-httpd

Note: mini-httpd is being used for unit testing URL streaming only.

Build Procedure

For a generic build use:

CPU_COUNT=`getconf _NPROCESSORS_ONLN`
git clone https://jausoft.com/cgit/jaulib.git
cd jaulib
mkdir build
cd build
cmake -DBUILDJAVA=ON -DBUILDEXAMPLES=ON -DBUILD_TESTING=ON ..
make -j $CPU_COUNT install
make test
make doc

The install target of the last command will create the include/ and lib/ directories with a copy of the headers and library objects respectively in your build location. Note that doing an out-of-source build may cause issues when rebuilding later on.

You may also invoke scripts/build.sh, which resolves installed environment variables like JAVA_HOME and JUNIT_CP as well as building and distributing using os_arch type folders.

  • scripts/setup-machine-arch.sh .. generic setup for all scripts
  • scripts/build.sh .. initial build incl. install and unit testing
  • scripts/rebuild.sh .. rebuild
  • scripts/build-cross.sh .. cross-build
  • scripts/rebuild-cross.sh .. cross-build
  • scripts/test_java.sh .. invoke a java unit test
  • scripts/test_exe_template.sh .. invoke the symlink'ed files to invoke native unit tests

Our cmake configure has a number of options, cmake-gui or ccmake can show you all the options. The interesting ones are detailed below:

Changing install path from /usr/local to /usr

-DCMAKE_INSTALL_PREFIX=/usr

Building debug build:

-DDEBUG=ON

Add unit tests to build (default: disabled)

-DBUILD_TESTING=ON

Add unit tests requiring sudo to build (default: disabled).
This option requires -DBUILD_TESTING=ON to be effective.
Covered unit test requiring sudo are currently

  • Linux OS
    • jau::fs::mount_image()
    • jau::fs::umount()
-DTEST_WITH_SUDO=ON

Disable stripping native lib even in non debug build:

-DUSE_STRIP=OFF

Enable using libcurl (default: disabled)

-DUSE_LIBCURL=ON

Enable using libunwind (default: disabled)

-DUSE_LIBUNWIND=ON

Disable using C++ Runtime Type Information (RTTI) (default: enabled)

-DDONT_USE_RTTI=ON

Override default javac debug arguments source,lines:

-DJAVAC_DEBUG_ARGS="source,lines,vars"

-DJAVAC_DEBUG_ARGS="none"

Building debug and instrumentation (sanitizer) build:

-DDEBUG=ON -DINSTRUMENTATION=ON

Using clang instead of gcc:

-DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++

Cross-compiling on a different system:

-DCMAKE_CXX_FLAGS:STRING=-m32 -march=i586
-DCMAKE_C_FLAGS:STRING=-m32 -march=i586

To build Java bindings:

-DBUILDJAVA=ON

To build documentation run:

make doc

Cross Build

Also provided is a cross-build script using chroot into a target system using QEMU User space emulation and Linux kernel binfmt_misc to run on other architectures than the host.

See Build Procedure for general overview.

You may use our pi-gen branch to produce a Raspi-arm64, Raspi-armhf or PC-amd64 target image.

Changes

See Changes.

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