This is example bridging C++ to java and swift for my educational purposes

JAVA binding

setup developer environment on Ubuntu

Note zulu java JDK distribution is used. in case of some other JDK use please update environment variable JAVA_INC accordingly

apt-get update
apt-get -y install cmake build-essential
cd /tmp
wget https://cdn.azul.com/zulu/bin/zulu11.56.19-ca-jdk11.0.15-linux_amd64.deb
apt -y install ./zulu11.56.19-ca-jdk11.0.15-linux_amd64.deb

build shared libraries

export JAVA_INC=/usr/lib/jvm/zulu-11-amd64/include
cmake --configure .
cmake --build .

run java binding example

cd binding/java
javac MapboxJNI.java
java -Djava.library.path=. MapboxJNI

SWIFT binding

setup developer environment on Ubuntu

apt-get -y install \
          binutils \
          git \
          gnupg2 \
          libc6-dev \
          libcurl4 \
          libedit2 \
          libgcc-9-dev \
          libpython2.7 \
          libsqlite3-0 \
          libstdc++-9-dev \
          libxml2 \
          libz3-dev \
          pkg-config \
          tzdata \
          uuid-dev \
          zlib1g-dev
cd /tmp
wget https://download.swift.org/swift-5.6.1-release/ubuntu2004/swift-5.6.1-RELEASE/swift-5.6.1-RELEASE-ubuntu20.04.tar.gz
tar xzf swift-5.6.1-RELEASE-ubuntu20.04.tar.gz
mv swift-5.6.1-RELEASE-ubuntu20.04 /usr/share/swift
echo "export PATH=/usr/share/swift/usr/bin:$PATH" >> ~/.bashrc
source ~/.bashrc

run example

cd binding/mapboxswift
swift run

General comments

TODO: map C++ sources are duplicated for java and swift because swift package manager requires certain directory structure. I could re-layout the project to make 'mapgl' folder shared between two build systems : CMake and Swift SPM not sure how good is to put symbolic links to 'mapgl' folder under source control. Symbolic link shall be created dynamically in a build pipeline i think.