build.xml

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<project name="llvm4jni">
    <target name="make">
        <echo message="Make native code" level="info"/>

        <mkdir dir="${project.build.directory}/native"/>

        <property environment="env"/>
        <fail unless="env.LLVM11_HOME" message="LLVM11_HOME not set."/>

        <condition property="platform" value="linux64">
            <os family="unix" arch="amd64" />
        </condition>

        <condition property="platform" value="mac">
            <os family="mac" arch="x86_64" />
        </condition>

        <condition property="cores.count" value="4">
            <os family="mac" arch="x86_64" />
        </condition>
        <exec executable="nproc" failonerror="false" failifexecutionfails="false" osfamily="unix" outputproperty="cores.count">
            <arg value="--all"/>
        </exec>

        <fail unless="platform" message="Not a supported platform."/>

        <condition property="lld" value="${env.LLVM11_HOME}/bin/ld.lld">
            <os family="unix" arch="amd64" />
        </condition>

        <fail message="lld ${lld} not set or missing">
            <condition>
                <and>
                    <not>
                        <available file="${lld}" />
                    </not>
                    <os family="unix" arch="amd64" />
                </and>
            </condition>
        </fail>

        <exec executable="cmake" dir="${project.build.directory}/native" failonerror="true" os="Linux">
            <arg line="-DCMAKE_C_COMPILER=&quot;${env.LLVM11_HOME}/bin/clang&quot; -DCMAKE_CXX_COMPILER=&quot;${env.LLVM11_HOME}/bin/clang++&quot; -DCMAKE_CXX_FLAGS=&quot;-flto -fforce-emit-vtables&quot; -DCMAKE_JNI_LINKER_FLAGS=&quot;-fuse-ld=${lld} -Xlinker -mllvm=-lto-embed-bitcode&quot; ${cmake.flags} ${basedir}"/>
        </exec>

        <echo message="CMake Flags: ${cmake.flags}" level="info"/>
        <echo message="Native Library Name: ${native.library.name}" level="info"/>

        <exec executable="cmake" dir="${project.build.directory}/native" failonerror="true" os="Mac OS X">
            <arg line="-DCMAKE_C_COMPILER=&quot;${env.LLVM11_HOME}/bin/clang&quot; -DCMAKE_CXX_COMPILER=&quot;${env.LLVM11_HOME}/bin/clang++&quot; -DCMAKE_CXX_FLAGS=&quot;-fforce-emit-vtables -flto -frtti&quot; ${cmake.flags} ${basedir}"/>
        </exec>

        <echo message="Make Flags: -j${cores.count}" level="info"/>
        <exec executable="make" dir="${project.build.directory}/native" failonerror="true">
            <arg line="VERBOSE=1 -j${cores.count}"/>
        </exec>
    </target>

    <target name="link-llvm-bitcode" depends="make">
        <echo message="Link bitcode" level="info"/>

        <exec executable="sh" dir="${project.build.directory}/native" failonerror="true" os="Mac OS X">
            <arg line="-c '${env.LLVM11_HOME}/bin/llvm-link ./bitcode/* -o ${native.library.name}.bc'" />
        </exec>

        <exec executable="cp" dir="${project.build.directory}/native" failonerror="true" os="Mac OS X">
            <arg line="${native.library.name}.bc ${project.build.directory}/classes"/>
        </exec>
    </target>

</project>