Question on linking osgEarth library

[faculaganymede]

osgEarth Gurus,

I have osgEarth 3.3 installed via vcpkg on Red Hat Linux 7.9. I created a very simple program to test that all the libraries are linking correctly. Below are my main code and CMakeLists.txt. This code compiles, builds, and runs OK.

However, target_link_libraries(${PROJECT_NAME} ... /home/facula/osgearth/build/lib/libosgEarth.so) is the only way I can get the code to compile and build. Is that the correct way to link the osgEarth library?

I tried these other approaches but they all resulted in linking errors:

target_link_libraries(${PROJECT_NAME} ... osgEarth)
target_link_libraries(${PROJECT_NAME} ... /home/facula/vcpkg/installed/x64-linux/lib/libosgEarth.a)
target_link_libraries(${PROJECT_NAME} ... ${osgEarth_LIBRARY})

main.cpp

#include <stdlib.h>
#include <stdio.h>
#include <iostream>

#include <osgDB/ReadFile>
#include <osgUtil/Optimizer>
#include <osg/CoordinateSystemNode>
#include <osg/ref_ptr>
#include <osgViewer/GraphicsWindow>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <osg/Camera>
#include <osg/ShapeDrawable>
#include <osg/StateSet>
#include <osg/Material>
#include <osgGA/EventQueue>
#include <osgGA/TrackballManipulator>
#include <osg/Notify>
#include <osg/DisplaySettings>

#include <osgEarth/Utils>
#include <osgEarth/Capabilities>
#include <osgEarth/Registry>
#include <osgEarth/MapNode>
#include <osgEarth/Controls>
#include <osgEarth/ExampleResources>
#include <osgEarth/EarthManipulator>

using namespace std;
using namespace osgEarth;
using namespace osgEarth::Util;
using namespace osgEarth::Util::Controls;

int main(int argc, char** argv)
{
	cout<<"Hello"<<endl;
	osgEarth::initialize();
	osg::ArgumentParser arguments(&argc, argv);
	return 1;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.25)
project(qtosg-hello)

set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)

find_package(OpenGL REQUIRED)
find_package(GLUT REQUIRED)
find_package(CURL REQUIRED)
find_package(Qt5 REQUIRED COMPONENTS Core Gui OpenGL)
find_package(OpenSceneGraph REQUIRED COMPONENTS osg osgDB osgGA osgUtil osgViewer)

set(SNAPPY_ROOT_DIR /home/facula/vcpkg/packages/snappy_x64-linux)
find_path(SNAPPY_INCLUDE_DIR NAMES snappy.h
                             PATHS ${SNAPPY_ROOT_DIR} ${SNAPPY_ROOT_DIR}/include)
find_library(SNAPPY_LIBRARIES NAMES snappy
                              PATHS ${SNAPPY_ROOT_DIR} ${SNAPPY_ROOT_DIR}/lib)

set(osgEarth_INCLUDE_DIR /home/facula/vcpkg/installed/x64-linux/include/osgEarth)
set(osgEarth_DIR /home/facula/vcpkg/installed/x64-linux/share/osgearth)

set(osgEarth_LIBRARY osgEarth)
find_package(osgEarth REQUIRED)

include_directories(
    ${OPENGL_INCLUDE_DIRS}
    ${GLUT_INCLUDE_DIRS}
    ${CURL_INCLUDE_DIRS}
    ${OPENSCENEGRAPH_INCLUDE_DIRS}
    ${SNAPPY_INCLUDE_DIR}
    ${osgEarth_INCLUDE_DIR}
    )

set(SOURCES
    main.cpp
    )

set(OPENSCENEGRAPH_LIBRARIES
    osg
    osgDB
    osgGA
    osgUtil
    osgViewer
    )

add_executable(${PROJECT_NAME} ${SOURCES})

target_link_libraries(${PROJECT_NAME}
    ${OPENSCENEGRAPH_LIBRARIES}
    ${SNAPPY_LIBRARIES}
    OpenThreads
    OpenGL::GL
    GLUT::GLUT
    CURL::libcurl
    Qt5::Core
    Qt5::Gui
    Qt5::OpenGL
    /home/facula/osgearth/build/lib/libosgEarth.so
    )

[gwaldron]

Hi. osgEarth uses the newer "Config" approach for CMake integration. Something like this should work.

find_package(OpenSceneGraph REQUIRED COMPONENTS osg osgDB osgGA osgUtil osgViewer)
find_package(osgEarth CONFIG REQUIRED)
...
target_link_libraries(${PROJECT_NAME} PRIVATE osgEarth)
target_link_libraries(${PROJECT_NAME} PRIVATE ${OPENSCENEGRAPH_LIBRARIES})