given:
        helloWorldApp.library.headerFiles.each { it.writeToDir(file("src/shared")) }

        file("src/main/cpp/main.cpp") << helloWorldApp.mainSource.content
        file("src/main/cpp2/hello.cpp") << helloWorldApp.librarySources[0].content
        file("src/main/sum-sources/sum.cpp") << helloWorldApp.librarySources[1].content

        and:
        buildFile << """
model {
    components {

#include "${p}lib${it + 1}.h"
<%
  }
} %>

<% functionCount.times { %>
long CPP_${functionName}_${it + 1} () {
  long sum = 1;
  // Call functions defined in dependent projects.
  <% projectDeps.each { p ->
    sourceFiles.times {
      def functionName = "${p}lib${it + 1}"
      functionCount.times {
  %>
  sum += CPP_${functionName}_${it + 1}();
  <%
      }
    }
  } %>
  return sum;
}

  long sum = 1;
  <% sourceFiles.times {
    def functionName = "lib${it + 1}"
    if (projectName != 'root') {
      functionName = "${projectName}${functionName}"
    }
    functionCount.times {
  %>
  sum += CPP_${functionName}_${it + 1}();
  <%
    }
  } %>
  printf("You made %d function calls!", sum);
  return 0;

            int func1();
            int func2();
"""
        file("src/main/cpp/main.cpp") << """
            #include <iostream>
            #include "funcs.h"
            int main () {
                std::cout << func1() << func2() << std::endl;
                return 0;
            }
"""
        file("src/main/cpp1/func1.cpp") << """
            int getOne();

            int func1() {

implementation-class=org.gradle.language.cpp.plugins.CppPlugin...

cpp-library-configurations.png...

// See the License for the specific language governing permissions and
// limitations under the License.

// dot -Tpng src/docs/userguide/img/cpp-library-configurations.dot > src/docs/userguide/img/cpp-library-configurations.png
digraph cppLibraryConfigurations {
  graph [ dpi = 100, fontname="Sans"];
  node [fontname = "Sans"];
  edge [fontname = "Sans"];

cpp-application-configurations.png...

// See the License for the specific language governing permissions and
// limitations under the License.

// dot -Tpng src/docs/userguide/img/cpp-application-configurations.dot > src/docs/userguide/img/cpp-application-configurations.png
digraph cppApplicationConfigurations {
  graph [ dpi = 100, fontname="Sans"];
  node [fontname = "Sans"];
  edge [fontname = "Sans"];

// See the License for the specific language governing permissions and
// limitations under the License.

// dot -Tpng src/docs/userguide/img/cpp-sourcesets-compilation.dot > src/docs/userguide/img/cpp-sourcesets-compilation.png
digraph cppSourcesetsCompilation {
  graph [ dpi = 100, fontname="Sans"];
  node [fontname = "Sans"];
  edge [fontname = "Sans"];