Access C++ library dependency & linkage from plugin? Trying to get dllimport, dllexport working correctly

[Eric_W_Barndollar]

Found a way to make this work. By adding an afterEvaluate action to the project, I can iterate over project.sources and then src.cpp.libs for each source.

So my plugin now does something like this:

public class MyCppPlugin implements Plugin<Project> {
  void apply(Project project) {
    project.apply(plugin: 'cpp')
      project.afterEvaluate {
      // Setup PROJECT_LIBRARY_DLLSPEC for exported libraries.
      project.libraries.each { lib ->
        setupDllExportSpec(project, lib.name,
            toMacroName(project.name, lib.name, "DLLSPEC"))
      }
        // Setup PROJECT_LIBRARY_DLLSPEC for imported libraries.
      project.sources.each { src ->
        src.cpp.libs.each { lib ->
          if (lib in Map) {
            setupDllImportSpec(project, src.name, lib.get("linkage"),
                toMacroName(lib.get("project"), lib.get("library"), "DLLSPEC"))
          }
        }
      }
    }
  }
    // ...
}

Then my setupDllImportSpec() and setupDllExportSpec() methods just iterate over project.binaries and look for matching library/binary names, defining the appropriate cppCompiler preprocessor macro to be __declspec(dllimport), __declspec(dllexport), or the empty string based on linkage.

Note also that I’m using PROJECT_LIBRARY_DLLSPEC macros instead of a single non-namespaced LIB_FUNC macro, since one exported shared library could depend on a different static library.

If there’s a simpler way to do this, I’m definitely open to suggestions. Otherwise, hope this answer helps anyone else trying to accomplish the same thing.