dbxgui sometime creates default configuration without a project exist, for example, when attaching, 
or debug remote executable, but dbxgui is getting default compiler set as GNU, 
it comes from constructor of CompilerSet2Configuration shown below, 
We need a MakeConfiguration API that specify the compiler set to "SunStudio"

public CompilerSet2Configuration(DevelopmentHostConfiguration dhconf) {
      this.dhconf = dhconf;
      String csName = getCompilerSetManager().getDefaultCompilerSet().getName();  <=== GNU
      if (csName == null || csName.length() == 0) {
          if (getCompilerSetManager().getCompilerSetNames().size() > 0) {
              csName = getCompilerSetManager().getCompilerSet(0).getName();
          } else {
              if (Utilities.getOperatingSystem() == Utilities.OS_SOLARIS)
                  csName = "Sun"; // NOI18N
              else
                  csName = "GNU"; // NOI18N
          }
      }
      compilerSetName = new StringConfiguration(null, csName);
      flavor = null;
      compilerSetNodeProp = null;
  }