fix some issues with platform matching

direct/src/plugin/p3dHost.cxx

@@ -458,7 +458,10 @@ choose_suitable_platform(string &selected_platform,
                          const string &package_name,
                          const string &package_version,
                          const string &package_platform) {
+  nout << "choose_suitable_platform(" << package_name << ", " 
+       << package_version << ", " << package_platform << ")\n";
   if (_xcontents == NULL) {
+    nout << "  xcontents is null\n";
     return false;
   }
 
@@ -466,9 +469,9 @@ choose_suitable_platform(string &selected_platform,
 
   TiXmlElement *xpackage;
 
-  // For the "panda3d" package only, we allow searching for any
-  // available supported platform.
-  if (package_name == "panda3d" && package_platform == "") {
+  // If the platform is initially unspecified, we allow searching for
+  // any available supported platform.
+  if (package_platform == "") {
     int num_supported_platforms = inst_mgr->get_num_supported_platforms();
     for (int pi = 0; pi < num_supported_platforms; ++pi) {
       string supported_platform = inst_mgr->get_supported_platform(pi);
@@ -477,16 +480,20 @@ choose_suitable_platform(string &selected_platform,
         const char *name = xpackage->Attribute("name");
         const char *platform = xpackage->Attribute("platform");
         const char *version = xpackage->Attribute("version");
+        if (platform == NULL) {
+          platform = "";
+        }
         if (version == NULL) {
           version = "";
         }
-        if (name != NULL && platform != NULL &&
+        if (name != NULL &&
             package_name == name && 
             supported_platform == platform &&
             package_version == version) {
           // Here's the matching package definition.
           selected_platform = platform;
           per_platform = parse_bool_attrib(xpackage, "per_platform", false);
+          nout << "  found match for " << selected_platform << "\n";
           return true;
         }
         
@@ -497,28 +504,37 @@ choose_suitable_platform(string &selected_platform,
 
   // Now, we look for an exact match for the expected platform.
   xpackage = _xcontents->FirstChildElement("package");
+  nout << "  scanning, xpackage = " << xpackage << "\n";
   while (xpackage != NULL) {
     const char *name = xpackage->Attribute("name");
     const char *platform = xpackage->Attribute("platform");
     const char *version = xpackage->Attribute("version");
+    if (platform == NULL) {
+      platform = "";
+    }
     if (version == NULL) {
       version = "";
     }
-    if (name != NULL && platform != NULL &&
+    nout << "  considering " << name << ", " << platform << ", " << version
+         << "\n";
+    if (name != NULL &&
         package_name == name && 
         package_platform == platform &&
         package_version == version) {
       // Here's the matching package definition.
+      nout << "  match!\n";
       selected_platform = platform;
       per_platform = parse_bool_attrib(xpackage, "per_platform", false);
       return true;
     }
+    nout << "  no match.\n";
 
     xpackage = xpackage->NextSiblingElement("package");
   }
 
   // Look one more time, this time looking for a non-platform-specific
   // version.
+  nout << "  further scanning\n";
   xpackage = _xcontents->FirstChildElement("package");
   while (xpackage != NULL) {
     const char *name = xpackage->Attribute("name");
@@ -536,6 +552,7 @@ choose_suitable_platform(string &selected_platform,
         package_version == version) {
       selected_platform = platform;
       per_platform = parse_bool_attrib(xpackage, "per_platform", false);
+      nout << "  found empty platform\n";
       return true;
     }
 
@@ -543,6 +560,7 @@ choose_suitable_platform(string &selected_platform,
   }
 
   // Couldn't find a suitable platform.
+  nout << "  couldn't find.\n";
   return false;
 }
 
@@ -579,6 +597,9 @@ get_package_desc_file(FileSpec &desc_file,              // out
     const char *version = xpackage->Attribute("version");
     const char *seq = xpackage->Attribute("seq");
     const char *solo = xpackage->Attribute("solo");
+    if (platform == NULL) {
+      platform = "";
+    }
     if (version == NULL) {
       version = "";
     }

direct/src/plugin/p3dPackage.cxx

@@ -648,7 +648,7 @@ host_got_contents_file() {
     }
   } else {
     nout << "Couldn't find a platform for " << get_package_name()
-         << " matching " << inst_mgr->get_platform() << ".\n";
+         << " matching \"" << inst_mgr->get_platform() << "\".\n";
   }
 
   nout << "_per_platform for " << get_package_name() << " = " << _per_platform << "\n";
@@ -689,7 +689,8 @@ download_desc_file() {
                                     _package_name, _package_version,
                                     _package_platform)) {
     nout << "Couldn't find package " << _package_fullname
-         << " in contents file.\n";
+         << ", platform \"" << _package_platform
+         << "\" in contents file.\n";
     redownload_contents_file(NULL);
     return;
   }