support/scripts: do not display virtual packages in generated lists

If a package has both a 'real' and a 'virtual' definition, consider it
is a virtual package and do not display it in the generated package list.

This is the case for jpeg and cryptodev, that are virtual packages, but
also real (but empty) packages used to provide a prompt to enable/disable
a choice to select an implementation. In this case, we do not want to
list the virtual packages, but only their implementations.

So, consider packages that are both real and virtual as virtual packages.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Samuel Martin <s.martin49@gmail.com>
Acked-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

support/scripts/gen-manual-lists.py

@@ -279,13 +279,30 @@ class Buildroot:
                     pkg_list.append(re.sub(r"(.*?)\.mk", r"\1", file_))
             setattr(self, "_package_list", pkg_list)
         for pkg in getattr(self, "_package_list"):
-            if pattern.match(pkg):
-                return True
+            if type == 'real':
+                if pattern.match(pkg) and not self._exists_virt_symbol(pkg):
+                    return True
         return False
 
     def _is_real_package(self, symbol):
         return self._is_package(symbol, 'real')
 
+    def _exists_virt_symbol(self, pkg_name):
+        """ Return True if a symbol exists that defines the package as
+        a virtual package, False otherwise
+
+        :param pkg_name:    The name of the package, for which to check if
+                            a symbol exists defining it as a virtual package
+
+        """
+        virt_pattern = "BR2_PACKAGE_HAS_" + pkg_name + "$"
+        virt_pattern = re.sub("_", ".", virt_pattern)
+        virt_pattern = re.compile(virt_pattern, re.IGNORECASE)
+        for sym in self.config:
+            if virt_pattern.match(sym.get_name()):
+                return True
+        return False
+
     def _get_pkg_name(self, symbol):
         """ Return the package name of the specified symbol.