[patch 2/3] Extend C++ import to support renaming even declarations

[Jan Kratochvil <jan dot kratochvil at redhat dot com>]

Hi,

the current C++ using-directive supports renaming of namespaces but it does
not support renaming of specific imported declarations.  This is fine as C++
does not support the latter.

The Fortran patch 3/3 uses the existing FSF GDB C++ infrastructure, therefore
it had to extend it.

C++:     using namespace A;
Fortran: use A
	 - namespace import, therefore not a "declaration" import
	 - no renaming happens

C++:     using A::x;
Fortran: use A, only: x
	 - "declaration" import of the specific variable `x'.
	 - no renaming happens

namespace B = A;
Fortran has no way to address non-local namespace/module.
	 - namespace import, therefore not a "declaration" import
	 - renaming "A" to "B"

C++ cannot, it would be something like: using y = A::x;
Fortran: use A, only y => x
	 - "declaration" import of the specific variable `x'.
	 - renaming "x" to "y"

Therefore this patch implements the last case.  It does not affect existing
C++ functionality in the other 3 cases.

No regressions on {x86_64,x86_64-m32,i686}-fedora12-linux-gnu for the whole
patch series.


Thanks,
Jan


2010-04-30  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* cp-namespace.c (cp_lookup_symbol_imports): Support ALIAS for the
	CURRENT->DECLARATION case.

--- a/gdb/cp-namespace.c
+++ b/gdb/cp-namespace.c
@@ -355,12 +355,14 @@ cp_lookup_symbol_imports (const char *scope,
 	searched_cleanup = make_cleanup (reset_directive_searched, current);
 
 	/* If there is an import of a single declaration, compare the imported
-	   declaration with the sought out name.  If there is a match pass
-	   current->import_src as NAMESPACE to direct the search towards the
-	   imported namespace.  */
-	if (current->declaration && strcmp (name, current->declaration) == 0)
+	   declaration (after optional renaming by its alias) with the sought
+	   out name.  If there is a match pass current->import_src as NAMESPACE
+	   to direct the search towards the imported namespace.  */
+	if (current->declaration
+	    && strcmp (name, current->alias ? current->alias
+					    : current->declaration) == 0)
 	  sym = cp_lookup_symbol_in_namespace (current->import_src,
-	                                       name,
+	                                       current->declaration,
 	                                       block,
 	                                       domain);