c-common.c (handle_visibility_attribute): Accept "default".

	* c-common.c (handle_visibility_attribute): Accept "default".
	* tree.h (enum symbol_visibility): New.
	(decl_visibility): Declare.
	* target.h (gcc_target.visibility): Take visibility arg as integer.
	* varasm.c (default_assemble_visibility): Likewise.
	(decl_visibility): New.
	(maybe_assemble_visibility): Use it.
	* output.h (default_assemble_visibility): Update prototype.
	* config/rs6000/rs6000.c (rs6000_assemble_visibility): Take
	visibility arg as integer.
	* doc/extend.texi: Document default visibility.

From-SVN: r59560

gcc/ChangeLog

@@ -10,6 +10,7 @@
 	* output.h (default_assemble_visibility): Update prototype.
 	* config/rs6000/rs6000.c (rs6000_assemble_visibility): Take
 	visibility arg as integer.
+	* doc/extend.texi: Document default visibility.
 
 2002-11-26  Kazu Hirata  <kazu@cs.umass.edu>
 

gcc/doc/extend.texi

@@ -2307,7 +2307,7 @@ Not all target machines support this attribute.
 @item visibility ("@var{visibility_type}")
 @cindex @code{visibility} attribute
 The @code{visibility} attribute on ELF targets causes the declaration
-to be emitted with hidden, protected or internal visibility.
+to be emitted with default, hidden, protected or internal visibility.
 
 @smallexample
 void __attribute__ ((visibility ("protected")))
@@ -2318,6 +2318,11 @@ int i __attribute__ ((visibility ("hidden")));
 See the ELF gABI for complete details, but the short story is
 
 @table @dfn
+@item default
+Default visibility is the normal case for ELF.  This value is 
+available for the visibiliy attribute to override other options
+that may change the assumed visibility of symbols.
+
 @item hidden
 Hidden visibility indicates that the symbol will not be placed into
 the dynamic symbol table, so no other @dfn{module} (executable or