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Allow self-assignment for absolute symbols defined in a linker script

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Modifies ld machinery tracking linker script assignments to notice all
assignments, not just those symbols mentioned in DEFINED().

ld/
	PR ld/14962
	* ldlang.h (struct lang_definedness_hash_entry): Add by_object and
	by_script.  Make iteration a single bit field.
	(lang_track_definedness, lang_symbol_definition_iteration): Delete.
	(lang_symbol_defined): Declare.
	* ldlang.c (lang_statement_iteration): Expand comment a little.
	(lang_init <lang_definedness_table>): Make it bigger.
	(lang_track_definedness, lang_symbol_definition): Delete.
	(lang_definedness_newfunc): Update.
	(lang_symbol_defined): New function.
	(lang_update_definedness): Create entries here.  Do track whether
	script definition of symbol is valid, even when also defined in
	an object file.
	* ldexp.c (fold_name <DEFINED>): Update.
	(fold_name <NAME>): Allow self-assignment for absolute symbols
	defined in a linker script.
ld/testsuite/
	* ld-scripts/pr14962-2.d,
	* ld-scripts/pr14962-2.t: New test.
	* ld-scripts/expr.exp: Run it.
This commit is contained in:
Alan Modra
2014-01-20 21:28:42 +10:30
parent 24ef1aa73e
commit fa72205cb9
8 changed files with 98 additions and 60 deletions
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7
ld/ldlang.h
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@@ -465,7 +465,9 @@ struct unique_sections
struct lang_definedness_hash_entry
{
struct bfd_hash_entry root;
int iteration;
unsigned int by_object : 1;
unsigned int by_script : 1;
unsigned int iteration : 1;
};
/* Used by place_orphan to keep track of orphan sections and statements. */
@@ -658,8 +660,7 @@ extern void lang_add_unique
(const char *);
extern const char *lang_get_output_target
(void);
extern void lang_track_definedness (const char *);
extern int lang_symbol_definition_iteration (const char *);
extern struct lang_definedness_hash_entry *lang_symbol_defined (const char *);
extern void lang_update_definedness
(const char *, struct bfd_link_hash_entry *);