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-Bsymbolic is not for PIEs

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Despite PR19615, it doesn't make sense to use -Bsymbolic with PIEs.
Dynamic symbols in an executable won't be overridden anyway.

	* ld.texi (-Bsymbolic, -Bsymbolic-functions): Don't mention PIEs.
	* ld.h (symbolic_enum, dynamic_list_enum),
	(args_type <symbolic, dynamic_list>): Move to..
	* lexsup.c (parse_args): ..here, using auto vars opt_symbolic
	and opt_dynamic_list rather than command_line fields.  Only
	act on -Bsymbolic and -Bsymbolic-functions for shared library
	output.  Free dynamic_list.
This commit is contained in:
Alan Modra 2019-09-23 23:01:37 +09:30
parent df07e2c772
commit 1914e26482
4 changed files with 68 additions and 72 deletions
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10
ld/ChangeLog
View File

@ -1,3 +1,13 @@
2019-10-02 Alan Modra <amodra@gmail.com>
* ld.texi (-Bsymbolic, -Bsymbolic-functions): Don't mention PIEs.
* ld.h (symbolic_enum, dynamic_list_enum),
(args_type <symbolic, dynamic_list>): Move to..
* lexsup.c (parse_args): ..here, using auto vars opt_symbolic
and opt_dynamic_list rather than command_line fields. Only
act on -Bsymbolic and -Bsymbolic-functions for shared library
output. Free dynamic_list.
2019-09-26 Alan Modra <amodra@gmail.com>
PR 24262

21
ld/ld.h
View File

@ -119,20 +119,6 @@ struct wildcard_list
enum endian_enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE };
enum symbolic_enum
{
symbolic_unset = 0,
symbolic,
symbolic_functions,
};
enum dynamic_list_enum
{
dynamic_list_unset = 0,
dynamic_list_data,
dynamic_list
};
typedef struct
{
/* 1 => assign space to common symbols even if `relocatable_output'. */
@ -183,13 +169,6 @@ typedef struct
/* Big or little endian as set on command line. */
enum endian_enum endian;
/* -Bsymbolic and -Bsymbolic-functions, as set on command line. */
enum symbolic_enum symbolic;
/* --dynamic-list, --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo
and --dynamic-list FILE, as set on command line. */
enum dynamic_list_enum dynamic_list;
/* Name of runtime interpreter to invoke. */
char *interpreter;

12
ld/ld.texi
View File

@ -1436,21 +1436,15 @@ libraries.
When creating a shared library, bind references to global symbols to the
definition within the shared library, if any. Normally, it is possible
for a program linked against a shared library to override the definition
within the shared library. This option can also be used with the
@option{--export-dynamic} option, when creating a position independent
executable, to bind references to global symbols to the definition within
the executable. This option is only meaningful on ELF platforms which
support shared libraries and position independent executables.
within the shared library. This option is only meaningful on ELF
platforms which support shared libraries.
@kindex -Bsymbolic-functions
@item -Bsymbolic-functions
When creating a shared library, bind references to global function
symbols to the definition within the shared library, if any.
This option can also be used with the @option{--export-dynamic} option,
when creating a position independent executable, to bind references
to global function symbols to the definition within the executable.
This option is only meaningful on ELF platforms which support shared
libraries and position independent executables.
libraries.
@kindex --dynamic-list=@var{dynamic-list-file}
@item --dynamic-list=@var{dynamic-list-file}

97
ld/lexsup.c
View File

@ -565,6 +565,18 @@ parse_args (unsigned argc, char **argv)
struct option *really_longopts;
int last_optind;
enum report_method how_to_report_unresolved_symbols = RM_GENERATE_ERROR;
enum symbolic_enum
{
symbolic_unset = 0,
symbolic,
symbolic_functions,
} opt_symbolic = symbolic_unset;
enum dynamic_list_enum
{
dynamic_list_unset = 0,
dynamic_list_data,
dynamic_list
} opt_dynamic_list = dynamic_list_unset;
shortopts = (char *) xmalloc (OPTION_COUNT * 3 + 2);
longopts = (struct option *)
@ -1233,10 +1245,10 @@ parse_args (unsigned argc, char **argv)
config.stats = TRUE;
break;
case OPTION_SYMBOLIC:
command_line.symbolic = symbolic;
opt_symbolic = symbolic;
break;
case OPTION_SYMBOLIC_FUNCTIONS:
command_line.symbolic = symbolic_functions;
opt_symbolic = symbolic_functions;
break;
case 't':
++trace_files;
@ -1381,23 +1393,23 @@ parse_args (unsigned argc, char **argv)
command_line.version_exports_section = optarg;
break;
case OPTION_DYNAMIC_LIST_DATA:
command_line.dynamic_list = dynamic_list_data;
if (command_line.symbolic == symbolic)
command_line.symbolic = symbolic_unset;
opt_dynamic_list = dynamic_list_data;
if (opt_symbolic == symbolic)
opt_symbolic = symbolic_unset;
break;
case OPTION_DYNAMIC_LIST_CPP_TYPEINFO:
lang_append_dynamic_list_cpp_typeinfo ();
if (command_line.dynamic_list != dynamic_list_data)
command_line.dynamic_list = dynamic_list;
if (command_line.symbolic == symbolic)
command_line.symbolic = symbolic_unset;
if (opt_dynamic_list != dynamic_list_data)
opt_dynamic_list = dynamic_list;
if (opt_symbolic == symbolic)
opt_symbolic = symbolic_unset;
break;
case OPTION_DYNAMIC_LIST_CPP_NEW:
lang_append_dynamic_list_cpp_new ();
if (command_line.dynamic_list != dynamic_list_data)
command_line.dynamic_list = dynamic_list;
if (command_line.symbolic == symbolic)
command_line.symbolic = symbolic_unset;
if (opt_dynamic_list != dynamic_list_data)
opt_dynamic_list = dynamic_list;
if (opt_symbolic == symbolic)
opt_symbolic = symbolic_unset;
break;
case OPTION_DYNAMIC_LIST:
/* This option indicates a small script that only specifies
@ -1412,10 +1424,10 @@ parse_args (unsigned argc, char **argv)
parser_input = input_dynamic_list;
yyparse ();
}
if (command_line.dynamic_list != dynamic_list_data)
command_line.dynamic_list = dynamic_list;
if (command_line.symbolic == symbolic)
command_line.symbolic = symbolic_unset;
if (opt_dynamic_list != dynamic_list_data)
opt_dynamic_list = dynamic_list;
if (opt_symbolic == symbolic)
opt_symbolic = symbolic_unset;
break;
case OPTION_WARN_COMMON:
config.warn_common = TRUE;
@ -1625,32 +1637,33 @@ parse_args (unsigned argc, char **argv)
&& command_line.check_section_addresses < 0)
command_line.check_section_addresses = 0;
/* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
--dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
--dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
for PIC outputs. -Bsymbolic overrides all others and vice versa. */
switch (command_line.symbolic)
{
case symbolic_unset:
break;
case symbolic:
/* -Bsymbolic is for PIC output only. */
if (bfd_link_pic (&link_info))
{
link_info.symbolic = TRUE;
/* Should we free the unused memory? */
link_info.dynamic_list = NULL;
command_line.dynamic_list = dynamic_list_unset;
}
break;
case symbolic_functions:
/* -Bsymbolic-functions is for PIC output only. */
if (bfd_link_pic (&link_info))
command_line.dynamic_list = dynamic_list_data;
break;
}
/* -Bsymbolic and -Bsymbols-functions are for shared library output. */
if (bfd_link_dll (&link_info))
switch (opt_symbolic)
{
case symbolic_unset:
break;
case symbolic:
link_info.symbolic = TRUE;
if (link_info.dynamic_list)
{
struct bfd_elf_version_expr *ent, *next;
for (ent = link_info.dynamic_list->head.list; ent; ent = next)
{
next = ent->next;
free (ent);
}
free (link_info.dynamic_list);
link_info.dynamic_list = NULL;
}
opt_dynamic_list = dynamic_list_unset;
break;
case symbolic_functions:
opt_dynamic_list = dynamic_list_data;
break;
}
switch (command_line.dynamic_list)
switch (opt_dynamic_list)
{
case dynamic_list_unset:
break;