ld: Add --export-dynamic-symbol and --export-dynamic-symbol-list

--export-dynamic-symbol-list is like a dynamic list, but without
the symbolic property for unspecified symbols.

When creating an executable, --export-dynamic-symbol-list is treated
like --dynamic-list.

When creating a shared library, it is treated like --dynamic-list if
-Bsymbolic or --dynamic-list are used,  otherwise, it is ignored, so
that references to matched symbols will not be bound to the definitions
within the shared library.

	PR ld/25910
	* NEWS: Mention --export-dynamic-symbol[-list].
	* ld.texi: Document --export-dynamic-symbol[-list].
	* ldgram.y: Pass current_dynamic_list_p to
	lang_append_dynamic_list.
	* ldlang.c (current_dynamic_list_p): New.
	(ang_append_dynamic_list): Updated to take a pointer to
	struct bfd_elf_dynamic_list * argument instead of using
	link_info.dynamic_list.
	(lang_append_dynamic_list_cpp_typeinfo): Pass
	&link_info.dynamic_list to ang_append_dynamic_list.
	(lang_append_dynamic_list_cpp_new): Likewise.
	* ldlang.h (current_dynamic_list_p): New.
	(lang_append_dynamic_list): Add a pointer to
	struct bfd_elf_dynamic_list * argument.
	* ldlex.h (option_values): Add OPTION_EXPORT_DYNAMIC_SYMBOL and
	OPTION_EXPORT_DYNAMIC_SYMBOL_LIST.
	* lexsup.c (ld_options): Add entries for
	OPTION_EXPORT_DYNAMIC_SYMBOL and
	OPTION_EXPORT_DYNAMIC_SYMBOL_LIST.
	(parse_args): Handle --export-dynamic-symbol and
	--export-dynamic-symbol-list.
	* testsuite/ld-dynamic/export-dynamic-symbol-1.d: New.
	* testsuite/ld-dynamic/export-dynamic-symbol-2.d: New.
	* testsuite/ld-dynamic/export-dynamic-symbol-glob.d: New.
	* testsuite/ld-dynamic/export-dynamic-symbol-list-1.d: New.
	* testsuite/ld-dynamic/export-dynamic-symbol-list-2.d: New.
	* testsuite/ld-dynamic/export-dynamic-symbol-list-glob.d: New.
	* testsuite/ld-dynamic/export-dynamic-symbol.exp: New.
	* testsuite/ld-dynamic/export-dynamic-symbol.s: New.
	* testsuite/ld-dynamic/foo-bar.list: New.
	* testsuite/ld-dynamic/foo.list: New.
	* testsuite/ld-dynamic/foo.s: New.
	* testsuite/ld-dynamic/fstar.list: New.
	* testsuite/ld-elf/dlempty.list: New.
	* testsuite/ld-elf/shared.exp: Add tests for
	--export-dynamic-symbol and --export-dynamic-symbol-list.

1 files changed, 9 insertions, 7 deletions

diff --git a/ld/ldlang.c b/ld/ldlang.c
index 3d653d4..14a6a57 100644
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -118,6 +118,7 @@ lang_statement_list_type file_chain = { NULL, NULL };
    lang_statement_union).  */
 lang_statement_list_type input_file_chain;
 static const char *current_input_file;
+struct bfd_elf_dynamic_list **current_dynamic_list_p;
 struct bfd_sym_chain entry_symbol = { NULL, NULL };
 const char *entry_section = ".text";
 struct lang_input_statement_flags input_flags;
@@ -9324,15 +9325,16 @@ lang_add_unique (const char *name)
 /* Append the list of dynamic symbols to the existing one.  */
 
 void
-lang_append_dynamic_list (struct bfd_elf_version_expr *dynamic)
+lang_append_dynamic_list (struct bfd_elf_dynamic_list **list_p,
+			  struct bfd_elf_version_expr *dynamic)
 {
-  if (link_info.dynamic_list)
+  if (*list_p)
     {
       struct bfd_elf_version_expr *tail;
       for (tail = dynamic; tail->next != NULL; tail = tail->next)
 	;
-      tail->next = link_info.dynamic_list->head.list;
-      link_info.dynamic_list->head.list = dynamic;
+      tail->next = (*list_p)->head.list;
+      (*list_p)->head.list = dynamic;
     }
   else
     {
@@ -9341,7 +9343,7 @@ lang_append_dynamic_list (struct bfd_elf_version_expr *dynamic)
       d = (struct bfd_elf_dynamic_list *) xcalloc (1, sizeof *d);
       d->head.list = dynamic;
       d->match = lang_vers_match;
-      link_info.dynamic_list = d;
+      *list_p = d;
     }
 }
 
@@ -9363,7 +9365,7 @@ lang_append_dynamic_list_cpp_typeinfo (void)
     dynamic = lang_new_vers_pattern (dynamic, symbols [i], "C++",
 				     FALSE);
 
-  lang_append_dynamic_list (dynamic);
+  lang_append_dynamic_list (&link_info.dynamic_list, dynamic);
 }
 
 /* Append the list of C++ operator new and delete dynamic symbols to the
@@ -9384,7 +9386,7 @@ lang_append_dynamic_list_cpp_new (void)
     dynamic = lang_new_vers_pattern (dynamic, symbols [i], "C++",
 				     FALSE);
 
-  lang_append_dynamic_list (dynamic);
+  lang_append_dynamic_list (&link_info.dynamic_list, dynamic);
 }
 
 /* Scan a space and/or comma separated string of features.  */