[GOLD] Power10 stub selection

gold version of commit e10a07b32dc1.

	* options.h (DEFINE_enum): Add optional_arg__ param, adjust
	all uses.
	(General_options): Add --power10-stubs and --no-power10-stubs.
	* options.cc (General_options::finalize): Handle --power10-stubs.
	* powerpc.cc (set_power10_stubs): Don't set when --power10-stubs=no.
	(power10_stubs_auto): New.
	(struct Plt_stub_ent): Add toc_ and tocoff_.  Don't use a bitfield
	for indx_.
	(struct Branch_stub_ent): Add toc_and tocoff_.  Use bitfields for
	iter_, notoc_ and save_res_.
	(add_plt_call_entry): Set toc_.  Adjust resizing conditions for
	--power10-stubs=auto.
	(add_long_branch_entry): Set toc_.
	(add_eh_frame, define_stub_syms): No longer use const_iterators
	for plt and long branch stub iteration.
	(build_tls_opt_head, build_tls_opt_tail): Change parameters and
	return value.  Move tests for __tls_get_addr to callers.
	(plt_call_size): Handle --power10-stubs=auto.
	(branch_stub_size): Likewise.
	(Stub_table::do_write): Likewise.
	(relocate): Likewise.

1 files changed, 29 insertions, 0 deletions

diff --git a/gold/options.cc b/gold/options.cc
index b13ae71..6b19437 100644
--- a/gold/options.cc
+++ b/gold/options.cc
@@ -465,6 +465,14 @@ General_options::parse_plugin_opt(const char*, const char* arg,
 }
 
 void
+General_options::parse_no_power10_stubs(const char*, const char*,
+					Command_line*)
+{
+  this->set_power10_stubs("no");
+  this->set_user_set_power10_stubs();
+}
+
+void
 General_options::parse_R(const char* option, const char* arg,
 			 Command_line* cmdline)
 {
@@ -1183,6 +1191,27 @@ General_options::finalize()
         this->set_start_stop_visibility_enum(elfcpp::STV_PROTECTED);
     }
 
+  // Parse the --power10-stubs argument.
+  if (!this->user_set_power10_stubs())
+    {
+      // --power10-stubs without an arg is equivalent to --power10-stubs=yes
+      // but not specifying --power10-stubs at all should be equivalent to
+      // --power10-stubs=auto.  This doesn't fit into the notion of
+      // "default_value", used both as a static initializer and to provide
+      // a missing optional arg.  Fix it here.
+      this->set_power10_stubs("auto");
+      this->set_power10_stubs_enum(POWER10_STUBS_AUTO);
+    }
+  else
+    {
+      if (strcmp(this->power10_stubs(), "auto") == 0)
+	this->set_power10_stubs_enum(POWER10_STUBS_AUTO);
+      else if (strcmp(this->power10_stubs(), "no") == 0)
+	this->set_power10_stubs_enum(POWER10_STUBS_NO);
+      else if (strcmp(this->power10_stubs(), "yes") == 0)
+	this->set_power10_stubs_enum(POWER10_STUBS_YES);
+    }
+
   // -M is equivalent to "-Map -".
   if (this->print_map() && !this->user_set_Map())
     {