Add support for -pie.

	* options.h (class General_options): Add -pie and
	--pic-executable.
	(General_options::output_is_position_independent): Test -pie.
	(General_options::output_is_executable): Return true if not shared
	and not relocatable.
	(General_options::output_is_pie): Remove.
	* options.cc (General_options::finalize): Reject incompatible uses
	of -pie.
	* gold.cc (queue_middle_tasks): A -pie link is not static.
	* symtab.h (Symbol::needs_plt_entry): Return false if -pie.
	* symtab.cc (Symbol::final_value_is_known): Return false if
	output_is_position_independent.
	* layout.cc (Layout::set_segment_offsets): Start at address 0 if
	output_is_position_independent.
	* output.cc (Output_file_header::do_sized_write): Use ET_DYN if
	output_is_position_independent.
	* i386.cc (Output_data_plt_i386::do_write): Use the PIC PLT if
	output_is_position_independent.
	* testsuite/Makefile.am (check_PROGRAMS): Add basic_pie_test and
	two_file_pie_test.
	(basic_pie_test.o, basic_pie_test): New targets.
	(two_file_test_1_pie.o, two_file_test_1b_pie.o): New targets.
	(two_file_test_2_pie.o, two_file_test_main_pie.o): New targets.
	(two_file_pie_test): New target.
	* testsuite/Makefile.in: Rebuild.
	* README: Remove note saying that -pie is not supported.

1 files changed, 8 insertions, 8 deletions

diff --git a/gold/options.h b/gold/options.h
index 1a03442..cbb45b5 100644
--- a/gold/options.h
+++ b/gold/options.h
@@ -763,6 +763,12 @@ class General_options
   DEFINE_string(oformat, options::EXACTLY_TWO_DASHES, '\0', "elf",
 		N_("Set output format"), N_("[binary]"));
 
+  DEFINE_bool(pie, options::ONE_DASH, '\0', false,
+	      N_("Create a position independent executable"), NULL);
+  DEFINE_bool_alias(pic_executable, pie, options::TWO_DASHES, '\0',
+		    N_("Create a position independent executable"), NULL,
+		    false);
+
 #ifdef ENABLE_PLUGINS
   DEFINE_special(plugin, options::TWO_DASHES, '\0',
                  N_("Load a plugin library"), N_("PLUGIN"));
@@ -1009,7 +1015,7 @@ class General_options
   // the output is position-independent or not.
   bool
   output_is_position_independent() const
-  { return this->shared(); }
+  { return this->shared() || this->pie(); }
 
   // Return true if the output is something that can be exec()ed, such
   // as a static executable, or a position-dependent or
@@ -1017,13 +1023,7 @@ class General_options
   // object file.
   bool
   output_is_executable() const
-  { return !this->shared() || this->output_is_pie(); }
-
-  // Return true if the output is a position-independent executable.
-  // This is currently not supported.
-  bool
-  output_is_pie() const
-  { return false; }
+  { return !this->shared() && !this->relocatable(); }
 
   // This would normally be static(), and defined automatically, but
   // since static is a keyword, we need to come up with our own name.