gdb/

gdb/
	* infrun.c (follow_exec): Replace symbol_file_add_main by
	symbol_file_add with SYMFILE_DEFER_BP_RESET, set_initial_language and
	breakpoint_re_set.
	* m32r-rom.c (m32r_load, m32r_upload_command): Use parameter 0 for
	clear_symtab_users.
	* objfiles.c (free_all_objfiles): Likewise.
	* remote-m32r-sdi.c (m32r_load): Likewise.
	* solib-som.c (som_solib_create_inferior_hook): Likewise.
	* symfile.c (new_symfile_objfile): New comment for add_flags.  Call
	clear_symtab_users with ADD_FLAGS.
	(reread_symbols): Use parameter 0 for clear_symtab_users.
	(clear_symtab_users): New parameter add_flags.  Do not call
	breakpoint_re_set if SYMFILE_DEFER_BP_RESET.
	(clear_symtab_users_cleanup): Use parameter 0 for clear_symtab_users.
	* symtab.h (clear_symtab_users): New parameter add_flags.

gdb/testsuite/
	* gdb.base/pie-execl.exp: New file.
	* gdb.base/pie-execl.c: New file.