gdb/

gdb/
	Fix resolving external references to TLS variables.
	* findvar.c: Include `objfiles.h'.
	(read_var_value <LOC_UNRESOLVED>): New variable `obj_section'.  Handle
	SEC_THREAD_LOCAL variables.
	* printcmd.c (address_info <LOC_UNRESOLVED>): Handle SEC_THREAD_LOCAL
	variables.

gdb/testsuite/
	Test resolving external references to TLS variables.
	* gdb.threads/tls.exp: New tests to examine A_THREAD_LOCAL and
	FILE2_THREAD_LOCAL.
	(testfile2, srcfile2): New variables.
	* gdb.threads/tls.c (file2_thread_local)
	(function_referencing_file2_thread_local): New.
	* gdb.threads/tls2.c: New file.