cppexp.c (parse_defined): Mark macro used.

	* cppexp.c (parse_defined): Mark macro used.
	* cpphash.h (struct cpp_macro): New member "used".
	(_cpp_mark_macro_used, _cpp_warn_if_unused_macro): New.
	(struct cpp_reader): New member.
	* cppinit.c (cpp_finish_options): Set first_unused_line.
	(cpp_finish): Warn of unused macros if requested.
	(OPT_TABLE): New switches.
	(cpp_handle_option): Handle them.
	* cpplib.c (do_undef): Warn if macro unused.
	(do_ifdef, do_ifndef): Mark macro used.
	* cpplib.h (struct cpp_options): New member.
	* cppmacro.c (_cpp_warn_if_unused_macro): New.
	(enter_macro_context): Mark macro used.
	(_cpp_create_definition): Mark macro unused; warn if unused
	when redefined.
	* cpptrad.c (scan_out_logcial_line, push_replacement_text):
	Mark macros used.
	* doc/cppopts.texi: Update.
testsuite:
	* gcc.dg/cpp/trad/Wunused.c, gcc.dg/cpp/trad/Wunused.h,
	gcc.dg/cpp/Wunused.c, gcc.dg/cpp/Wunused.h: New tests.

From-SVN: r55692

1 files changed, 2 insertions, 0 deletions

diff --git a/gcc/cpptrad.c b/gcc/cpptrad.c
index e8b5a1e..51b0bfc 100644
--- a/gcc/cpptrad.c
+++ b/gcc/cpptrad.c
@@ -655,6 +655,7 @@ scan_out_logical_line (pfile, macro)
 		{
 		  cpp_macro *m = fmacro.node->value.macro;
 
+		  m->used = 1;
 		  lex_state = ls_none;
 		  save_argument (&fmacro, out - pfile->out.base);
 
@@ -789,6 +790,7 @@ push_replacement_text (pfile, node)
   else
     {
       cpp_macro *macro = node->value.macro;
+      macro->used = 1;
       text = macro->exp.text;
       len = macro->count;
     }