Steal GCC's --time-report support.

* lib/timevar.c, lib/timevar.h, lib/timevar.def: New,
stolen/adjusted from GCC.
* m4/stage.m4: Remove time related checks.
* m4/timevar.m4: New.
* configure.in: Adjust.
* src/system.h: Adjust to using timevar.h.
* src/getargs.h, src/getargs.c: Support trace_time for
--trace=time.
* src/main.c (stage): Remove.
(main): Replace `stage' invocations with timevar calls.
* src/output.c: Insert pertinent timevar calls.

m4/Makefile.am

@@ -19,4 +19,5 @@ progtest.m4					\
 realloc.m4					\
 stage.m4					\
 strerror_r.m4					\
+timevar.m4					\
 warning.m4

m4/stage.m4

@@ -21,8 +21,8 @@
 # serial 1
 
 AC_DEFUN([BISON_PREREQ_STAGE],
-[AC_CHECK_HEADERS([malloc.h sys/times.h])
-AC_CHECK_FUNCS([mallinfo times])
+[AC_CHECK_HEADERS([malloc.h])
+AC_CHECK_FUNCS([mallinfo])
 
 AC_CHECK_TYPES([struct mallinfo], [], [],
 [$ac_includes_default
@@ -30,11 +30,4 @@ AC_CHECK_TYPES([struct mallinfo], [], [],
 # include <malloc.h>
 #endif
 ])
-
-AC_CHECK_TYPES([struct tms], [], [],
-[$ac_includes_default
-#if HAVE_SYS_TIMES_H
-# include <sys/times.h>
-#endif
-])
 ])

m4/timevar.m4

@@ -0,0 +1,47 @@
+# -*-Autoconf-*-
+# Checks required to run `stage', a nonportable memory/time tracker.
+#
+# Copyright (C) 2002 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+# 02111-1307  USA
+
+# serial 1
+
+AC_DEFUN([BISON_PREREQ_TIMEVAR],
+[AC_CHECK_HEADERS([sys/resource.h sys/times.h])
+
+AC_CHECK_FUNCS([times])
+
+AC_CHECK_DECLS([getrusage, times, clock, sysconf], [], [],
+[$ac_includes_default
+#if HAVE_SYS_RESOURCE_H
+# include <sys/resource.h>
+#endif
+#if HAVE_SYS_TIMES_H
+# include <sys/times.h>
+#endif
+])
+
+AC_CHECK_TYPES([clock_t, struct tms], [], [],
+[$ac_includes_default
+#if HAVE_SYS_RESOURCE_H
+# include <sys/resource.h>
+#endif
+#if HAVE_SYS_TIMES_H
+# include <sys/times.h>
+#endif
+])
+])