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Diffstat (limited to 'mcon/U/d_difftime.U')
| -rw-r--r-- | mcon/U/d_difftime.U | 71 |
1 files changed, 59 insertions, 12 deletions
diff --git a/mcon/U/d_difftime.U b/mcon/U/d_difftime.U index c456c8f..34e9430 100644 --- a/mcon/U/d_difftime.U +++ b/mcon/U/d_difftime.U @@ -1,33 +1,80 @@ -?RCS: $Id: d_difftime.U 1 2006-08-24 12:32:52Z rmanfredi $ +?RCS: $Id: d_difftime.U 167 2013-05-08 17:58:00Z rmanfredi $ ?RCS: -?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi +?RCS: Copyright (c) 1991-1997, 2004-2006, 2013 Raphael Manfredi ?RCS: -?RCS: You may redistribute only under the terms of the Artistic Licence, +?RCS: You may redistribute only under the terms of the Artistic License, ?RCS: as specified in the README file that comes with the distribution. ?RCS: You may reuse parts of this distribution only within the terms of -?RCS: that same Artistic Licence; a copy of which may be found at the root +?RCS: that same Artistic License; a copy of which may be found at the root ?RCS: of the source tree for dist 4.0. ?RCS: ?RCS: Original Author: Andy Dougherty <doughera@lafcol.lafayette.edu> ?RCS: -?RCS: $Log: d_difftime.U,v $ -?RCS: Revision 3.0.1.1 1994/08/29 16:07:31 ram -?RCS: patch32: created by ADO -?RCS: -?MAKE:d_difftime: Inlibc +?MAKE:d_difftime use_difftime: Assert Trylink cat ?MAKE: -pick add $@ %< ?S:d_difftime: ?S: This variable conditionally defines the HAS_DIFFTIME symbol, which ?S: indicates to the C program that the difftime() routine is available. ?S:. +?S:use_difftime: +?S: This variable conditionally defines the USE_DIFFTIME symbol, which +?S: indicates to the C program that the difftime() routine should be +?S: used to compare times. +?S:. ?C:HAS_DIFFTIME : ?C: This symbol, if defined, indicates that the difftime routine is ?C: available. ?C:. +?C:USE_DIFFTIME : +?C: This symbol, if defined, indicates that the difftime routine should +?C: really be used to compare times. +?C:. ?H:#$d_difftime HAS_DIFFTIME /**/ +?H:#$use_difftime USE_DIFFTIME /**/ ?H:. -?LINT:set d_difftime +?LINT:set d_difftime use_difftime +?T:avoid_difftime : see if difftime exists -set difftime d_difftime -eval $inlibc +$cat >try.c <<EOC +#include <time.h> +int main(void) +{ + static double ret; + static time_t t0, t1; + ret = difftime(t1, t0) * 1.0; + return ret ? 0 : 1; +} +EOC +cyn=difftime +set d_difftime +eval $trylink + +@if USE_DIFFTIME || use_difftime +: see whether difftime should be used +case "$d_difftime" in +"$define") + $cat >try.c <<EOC +#include "static_assert.h" +#include <time.h> +int main(void) +{ +?X: If time_t is not a signed integer type, we cannot calculate properly +?X: with the raw values. Define USE_DIFFTIME when this does not compile. + STATIC_ASSERT((time_t) -1 < 0); + return 0; +} +EOC + cyn="whether difftime() can be avoided" + set avoid_difftime + eval $trylink + ;; +*) avoid_difftime="$define";; +esac +case "$avoid_difftime" in +"$define") val="$undef";; +*) val="$define";; +esac +set use_difftime +eval $setvar +@end |