fix .gitignore: only ignore 'perl' in root of repo, not U/perl subdir

[metaconfig.git] / U / perl / d_isnan.U

?RCS: $Id$
?RCS:
?RCS: Copyright (c) 2000 Jarkko Hietaniemi
?RCS:
?RCS: You may distribute under the terms of either the GNU General Public
?RCS: License or the Artistic License, as specified in the README file.
?RCS:
?MAKE:d_isnan: Inlibc cat i_math Compile rm_try Setvar
?MAKE:	-pick add $@ %<
?S:d_isnan:
?S:	This variable conditionally defines the HAS_ISNAN symbol, which
?S:	indicates to the C program that the isnan() routine is available.
?S:.
?C:HAS_ISNAN:
?C:	This symbol, if defined, indicates that the isnan routine is
?C:	available to check whether a double is a NaN.
?C:.
?H:#$d_isnan HAS_ISNAN		/**/
?H:.
?LINT:set d_isnan
: check for isnan
echo "Checking to see if you have isnan..." >&4
$cat >try.c <<EOCP
#$i_math I_MATH
#ifdef I_MATH
#include <math.h>
#endif
int main() { return isnan(0.0); }
EOCP
set try
if eval $compile; then
	val="$define"
	echo "You have isnan."
else
	val="$undef"
	echo "You do not have isnan."
fi
$rm_try
set d_isnan
eval $setvar