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

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

?RCS: Copyright (c) 2000,2014 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_fpclassify d_fp_classify: Inlibc cat i_math Compile rm_try Setvar
?MAKE:	-pick add $@ %<
?X:the short story is that C99 says use fpclassify.  But the story is confused
?X:by systems "partially C99" (or fully "pre C99") which either user fpclassify
?X:but with different return values, or they use fp_classify (with the expected)
?X:return values, or they use some other spelling of *fp*class* (sometimes even
?X:without the *fp* part), with yet another set(s) of return values ...
?S:d_fpclassify:
?S:	This variable conditionally defines the HAS_FPCLASSIFY symbol, which
?S:	indicates to the C program that the fpclassify() routine is available.
?S:.
?S:d_fp_classify:
?S:	This variable conditionally defines the HAS_FP_CLASSIFY symbol, which
?S:	indicates to the C program that the fp_classify() routine is available.
?S:.
?C:HAS_FPCLASSIFY:
?C:	This symbol, if defined, indicates that the fpclassify routine is
?C:	available to classify doubles.  Available for example in HP-UX.
?C:	The returned values are defined in <math.h> and are
?C:
?C:           FP_NORMAL     Normalized
?C:           FP_ZERO       Zero
?C:           FP_INFINITE   Infinity
?C:           FP_SUBNORMAL  Denormalized
?C:           FP_NAN        NaN
?C:
?C:.
?C:HAS_FP_CLASSIFY:
?C:	This symbol, if defined, indicates that the fp_classify routine is
?C:	available to classify doubles. The values are defined in <math.h>
?C:
?C:           FP_NORMAL     Normalized
?C:           FP_ZERO       Zero
?C:           FP_INFINITE   Infinity
?C:           FP_SUBNORMAL  Denormalized
?C:           FP_NAN        NaN
?C:
?C:.
?H:#$d_fpclassify	HAS_FPCLASSIFY		/**/
?H:#$d_fp_classify	HAS_FP_CLASSIFY		/**/
?H:.
?LINT:set d_fpclassify
?LINT:set d_fp_classify
: check for fpclassify
?X:classified (Comment by jhi)
?X:fpclassify	i_math
?X:fp_classify	i_math
?X:fpclass	i_math i_ieeefp i_fp
?X:fp_class	i_math i_fp_class
?X:		No i_fp_class yet. But the systems that have
?X:		this (Tru64 and IRIX) both had <fp_class.h>
?X:class	i_math
echo "Checking to see if you have fpclassify..." >&4
$cat >try.c <<EOCP
#$i_math I_MATH
#ifdef I_MATH
#include <math.h>
#endif
int main() { return fpclassify(1.0) == FP_NORMAL ? 0 : 1; }
EOCP
set try
if eval $compile; then
	val="$define"
	echo "You have fpclassify."
else
	val="$undef"
	echo "You do not have fpclassify."
fi
$rm_try
set d_fpclassify
eval $setvar

: see if fp_classify exists
set fp_classify d_fp_classify
eval $inlibc