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?RCS: $Id: d_casti32.U,v 3.0 1993/08/18 12:05:47 ram Exp $
?RCS:
?RCS: Copyright (c) 1991-1993, Raphael Manfredi
?RCS:
?RCS: You may redistribute only under the terms of the Artistic Licence,
?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: of the source tree for dist 3.0.
?RCS:
?RCS: $Log: d_casti32.U,v $
?RCS: Revision 3.0 1993/08/18 12:05:47 ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?X:
?X: Can the compiler cast large floats to 32-bit integers?
?X:
?MAKE:d_casti32: cat cc ccflags rm intsize Setvar test
?MAKE: -pick add $@ %<
?S:d_casti32:
?S: This variable conditionally defines CASTI32, which indicates
?S: wether the C compiler can cast large floats to 32-bit ints.
?S:.
?T:xxx yyy
?C:CASTI32:
?C: This symbol is defined if the C compiler can cast negative
?C: or large floating point numbers to 32-bit ints.
?C:.
?H:#$d_casti32 CASTI32 /**/
?H:.
?LINT:set d_casti32
: check for ability to cast large floats to 32-bit ints.
echo " "
echo 'Checking whether your C compiler can cast large floats to int32.' >&4
if $test "$intsize" -eq 4; then
xxx=int
else
xxx=long
fi
$cat >try.c <<EOCP
#include <sys/types.h>
#include <signal.h>
blech() { exit(3); }
main()
{
$xxx i32;
double f;
int result = 0;
signal(SIGFPE, blech);
f = (double) 0x7fffffff;
f = 10 * f;
i32 = ( $xxx )f;
if (i32 != ( $xxx )f)
result |= 1;
exit(result);
}
EOCP
if $cc -o try $ccflags try.c >/dev/null 2>&1; then
./try
yyy=$?
else
yyy=1
fi
case "$yyy" in
0) val="$define"
echo "Yup, it can."
;;
*) val="$undef"
echo "Nope, it can't."
;;
esac
set d_casti32
eval $setvar
$rm -f try try.*
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