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|---|
| 2304df62 |
1 | ?RCS: $Id: d_casti32.U,v 3.0 1993/08/18 12:05:47 ram Exp $ |
| 2 | ?RCS: |
| 3 | ?RCS: Copyright (c) 1991-1993, Raphael Manfredi |
| 4 | ?RCS: |
| 5 | ?RCS: You may redistribute only under the terms of the Artistic Licence, |
| 6 | ?RCS: as specified in the README file that comes with the distribution. |
| 7 | ?RCS: You may reuse parts of this distribution only within the terms of |
| 8 | ?RCS: that same Artistic Licence; a copy of which may be found at the root |
| 9 | ?RCS: of the source tree for dist 3.0. |
| 10 | ?RCS: |
| 11 | ?RCS: $Log: d_casti32.U,v $ |
| 12 | ?RCS: Revision 3.0 1993/08/18 12:05:47 ram |
| 13 | ?RCS: Baseline for dist 3.0 netwide release. |
| 14 | ?RCS: |
| 15 | ?X: |
| 16 | ?X: Can the compiler cast large floats to 32-bit integers? |
| 17 | ?X: |
| 85e6fe83 |
18 | ?MAKE:d_casti32: cat cc ccflags rm intsize Setvar test |
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19 | ?MAKE: -pick add $@ %< |
| 20 | ?S:d_casti32: |
| 21 | ?S: This variable conditionally defines CASTI32, which indicates |
| 22 | ?S: wether the C compiler can cast large floats to 32-bit ints. |
| 23 | ?S:. |
| 24 | ?T:xxx yyy |
| 25 | ?C:CASTI32: |
| 26 | ?C: This symbol is defined if the C compiler can cast negative |
| 27 | ?C: or large floating point numbers to 32-bit ints. |
| 28 | ?C:. |
| 29 | ?H:#$d_casti32 CASTI32 /**/ |
| 30 | ?H:. |
| 31 | ?LINT:set d_casti32 |
| 32 | : check for ability to cast large floats to 32-bit ints. |
| 33 | echo " " |
| 34 | echo 'Checking whether your C compiler can cast large floats to int32.' >&4 |
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35 | if $test "$intsize" -eq 4; then |
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36 | xxx=int |
| 37 | else |
| 38 | xxx=long |
| 39 | fi |
| 40 | |
| 41 | $cat >try.c <<EOCP |
| 42 | #include <sys/types.h> |
| 43 | #include <signal.h> |
| 44 | blech() { exit(3); } |
| 45 | main() |
| 46 | { |
| 47 | $xxx i32; |
| 48 | double f; |
| 49 | int result = 0; |
| 50 | signal(SIGFPE, blech); |
| 51 | |
| 52 | f = (double) 0x7fffffff; |
| 53 | f = 10 * f; |
| 54 | i32 = ( $xxx )f; |
| 55 | |
| 56 | if (i32 != ( $xxx )f) |
| 57 | result |= 1; |
| 58 | exit(result); |
| 59 | } |
| 60 | EOCP |
| 61 | if $cc -o try $ccflags try.c >/dev/null 2>&1; then |
| 62 | ./try |
| 63 | yyy=$? |
| 64 | else |
| 65 | yyy=1 |
| 66 | fi |
| 67 | case "$yyy" in |
| 68 | 0) val="$define" |
| 69 | echo "Yup, it can." |
| 70 | ;; |
| 71 | *) val="$undef" |
| 72 | echo "Nope, it can't." |
| 73 | ;; |
| 74 | esac |
| 75 | set d_casti32 |
| 76 | eval $setvar |
| 85e6fe83 |
77 | $rm -f try try.* |
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