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annotate build-scripts/mkinstalldirs @ 2752:edd2839b36f7

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http://sources.redhat.com/ml/newlib/2002/msg00230.html Stephen L Moshier wrote: > > pow(x,y) returns 0 when x is very close to -1.0 and y is very large. > The following test program prints > > pow(1.0000000000000002e+00 4.5035996273704970e+15) = 2.7182818284590455e+00 > pow(-1.0000000000000002e+00 4.5035996273704970e+15) =0.0000000000000000e+00 > pow(9.9999999999999978e-01 4.5035996273704970e+15) = 3.6787944117144222e-01 > pow(-9.9999999999999978e-01 4.5035996273704970e+15) = 0.0000000000000000e+00 > > which is incorrect for the negative arguments raised to an odd integer > power. > > ----- > double pow (double, double); > > int > main () > { > double x, y, z; > > x = 1.0 + pow (2.0, -52.0); > y = 1.0 + pow (2.0, 52.0); > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = -x; > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = 1.0 - pow (2.0, -52.0); > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = -x; > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > } > ----- > > Here is a patch for newlib/libm/math/epow.c: Patch checked in and duplicated for ef_pow.c. Thanks. -- Jeff J.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 15 Sep 2008 04:31:30 +0000
parents 19418e4422cb
children
rev   line source
1361
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1 #! /bin/sh
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2 # mkinstalldirs --- make directory hierarchy
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3 # Author: Noah Friedman <friedman@prep.ai.mit.edu>
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4 # Created: 1993-05-16
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5 # Public domain
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6
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7 errstatus=0
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8 dirmode=""
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9
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10 usage="\
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11 Usage: mkinstalldirs [-h] [--help] [-m mode] dir ..."
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12
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13 # process command line arguments
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14 while test $# -gt 0 ; do
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15 case "${1}" in
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16 -h | --help | --h* ) # -h for help
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17 echo "${usage}" 1>&2; exit 0 ;;
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18 -m ) # -m PERM arg
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19 shift
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20 test $# -eq 0 && { echo "${usage}" 1>&2; exit 1; }
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21 dirmode="${1}"
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22 shift ;;
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23 -- ) shift; break ;; # stop option processing
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24 -* ) echo "${usage}" 1>&2; exit 1 ;; # unknown option
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25 * ) break ;; # first non-opt arg
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26 esac
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27 done
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28
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29 for file
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30 do
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31 if test -d "$file"; then
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32 shift
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33 else
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34 break
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35 fi
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36 done
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37
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38 case $# in
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39 0) exit 0 ;;
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40 esac
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41
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42 case $dirmode in
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43 '')
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44 if mkdir -p -- . 2>/dev/null; then
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45 echo "mkdir -p -- $*"
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46 exec mkdir -p -- "$@"
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47 fi ;;
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48 *)
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49 if mkdir -m "$dirmode" -p -- . 2>/dev/null; then
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50 echo "mkdir -m $dirmode -p -- $*"
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51 exec mkdir -m "$dirmode" -p -- "$@"
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52 fi ;;
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53 esac
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54
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55 for file
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56 do
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57 set fnord `echo ":$file" | sed -ne 's/^:\//#/;s/^://;s/\// /g;s/^#/\//;p'`
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58 shift
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59
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60 pathcomp=
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61 for d
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62 do
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63 pathcomp="$pathcomp$d"
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64 case "$pathcomp" in
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65 -* ) pathcomp=./$pathcomp ;;
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66 esac
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67
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68 if test ! -d "$pathcomp"; then
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69 echo "mkdir $pathcomp"
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70
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71 mkdir "$pathcomp" || lasterr=$?
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72
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73 if test ! -d "$pathcomp"; then
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74 errstatus=$lasterr
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75 else
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76 if test ! -z "$dirmode"; then
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77 echo "chmod $dirmode $pathcomp"
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78
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79 lasterr=""
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80 chmod "$dirmode" "$pathcomp" || lasterr=$?
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81
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82 if test ! -z "$lasterr"; then
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83 errstatus=$lasterr
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84 fi
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85 fi
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86 fi
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87 fi
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88
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89 pathcomp="$pathcomp/"
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90 done
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91 done
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92
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93 exit $errstatus
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94
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95 # Local Variables:
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96 # mode: shell-script
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97 # sh-indentation: 3
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98 # End:
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99 # mkinstalldirs ends here