nexmon – Blame information for rev 1
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1 | office | 1 | # strerror.m4 serial 16 |
2 | dnl Copyright (C) 2002, 2007-2011 Free Software Foundation, Inc. |
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3 | dnl This file is free software; the Free Software Foundation |
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4 | dnl gives unlimited permission to copy and/or distribute it, |
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5 | dnl with or without modifications, as long as this notice is preserved. |
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6 | |||
7 | AC_DEFUN([gl_FUNC_STRERROR], |
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8 | [ |
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9 | AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) |
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10 | AC_REQUIRE([gl_HEADER_ERRNO_H]) |
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11 | AC_REQUIRE([gl_FUNC_STRERROR_0]) |
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12 | m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [ |
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13 | AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS]) |
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14 | ]) |
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15 | if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then |
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16 | AC_CACHE_CHECK([for working strerror function], |
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17 | [gl_cv_func_working_strerror], |
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18 | [AC_RUN_IFELSE( |
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19 | [AC_LANG_PROGRAM( |
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20 | [[#include <string.h> |
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21 | ]], |
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22 | [[if (!*strerror (-2)) return 1;]])], |
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23 | [gl_cv_func_working_strerror=yes], |
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24 | [gl_cv_func_working_strerror=no], |
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25 | [dnl Be pessimistic on cross-compiles for now. |
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26 | gl_cv_func_working_strerror="guessing no"]) |
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27 | ]) |
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28 | if test "$gl_cv_func_working_strerror" != yes; then |
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29 | dnl The system's strerror() fails to return a string for out-of-range |
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30 | dnl integers. Replace it. |
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31 | REPLACE_STRERROR=1 |
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32 | fi |
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33 | m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [ |
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34 | dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's |
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35 | dnl buffer, we must replace strerror. |
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36 | case "$gl_cv_func_strerror_r_works" in |
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37 | *no) REPLACE_STRERROR=1 ;; |
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38 | esac |
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39 | ]) |
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40 | else |
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41 | dnl The system's strerror() cannot know about the new errno values we add |
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42 | dnl to <errno.h>, or any fix for strerror(0). Replace it. |
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43 | REPLACE_STRERROR=1 |
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44 | fi |
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45 | ]) |
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46 | |||
47 | dnl Detect if strerror(0) passes (that is, does not set errno, and does not |
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48 | dnl return a string that matches strerror(-1)). |
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49 | AC_DEFUN([gl_FUNC_STRERROR_0], |
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50 | [ |
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51 | REPLACE_STRERROR_0=0 |
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52 | AC_CACHE_CHECK([whether strerror(0) succeeds], |
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53 | [gl_cv_func_strerror_0_works], |
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54 | [AC_RUN_IFELSE( |
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55 | [AC_LANG_PROGRAM( |
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56 | [[#include <string.h> |
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57 | #include <errno.h> |
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58 | ]], |
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59 | [[int result = 0; |
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60 | char *str; |
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61 | errno = 0; |
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62 | str = strerror (0); |
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63 | if (!*str) result |= 1; |
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64 | if (errno) result |= 2; |
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65 | if (strstr (str, "nknown") || strstr (str, "ndefined")) |
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66 | result |= 4; |
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67 | return result;]])], |
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68 | [gl_cv_func_strerror_0_works=yes], |
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69 | [gl_cv_func_strerror_0_works=no], |
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70 | [dnl Be pessimistic on cross-compiles for now. |
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71 | gl_cv_func_strerror_0_works="guessing no"]) |
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72 | ]) |
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73 | if test "$gl_cv_func_strerror_0_works" != yes; then |
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74 | REPLACE_STRERROR_0=1 |
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75 | AC_DEFINE([REPLACE_STRERROR_0], [1], [Define to 1 if strerror(0) |
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76 | does not return a message implying success.]) |
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77 | fi |
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78 | ]) |