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annotate m4/strerror.m4 @ 40196:e63f5d3edab5

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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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Samuel Thibault <samuel.thibault@gnu.org>
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1 # strerror.m4 serial 19
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Paul Eggert <eggert@cs.ucla.edu>
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2 dnl Copyright (C) 2002, 2007-2019 Free Software Foundation, Inc.
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87c42e194f4a Use an all-permissive copyright notice, recommended by RMS.
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3 dnl This file is free software; the Free Software Foundation
87c42e194f4a Use an all-permissive copyright notice, recommended by RMS.
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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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7c1a6b73f48e An autoconf macro for its associated module.
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6
7c1a6b73f48e An autoconf macro for its associated module.
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7 AC_DEFUN([gl_FUNC_STRERROR],
7c1a6b73f48e An autoconf macro for its associated module.
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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 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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13 m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
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14 AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
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15 ])
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16 if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
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17 AC_CACHE_CHECK([for working strerror function],
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18 [gl_cv_func_working_strerror],
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19 [AC_RUN_IFELSE(
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20 [AC_LANG_PROGRAM(
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21 [[#include <string.h>
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22 ]],
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23 [[if (!*strerror (-2)) return 1;]])],
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24 [gl_cv_func_working_strerror=yes],
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25 [gl_cv_func_working_strerror=no],
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26 [case "$host_os" in
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parents: 18993
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27 # Guess yes on glibc systems.
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28 *-gnu* | gnu*) gl_cv_func_working_strerror="guessing yes" ;;
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29 # If we don't know, assume the worst.
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30 *) gl_cv_func_working_strerror="guessing no" ;;
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31 esac
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32 ])
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33 ])
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34 case "$gl_cv_func_working_strerror" in
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35 *yes) ;;
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36 *)
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37 dnl The system's strerror() fails to return a string for out-of-range
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38 dnl integers. Replace it.
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39 REPLACE_STRERROR=1
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40 ;;
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41 esac
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42 m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
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43 dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's
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44 dnl buffer, we must replace strerror.
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45 case "$gl_cv_func_strerror_r_works" in
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46 *no) REPLACE_STRERROR=1 ;;
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47 esac
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48 ])
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49 else
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50 dnl The system's strerror() cannot know about the new errno values we add
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51 dnl to <errno.h>, or any fix for strerror(0). Replace it.
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52 REPLACE_STRERROR=1
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53 fi
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54 ])
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55
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56 dnl Detect if strerror(0) passes (that is, does not set errno, and does not
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57 dnl return a string that matches strerror(-1)).
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58 AC_DEFUN([gl_FUNC_STRERROR_0],
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59 [
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60 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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61 REPLACE_STRERROR_0=0
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62 AC_CACHE_CHECK([whether strerror(0) succeeds],
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63 [gl_cv_func_strerror_0_works],
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64 [AC_RUN_IFELSE(
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65 [AC_LANG_PROGRAM(
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66 [[#include <string.h>
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67 #include <errno.h>
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68 ]],
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69 [[int result = 0;
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70 char *str;
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71 errno = 0;
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72 str = strerror (0);
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73 if (!*str) result |= 1;
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74 if (errno) result |= 2;
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75 if (strstr (str, "nknown") || strstr (str, "ndefined"))
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76 result |= 4;
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77 return result;]])],
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78 [gl_cv_func_strerror_0_works=yes],
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79 [gl_cv_func_strerror_0_works=no],
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80 [case "$host_os" in
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81 # Guess yes on glibc systems.
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82 *-gnu* | gnu*) gl_cv_func_strerror_0_works="guessing yes" ;;
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83 # Guess yes on native Windows.
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84 mingw*) gl_cv_func_strerror_0_works="guessing yes" ;;
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85 # If we don't know, assume the worst.
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86 *) gl_cv_func_strerror_0_works="guessing no" ;;
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87 esac
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88 ])
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89 ])
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90 case "$gl_cv_func_strerror_0_works" in
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91 *yes) ;;
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92 *)
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93 REPLACE_STRERROR_0=1
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94 AC_DEFINE([REPLACE_STRERROR_0], [1], [Define to 1 if strerror(0)
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95 does not return a message implying success.])
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96 ;;
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97 esac
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98 ])