| 1 | # strerror.m4 serial 16
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| 2 | dnl Copyright (C) 2002, 2007-2012 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 |
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| 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 |
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| 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 | ])
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