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Annotation of embedaddon/libiconv/srcm4/strerror.m4, revision 1.1.1.2

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