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1 # strerror.m4 serial 9
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2 dnl Copyright (C) 2002, 2007-2010 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_FUNC_STRERROR_SEPARATE])
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10 if test $REPLACE_STRERROR = 1; then
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11 AC_LIBOBJ([strerror])
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12 AC_DEFINE_UNQUOTED([REPLACE_STRERROR], [$REPLACE_STRERROR],
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13 [Define this to 1 if strerror is broken.])
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14 fi
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15 ])
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16
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17 # Like gl_FUNC_STRERROR, except prepare for separate compilation (no AC_LIBOBJ).
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18 AC_DEFUN([gl_FUNC_STRERROR_SEPARATE],
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19 [
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20 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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21 AC_REQUIRE([gl_HEADER_ERRNO_H])
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22 if test -z "$ERRNO_H"; then
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23 AC_CACHE_CHECK([for working strerror function],
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24 [gl_cv_func_working_strerror],
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25 [AC_RUN_IFELSE(
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26 [AC_LANG_PROGRAM(
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27 [[#include <string.h>
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28 ]],
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29 [[return !*strerror (-2);]])],
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30 [gl_cv_func_working_strerror=yes],
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31 [gl_cv_func_working_strerror=no],
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32 [dnl Assume crossbuild works if it compiles.
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33 AC_COMPILE_IFELSE(
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34 [AC_LANG_PROGRAM(
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35 [[#include <string.h>
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36 ]],
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37 [[return !*strerror (-2);]])],
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38 [gl_cv_func_working_strerror=yes],
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39 [gl_cv_func_working_strerror=no])
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40 ])
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41 ])
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42 if test $gl_cv_func_working_strerror = no; then
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43 dnl The system's strerror() fails to return a string for out-of-range
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44 dnl integers. Replace it.
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45 REPLACE_STRERROR=1
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46 fi
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47 else
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48 dnl The system's strerror() cannot know about the new errno values we add
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49 dnl to <errno.h>. Replace it.
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50 REPLACE_STRERROR=1
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51 fi
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52 if test $REPLACE_STRERROR = 1; then
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53 gl_PREREQ_STRERROR
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54 fi
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55 ])
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56
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57 # Prerequisites of lib/strerror.c.
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58 AC_DEFUN([gl_PREREQ_STRERROR], [
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59 AC_CHECK_DECLS([strerror])
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60 AC_CHECK_HEADERS_ONCE([sys/socket.h])
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61 if test $ac_cv_header_sys_socket_h != yes; then
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62 dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
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63 dnl the check for those headers unconditional; yet cygwin reports
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64 dnl that the headers are present but cannot be compiled (since on
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65 dnl cygwin, all socket information should come from sys/socket.h).
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66 AC_CHECK_HEADERS([winsock2.h])
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67 fi
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68 ])
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