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96 lines
3.2 KiB
96 lines
3.2 KiB
# strerror.m4 serial 17 |
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dnl Copyright (C) 2002, 2007-2017 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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AC_DEFUN([gl_FUNC_STRERROR], |
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[ |
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AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) |
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AC_REQUIRE([gl_HEADER_ERRNO_H]) |
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AC_REQUIRE([gl_FUNC_STRERROR_0]) |
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
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m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [ |
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AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS]) |
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]) |
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if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then |
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AC_CACHE_CHECK([for working strerror function], |
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[gl_cv_func_working_strerror], |
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[AC_RUN_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[#include <string.h> |
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]], |
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[[if (!*strerror (-2)) return 1;]])], |
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[gl_cv_func_working_strerror=yes], |
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[gl_cv_func_working_strerror=no], |
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[case "$host_os" in |
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# Guess yes on glibc systems. |
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*-gnu*) gl_cv_func_working_strerror="guessing yes" ;; |
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# If we don't know, assume the worst. |
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*) gl_cv_func_working_strerror="guessing no" ;; |
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esac |
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]) |
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]) |
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case "$gl_cv_func_working_strerror" in |
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*yes) ;; |
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*) |
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dnl The system's strerror() fails to return a string for out-of-range |
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dnl integers. Replace it. |
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REPLACE_STRERROR=1 |
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;; |
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esac |
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m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [ |
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dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's |
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dnl buffer, we must replace strerror. |
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case "$gl_cv_func_strerror_r_works" in |
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*no) REPLACE_STRERROR=1 ;; |
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esac |
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]) |
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else |
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dnl The system's strerror() cannot know about the new errno values we add |
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dnl to <errno.h>, or any fix for strerror(0). Replace it. |
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REPLACE_STRERROR=1 |
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fi |
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]) |
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dnl Detect if strerror(0) passes (that is, does not set errno, and does not |
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dnl return a string that matches strerror(-1)). |
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AC_DEFUN([gl_FUNC_STRERROR_0], |
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[ |
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
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REPLACE_STRERROR_0=0 |
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AC_CACHE_CHECK([whether strerror(0) succeeds], |
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[gl_cv_func_strerror_0_works], |
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[AC_RUN_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[#include <string.h> |
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#include <errno.h> |
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]], |
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[[int result = 0; |
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char *str; |
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errno = 0; |
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str = strerror (0); |
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if (!*str) result |= 1; |
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if (errno) result |= 2; |
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if (strstr (str, "nknown") || strstr (str, "ndefined")) |
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result |= 4; |
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return result;]])], |
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[gl_cv_func_strerror_0_works=yes], |
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[gl_cv_func_strerror_0_works=no], |
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[case "$host_os" in |
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# Guess yes on glibc systems. |
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*-gnu*) gl_cv_func_strerror_0_works="guessing yes" ;; |
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# If we don't know, assume the worst. |
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*) gl_cv_func_strerror_0_works="guessing no" ;; |
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esac |
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]) |
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]) |
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case "$gl_cv_func_strerror_0_works" in |
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*yes) ;; |
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*) |
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REPLACE_STRERROR_0=1 |
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AC_DEFINE([REPLACE_STRERROR_0], [1], [Define to 1 if strerror(0) |
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does not return a message implying success.]) |
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;; |
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esac |
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])
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