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97 lines
3.2 KiB
Plaintext
97 lines
3.2 KiB
Plaintext
# strerror.m4 serial 17
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dnl Copyright (C) 2002, 2007-2013 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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