69 lines
2.3 KiB
Text
69 lines
2.3 KiB
Text
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# strerror.m4 serial 9
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dnl Copyright (C) 2002, 2007-2010 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_FUNC_STRERROR_SEPARATE])
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if test $REPLACE_STRERROR = 1; then
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AC_LIBOBJ([strerror])
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AC_DEFINE_UNQUOTED([REPLACE_STRERROR], [$REPLACE_STRERROR],
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[Define this to 1 if strerror is broken.])
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fi
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])
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# Like gl_FUNC_STRERROR, except prepare for separate compilation (no AC_LIBOBJ).
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AC_DEFUN([gl_FUNC_STRERROR_SEPARATE],
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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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if test -z "$ERRNO_H"; 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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[[return !*strerror (-2);]])],
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[gl_cv_func_working_strerror=yes],
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[gl_cv_func_working_strerror=no],
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[dnl Assume crossbuild works if it compiles.
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <string.h>
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]],
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[[return !*strerror (-2);]])],
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[gl_cv_func_working_strerror=yes],
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[gl_cv_func_working_strerror=no])
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])
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])
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if test $gl_cv_func_working_strerror = no; then
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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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fi
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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>. Replace it.
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REPLACE_STRERROR=1
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fi
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if test $REPLACE_STRERROR = 1; then
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gl_PREREQ_STRERROR
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fi
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])
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# Prerequisites of lib/strerror.c.
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AC_DEFUN([gl_PREREQ_STRERROR], [
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AC_CHECK_DECLS([strerror])
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AC_CHECK_HEADERS_ONCE([sys/socket.h])
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if test $ac_cv_header_sys_socket_h != yes; then
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dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
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dnl the check for those headers unconditional; yet cygwin reports
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dnl that the headers are present but cannot be compiled (since on
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dnl cygwin, all socket information should come from sys/socket.h).
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AC_CHECK_HEADERS([winsock2.h])
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fi
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])
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