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annotate m4/fflush.m4 @ 17433:161070f4cae7

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fflush, fseeko: port to musl cross-compiles * lib/fseeko.c (fseeko): Assume that fflushing stdin works if on some implementation that (1) is not known to be buggy, (2) claims conformance to POSIX.1-2008 or later, and (3) is being cross-compiled to so we can't easily check for lack of conformance. This is for cross-compiling to musl. Reported by Rich Felker in <http://lists.gnu.org/archive/html/bug-gnulib/2013-06/msg00043.html>. * m4/fclose.m4 (gl_FUNC_FCLOSE): * m4/fflush.m4 (gl_FUNC_FFLUSH): * m4/fseeko.m4 (gl_FUNC_FSEEKO): Adjust to above change. * m4/fflush.m4 (gl_FUNC_FFLUSH_STDIN): Set gl_cv_func_fflush_stdin to 'cross', not to 'no', when cross-compiling. AC_DEFINE FUNC_FFLUSH_STDIN to 1, 0, -1 if fflushing stdin is known to work, known not to work, or unknown.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 18 Jun 2013 13:07:00 -0700
parents e542fd46ad6f
children
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1 # fflush.m4 serial 15
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2
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3 # Copyright (C) 2007-2013 Free Software Foundation, Inc.
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4 # This file is free software; the Free Software Foundation
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5 # gives unlimited permission to copy and/or distribute it,
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6 # with or without modifications, as long as this notice is preserved.
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7
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8 dnl From Eric Blake
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9
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10 dnl Find out how to obey POSIX semantics of fflush(stdin) discarding
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11 dnl unread input on seekable streams, rather than C99 undefined semantics.
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12
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13 AC_DEFUN([gl_FUNC_FFLUSH],
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14 [
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15 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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16 gl_FUNC_FFLUSH_STDIN
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17 if test $gl_cv_func_fflush_stdin != yes; then
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18 REPLACE_FFLUSH=1
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19 fi
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20 ])
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21
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22 dnl Determine whether fflush works on input streams.
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23 dnl Sets gl_cv_func_fflush_stdin.
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24
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25 AC_DEFUN([gl_FUNC_FFLUSH_STDIN],
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26 [
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27 AC_CHECK_HEADERS_ONCE([unistd.h])
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28 AC_CACHE_CHECK([whether fflush works on input streams],
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29 [gl_cv_func_fflush_stdin],
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30 [echo hello world > conftest.txt
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31 AC_RUN_IFELSE([AC_LANG_PROGRAM(
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32 [[
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33 #include <stdio.h>
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34 #if HAVE_UNISTD_H
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35 # include <unistd.h>
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36 #else /* on Windows with MSVC */
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37 # include <io.h>
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38 #endif
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39 ]], [[FILE *f = fopen ("conftest.txt", "r");
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40 char buffer[10];
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41 int fd;
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42 int c;
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43 if (f == NULL)
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44 return 1;
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45 fd = fileno (f);
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46 if (fd < 0 || fread (buffer, 1, 5, f) != 5)
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47 return 2;
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48 /* For deterministic results, ensure f read a bigger buffer. */
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49 if (lseek (fd, 0, SEEK_CUR) == 5)
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50 return 3;
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51 /* POSIX requires fflush-fseek to set file offset of fd. This fails
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52 on BSD systems and on mingw. */
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53 if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
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54 return 4;
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55 if (lseek (fd, 0, SEEK_CUR) != 5)
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56 return 5;
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57 /* Verify behaviour of fflush after ungetc. See
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58 <http://www.opengroup.org/austin/aardvark/latest/xshbug3.txt> */
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59 /* Verify behaviour of fflush after a backup ungetc. This fails on
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60 mingw. */
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61 c = fgetc (f);
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62 ungetc (c, f);
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63 fflush (f);
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64 if (fgetc (f) != c)
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65 return 6;
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66 /* Verify behaviour of fflush after a non-backup ungetc. This fails
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67 on glibc 2.8 and on BSD systems. */
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68 c = fgetc (f);
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69 ungetc ('@', f);
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70 fflush (f);
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71 if (fgetc (f) != c)
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72 return 7;
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73 return 0;
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74 ]])], [gl_cv_func_fflush_stdin=yes], [gl_cv_func_fflush_stdin=no],
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75 [gl_cv_func_fflush_stdin=cross])
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76 rm conftest.txt
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77 ])
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78 case $gl_cv_func_fflush_stdin in
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79 yes) gl_func_fflush_stdin=1 ;;
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80 no) gl_func_fflush_stdin=0 ;;
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81 *) gl_func_fflush_stdin='(-1)' ;;
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82 esac
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83 AC_DEFINE_UNQUOTED([FUNC_FFLUSH_STDIN], [$gl_func_fflush_stdin],
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84 [Define to 1 if fflush is known to work on stdin as per POSIX.1-2008,
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85 0 if fflush is known to not work, -1 if unknown.])
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86 ])
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87
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88 # Prerequisites of lib/fflush.c.
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89 AC_DEFUN([gl_PREREQ_FFLUSH], [:])