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annotate m4/fseeko.m4 @ 17252:7a29ec33d6c5

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author Karl Berry <karl@freefriends.org>
date Tue, 01 Jan 2013 09:17:08 -0800
parents e542fd46ad6f
children 161070f4cae7
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1 # fseeko.m4 serial 16
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2 dnl Copyright (C) 2007-2013 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_FSEEKO],
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8 [
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9 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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10 AC_REQUIRE([gl_STDIN_LARGE_OFFSET])
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11 AC_REQUIRE([gl_SYS_TYPES_H])
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12 AC_REQUIRE([AC_PROG_CC])
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13
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14 dnl Persuade glibc <stdio.h> to declare fseeko().
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15 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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16
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17 AC_CACHE_CHECK([for fseeko], [gl_cv_func_fseeko],
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18 [
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19 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
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20 ]], [fseeko (stdin, 0, 0);])],
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21 [gl_cv_func_fseeko=yes], [gl_cv_func_fseeko=no])
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22 ])
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23
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24 AC_CHECK_DECLS_ONCE([fseeko])
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25 if test $ac_cv_have_decl_fseeko = no; then
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26 HAVE_DECL_FSEEKO=0
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27 fi
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28
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29 if test $gl_cv_func_fseeko = no; then
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30 HAVE_FSEEKO=0
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31 else
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32 if test $WINDOWS_64_BIT_OFF_T = 1; then
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33 REPLACE_FSEEKO=1
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34 fi
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35 if test $gl_cv_var_stdin_large_offset = no; then
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36 REPLACE_FSEEKO=1
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37 fi
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38 m4_ifdef([gl_FUNC_FFLUSH_STDIN], [
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39 gl_FUNC_FFLUSH_STDIN
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40 if test $gl_cv_func_fflush_stdin = no; then
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41 REPLACE_FSEEKO=1
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42 fi
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43 ])
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44 fi
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45 ])
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46
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Paul Eggert <eggert@cs.ucla.edu>
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47 dnl Code shared by fseeko and ftello. Determine if large files are supported,
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48 dnl but stdin does not start as a large file by default.
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49 AC_DEFUN([gl_STDIN_LARGE_OFFSET],
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50 [
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51 AC_CACHE_CHECK([whether stdin defaults to large file offsets],
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52 [gl_cv_var_stdin_large_offset],
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53 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
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54 [[#if defined __SL64 && defined __SCLE /* cygwin */
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55 /* Cygwin 1.5.24 and earlier fail to put stdin in 64-bit mode, making
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56 fseeko/ftello needlessly fail. This bug was fixed in 1.5.25, and
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57 it is easier to do a version check than building a runtime test. */
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58 # include <cygwin/version.h>
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59 # if CYGWIN_VERSION_DLL_COMBINED < CYGWIN_VERSION_DLL_MAKE_COMBINED (1005, 25)
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60 choke me
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61 # endif
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62 #endif]])],
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63 [gl_cv_var_stdin_large_offset=yes],
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64 [gl_cv_var_stdin_large_offset=no])])
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65 ])
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66
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67 # Prerequisites of lib/fseeko.c.
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68 AC_DEFUN([gl_PREREQ_FSEEKO],
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69 [
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70 dnl Native Windows has the function _fseeki64. mingw hides it, but mingw64
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71 dnl makes it usable again.
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72 AC_CHECK_FUNCS([_fseeki64])
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73 ])