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annotate m4/fseeko.m4 @ 14910:6d0e0db0535e

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fseek: Respect rules for use of AC_LIBOBJ. * m4/fseeko.m4 (gl_FUNC_FSEEKO): Move gl_REPLACE_FSEEK invocation from here... * m4/fseek.m4 (gl_FUNC_FSEEK): ... to here.
author Bruno Haible <bruno@clisp.org>
date Sat, 07 May 2011 13:23:50 +0200
parents 6927d3a4e13a
children bd2854b5a2ef
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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14910
6d0e0db0535e fseek: Respect rules for use of AC_LIBOBJ.
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1 # fseeko.m4 serial 14
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2 dnl Copyright (C) 2007-2011 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_HAVE_FSEEKO])
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11 AC_REQUIRE([gl_STDIN_LARGE_OFFSET])
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12
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13 AC_CHECK_DECLS_ONCE([fseeko])
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14 if test $ac_cv_have_decl_fseeko = no; then
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15 HAVE_DECL_FSEEKO=0
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16 fi
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17
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18 if test $gl_cv_func_fseeko = no; then
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19 HAVE_FSEEKO=0
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20 else
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21 if test $gl_cv_var_stdin_large_offset = no; then
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22 REPLACE_FSEEKO=1
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23 fi
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24 m4_ifdef([gl_FUNC_FFLUSH_STDIN], [
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25 gl_FUNC_FFLUSH_STDIN
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26 if test $gl_cv_func_fflush_stdin = no; then
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27 REPLACE_FSEEKO=1
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28 fi
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29 ])
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30 fi
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31 ])
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32
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33 dnl Tests whether fseeko is available.
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34 dnl Result is gl_cv_func_fseeko.
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35 AC_DEFUN([gl_HAVE_FSEEKO],
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36 [
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37 AC_REQUIRE([AC_PROG_CC])
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38
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39 dnl Persuade glibc <stdio.h> to declare fseeko().
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40 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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41
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42 AC_CACHE_CHECK([for fseeko], [gl_cv_func_fseeko],
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43 [
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44 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
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45 ]], [fseeko (stdin, 0, 0);])],
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46 [gl_cv_func_fseeko=yes], [gl_cv_func_fseeko=no])
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47 ])
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48 ])
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49
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50 dnl Code shared by fseeko and ftello. Determine if large files are supported,
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51 dnl but stdin does not start as a large file by default.
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52 AC_DEFUN([gl_STDIN_LARGE_OFFSET],
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53 [
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54 AC_CACHE_CHECK([whether stdin defaults to large file offsets],
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55 [gl_cv_var_stdin_large_offset],
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56 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
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57 [[#if defined __SL64 && defined __SCLE /* cygwin */
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58 /* Cygwin 1.5.24 and earlier fail to put stdin in 64-bit mode, making
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59 fseeko/ftello needlessly fail. This bug was fixed in 1.5.25, and
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60 it is easier to do a version check than building a runtime test. */
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61 # include <cygwin/version.h>
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62 # if CYGWIN_VERSION_DLL_COMBINED < CYGWIN_VERSION_DLL_MAKE_COMBINED (1005, 25)
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63 choke me
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64 # endif
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65 #endif]])],
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66 [gl_cv_var_stdin_large_offset=yes],
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67 [gl_cv_var_stdin_large_offset=no])])
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68 ])