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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # open.m4 serial 15
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2 dnl Copyright (C) 2007-2019 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_OPEN],
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8 [
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9 AC_REQUIRE([AC_CANONICAL_HOST])
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10 AC_REQUIRE([gl_PREPROC_O_CLOEXEC])
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11 case "$host_os" in
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12 mingw* | pw*)
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13 REPLACE_OPEN=1
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14 ;;
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15 *)
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16 dnl open("foo/") should not create a file when the file name has a
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17 dnl trailing slash. FreeBSD only has the problem on symlinks.
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18 AC_CHECK_FUNCS_ONCE([lstat])
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19 if test "$gl_cv_macro_O_CLOEXEC" != yes; then
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20 REPLACE_OPEN=1
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21 fi
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22 AC_CACHE_CHECK([whether open recognizes a trailing slash],
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23 [gl_cv_func_open_slash],
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24 [# Assume that if we have lstat, we can also check symlinks.
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25 if test $ac_cv_func_lstat = yes; then
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26 touch conftest.tmp
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27 ln -s conftest.tmp conftest.lnk
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28 fi
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29 AC_RUN_IFELSE(
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30 [AC_LANG_SOURCE([[
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31 #include <fcntl.h>
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32 #if HAVE_UNISTD_H
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33 # include <unistd.h>
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34 #endif
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35 int main ()
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36 {
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37 int result = 0;
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38 #if HAVE_LSTAT
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39 if (open ("conftest.lnk/", O_RDONLY) != -1)
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40 result |= 1;
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41 #endif
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42 if (open ("conftest.sl/", O_CREAT, 0600) >= 0)
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43 result |= 2;
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44 return result;
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45 }]])],
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46 [gl_cv_func_open_slash=yes],
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47 [gl_cv_func_open_slash=no],
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48 [
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49 changequote(,)dnl
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50 case "$host_os" in
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51 freebsd* | aix* | hpux* | solaris2.[0-9] | solaris2.[0-9].*)
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52 gl_cv_func_open_slash="guessing no" ;;
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53 *)
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54 gl_cv_func_open_slash="guessing yes" ;;
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55 esac
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56 changequote([,])dnl
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57 ])
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58 rm -f conftest.sl conftest.tmp conftest.lnk
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59 ])
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60 case "$gl_cv_func_open_slash" in
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61 *no)
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62 AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
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63 [Define to 1 if open() fails to recognize a trailing slash.])
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64 REPLACE_OPEN=1
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65 ;;
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66 esac
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67 ;;
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68 esac
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69 dnl Replace open() for supporting the gnulib-defined fchdir() function,
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70 dnl to keep fchdir's bookkeeping up-to-date.
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71 m4_ifdef([gl_FUNC_FCHDIR], [
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72 if test $REPLACE_OPEN = 0; then
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73 gl_TEST_FCHDIR
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74 if test $HAVE_FCHDIR = 0; then
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75 REPLACE_OPEN=1
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76 fi
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77 fi
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78 ])
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79 dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.
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80 m4_ifdef([gl_NONBLOCKING_IO], [
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81 if test $REPLACE_OPEN = 0; then
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82 gl_NONBLOCKING_IO
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83 if test $gl_cv_have_open_O_NONBLOCK != yes; then
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84 REPLACE_OPEN=1
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85 fi
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86 fi
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87 ])
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88 ])
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89
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90 # Prerequisites of lib/open.c.
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91 AC_DEFUN([gl_PREREQ_OPEN],
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92 [
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93 AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
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94 :
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95 ])