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annotate m4/symlinkat.m4 @ 40186:8964917f9574

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author Karl Berry <karl@freefriends.org>
date Mon, 18 Feb 2019 08:02:49 -0800
parents b06060465f09
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # serial 9
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2 # See if we need to provide symlinkat replacement.
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3
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4 dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
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5 dnl This file is free software; the Free Software Foundation
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6 dnl gives unlimited permission to copy and/or distribute it,
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7 dnl with or without modifications, as long as this notice is preserved.
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8
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9 # Written by Eric Blake.
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10
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11 AC_DEFUN([gl_FUNC_SYMLINKAT],
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12 [
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13 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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14 AC_REQUIRE([gl_FUNC_OPENAT])
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15 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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16 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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17 AC_CHECK_FUNCS_ONCE([symlinkat])
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18 if test $ac_cv_func_symlinkat = no; then
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19 HAVE_SYMLINKAT=0
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20 else
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21 AC_CACHE_CHECK([whether symlinkat handles trailing slash correctly],
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22 [gl_cv_func_symlinkat_works],
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23 [AC_RUN_IFELSE(
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24 [AC_LANG_PROGRAM(
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25 [[#include <fcntl.h>
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26 #include <unistd.h>
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27 ]],
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28 [[int result = 0;
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29 if (!symlinkat ("a", AT_FDCWD, "conftest.link/"))
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30 result |= 1;
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31 if (symlinkat ("conftest.f", AT_FDCWD, "conftest.lnk2"))
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32 result |= 2;
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33 else if (!symlinkat ("a", AT_FDCWD, "conftest.lnk2/"))
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34 result |= 4;
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35 return result;
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36 ]])],
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37 [gl_cv_func_symlinkat_works=yes],
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38 [gl_cv_func_symlinkat_works=no],
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39 [case "$host_os" in
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40 # Guess yes on Linux systems.
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41 linux-* | linux) gl_cv_func_symlinkat_works="guessing yes" ;;
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42 # Guess yes on glibc systems.
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43 *-gnu* | gnu*) gl_cv_func_symlinkat_works="guessing yes" ;;
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44 # If we don't know, assume the worst.
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45 *) gl_cv_func_symlinkat_works="guessing no" ;;
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46 esac
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47 ])
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48 rm -f conftest.f conftest.link conftest.lnk2])
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49 case "$gl_cv_func_symlinkat_works" in
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50 *yes) ;;
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51 *)
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52 REPLACE_SYMLINKAT=1
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53 ;;
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54 esac
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55 fi
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56 ])