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annotate m4/fdatasync.m4 @ 40132:6bcaf5dcb02b

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fdatasync: Fix compilation error on Android 4.3. * m4/fdatasync.m4 (gl_FUNC_FDATASYNC): On platforms other than Solaris, test whether fdatasync() exists.
author Bruno Haible <bruno@clisp.org>
date Fri, 25 Jan 2019 00:15:50 +0100
parents b06060465f09
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # fdatasync.m4 serial 5
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Paul Eggert <eggert@cs.ucla.edu>
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2 dnl Copyright (C) 2008-2019 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_FDATASYNC],
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8 [
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9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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10 AC_REQUIRE([AC_CANONICAL_HOST])
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11
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12 dnl Using AC_CHECK_FUNCS_ONCE would break our subsequent AC_SEARCH_LIBS
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13 AC_CHECK_DECLS_ONCE([fdatasync])
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14 LIB_FDATASYNC=
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15 AC_SUBST([LIB_FDATASYNC])
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16
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17 if test $ac_cv_have_decl_fdatasync = no; then
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18 HAVE_DECL_FDATASYNC=0
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19 dnl Mac OS X 10.7 has fdatasync but does not declare it.
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20 AC_CHECK_FUNCS([fdatasync])
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21 if test $ac_cv_func_fdatasync = no; then
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22 HAVE_FDATASYNC=0
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23 fi
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24 else
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25 case "$host_os" in
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26 solaris*)
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27 dnl Solaris <= 2.6 has fdatasync() in libposix4.
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28 dnl Solaris 7..10 has it in librt.
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29 gl_saved_libs=$LIBS
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30 AC_SEARCH_LIBS([fdatasync], [rt posix4],
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31 [test "$ac_cv_search_fdatasync" = "none required" ||
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32 LIB_FDATASYNC=$ac_cv_search_fdatasync])
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33 LIBS=$gl_saved_libs
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34 ;;
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35 *)
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36 dnl Android 4.3 does not have fdatasync but declares it.
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37 AC_CHECK_FUNCS([fdatasync])
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38 if test $ac_cv_func_fdatasync = no; then
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39 HAVE_FDATASYNC=0
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40 fi
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41 ;;
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42 esac
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43 fi
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44 ])