m4/fdatasync.m4

   1 # fdatasync.m4 serial 4
   2 dnl Copyright (C) 2008-2014 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 AC_DEFUN([gl_FUNC_FDATASYNC],
   8 [
   9   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  10
  11   dnl Using AC_CHECK_FUNCS_ONCE would break our subsequent AC_SEARCH_LIBS
  12   AC_CHECK_DECLS_ONCE([fdatasync])
  13   LIB_FDATASYNC=
  14   AC_SUBST([LIB_FDATASYNC])
  15
  16   if test $ac_cv_have_decl_fdatasync = no; then
  17     HAVE_DECL_FDATASYNC=0
  18     dnl Mac OS X 10.7 has fdatasync but does not declare it.
  19     AC_CHECK_FUNCS([fdatasync])
  20     if test $ac_cv_func_fdatasync = no; then
  21       HAVE_FDATASYNC=0
  22     fi
  23   else
  24     dnl Solaris <= 2.6 has fdatasync() in libposix4.
  25     dnl Solaris 7..10 has it in librt.
  26     gl_saved_libs=$LIBS
  27     AC_SEARCH_LIBS([fdatasync], [rt posix4],
  28                    [test "$ac_cv_search_fdatasync" = "none required" ||
  29                     LIB_FDATASYNC=$ac_cv_search_fdatasync])
  30     LIBS=$gl_saved_libs
  31   fi
  32 ])