+
+ dnl Using AC_CHECK_FUNCS_ONCE would break our subsequent AC_SEARCH_LIBS
+ AC_CHECK_DECLS_ONCE([fdatasync])
+ LIB_FDATASYNC=
+ AC_SUBST([LIB_FDATASYNC])
+
+ if test $ac_cv_have_decl_fdatasync = no; then
+ HAVE_DECL_FDATASYNC=0
+ dnl MacOS X 10.7 has fdatasync but does not declare it.
+ AC_CHECK_FUNCS([fdatasync])
+ if test $ac_cv_func_fdatasync = no; then
+ HAVE_FDATASYNC=0
+ fi
+ else
+ dnl Solaris <= 2.6 has fdatasync() in libposix4.
+ dnl Solaris 7..10 has it in librt.
+ gl_saved_libs=$LIBS
+ AC_SEARCH_LIBS([fdatasync], [rt posix4],
+ [test "$ac_cv_search_fdatasync" = "none required" ||
+ LIB_FDATASYNC=$ac_cv_search_fdatasync])
+ LIBS=$gl_saved_libs