-# fdatasync.m4 serial 2
-dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
+# fdatasync.m4 serial 4
+dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_FDATASYNC],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
- AC_CHECK_FUNCS_ONCE([fdatasync])
- if test $ac_cv_func_fdatasync = no; then
- HAVE_FDATASYNC=0
- fi
- dnl MacOS X 10.7 has fdatasync but does not declare it.
+
+ 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 Mac OS 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
fi
])