How to full expand variables in autoconf?

Question

In this example:

configure.ac: 
  ...
  AC_CONFIG_FILES([script1])
  AC_OUTPUT

script1.in: 
  #!/bin/bash
  ...
  config=@datadir@/blah

This @datadir@ is expanded to ${prefix}/share, is there any way to expand it to /usr/local/share?

Answer 1

See Automake manual section 9.1.

Answer 2

You can use adl_RECURSIVE_EVAL from the autoconf archive to fully expand paths.