[PATCH] build: Update configure.ac to support the latest automake.

[Chris Johns]

On 2/4/18 12:18 pm, Chris Johns wrote:
> On 1/4/18 2:02 pm, Chris Johns wrote:
>> On 1/4/18 1:58 pm, Joel Sherrill wrote:
>>> Great job! 
>>
>> Thanks. Simpler than I expected.
>>
> 
> Testing shows this change is not enough, more is needed to make this stuff work.
> 
> The error is:
> 
> config.status: error: in
> `/opt/work/chris/rtems/kernel/bsps/xilinx_zynq_zedboard/arm-rtems5/c/xilinx_zynq_zedboard/testsuites/samples':
> config.status: error: Something went wrong bootstrapping makefile fragments
>     for automatic dependency tracking.  Try re-running configure with the
>     '--disable-dependency-tracking' option to at least be able to build
>     the package (albeit without support for automatic dependency tracking).
> See `config.log' for more details
> 
> I cannot find too much about this and what is happening. I can see the
> `leaf.cfg` link is not being made and so I can only guess something related to
> `RTEMS_BSP_CONFIG_SUBDIR()` and `AC_CONFIG_SUBDIRS()` has changed which means
> the `leaf.cfg` is not being made before samples is being configured.
> 

I have managed to solve this issue with a hack but another more critical issue
has appeared related to the way the tests are structured and share code as
sources rather than a library. The `subdir-objects` breaks the testsuite when
building with a parallel build.

Chris