Disabling io-ompio builds broken on master

[awlauria]

There seems to be a new dependency in fcoll on ompio.

Configuring with ---enable-mca-no-build=io-ompio,common-ompio,sharedfp,sharedfp,fbtl,fbtl,fcoll,fcoll,fs will fail to build with:

undefined reference to `mca_common_ompio_set_aggregator_props'
../../../ompi/.libs/libmpi_ftw.so: undefined reference to `mca_common_ompio_decode_datatype'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:1484: ompi_info] Error 1
make[1]: *** [Makefile:2658: all-recursive] Error 1
make: *** [Makefile:1477: all-recursive] Error 1

I tracked it back to this commit: 1846e73

Looking at the code I am not sure what the best spot is to move them to, or how to properly refactor them out.

[edgargabriel]

@awlauria not sure what to do about this. Based on what you report it looks like the no-build=io-ompio also disables building the common/ompio directory, and this causes the problem? If yes, I think we need to fix this, common/ompio would still have to be build.

If one wants to disable/remove ompio completely, there is a separate flag (--disable-io-ompio) that was introduced by somebody from IBM (Josh, but I am not sure), and that is supposed to disable everything related to ompio, i.e.
io/compio
common/omio
fcoll ( all components and base)
fs ( all components and base)
fbtl ( all components and base)
sharedfp ( all components and base)

Note that all of the other frameworks (fs, fbtl, fcoll, sharedfp) have depedencies one way or another to common/ompio, so just disabling io/ompio should not do any good from that perspective.

[awlauria]

@edgargabriel I was wrong with my configure statement, I updated it.

I get similar results with --disable-io-ompio (though it is not clear to me that is still supported...)

I do notice that the fcoll/base directory is still built, which is causing the issue. Does this need to be explicitly disabled somehow? I would think including fcoll in the line would disable everything underneath, but for some reason base is still built while all others are not. I tried adding fcoll-base to the configure line without luck. Similar is happening with the fbtl.

[edgargabriel]

@awlauria I can have a look at it, but I am not a super-master of the ompi build logic, will see whether I find something

[awlauria]

I have a potential solution, will post a PR for you to review soon.