[boost] [build] b2 help moving disjoint_sets

Subject: [boost] [build] b2 help moving disjoint_sets
From: James E. King III (jking_at_[hidden])
Date: 2019-04-26 19:06:36

I have merged disjoint_sets into boostorg/graph locally and submitted
a pull request for it (https://github.com/boostorg/graph/pull/169).
The build jobs are failing however, due to disjoint_sets already
existing and already having links:

https://ci.appveyor.com/project/jzmaddock/graph/builds/24131163/job/uguk1lir4yl7aaj3

b2 headers
Performing configuration checks

 - default address-model : 32-bit
 - default architecture : x86
 - symlinks supported : yes
error: Cannot create link boost\pending\detail\disjoint_sets.hpp to
libs\graph\include\boost\pending\detail\disjoint_sets.hpp.
error: Link previously defined to another file,
libs\disjoint_sets\include\boost\pending\detail\disjoint_sets.hpp.

Command exited with code 1

This happened for me locally when I did the work, so I removed it from
the superproject locally, and deleted disjoint_sets locally.

Any thoughts on how I can tell the build to ignore disjoint_sets so it
can install the headers from the new location and complete?  This is a
temporary situation until the superproject is updated, but the
superproject cannot be updated until the code is merged into graph,
and the builds are all failing so I cannot prove to the graph
maintainers that the pull request is viable.  The only way I can see
around this is to rename the disjoint_sets headers from pending and
into graph, and then fix up graph and graph_parallel, but my intention
was to just merge the header into graph, not to change the location of
delivered headers.  That said, getting something out of pending is
always a good thing.  Any other ideas?

Thanks,

Jim