bcp does not copy or list concept_check as bimap dependency

Start with the bcp tool's dependency discovery and --list/copy entry points, then compare its result for bimap with boostdep --list-dependencies bimap. Trace the dependency from boost/bimap/detail/bimap_core.hpp to boost/concept_check.hpp and ensure both listing and output copying include concept_check. Re-run the reproduction commands and compile the simple bimap program to confirm the dependency is available.

Problem description

bcp neither copies (to the output-path) nor --lists concept_check dependency for bimap

Problem reproduction

1. cd $HOME
2. git clone https://github.com/boostorg/boost.git boost
3. cd boost
4. git checkout boost-1.86.0
5. git submodule update --init
6. ./bootstrap.sh
7. ./b2 tools/bcp
8. ./dist/bin/bcp --list bimap
9. Nothing from concept_check (only libs/bimap/include/boost/bimap/detail/concept_tags.hpp)
10. mkdir $HOME/boost_for_bimap
11. ./dist/bin/bcp bimap $HOME/boost_for_bimap
12. Try to compile simple C++ program using #include "boost/bimap/bimap.hpp providing following include directories to compiler (I used gcc 9.4.0 on Ubuntu 20.04 LTS but it should not matter):

• $HOME/boost_for_bimap
• $HOME/boost_for_bimap/libs/bimap/include

13. Observe compile error:

In file included from $HOME/boost_for_bimap/libs/bimap/include/boost/bimap/bimap.hpp:61,
from $HOME/<my_simple_program>.cpp:<line_number>,
$HOME/boost_for_bimap/libs/bimap/include/boost/bimap/detail/bimap_core.hpp:31:10: fatal error: boost/concept_check.hpp: No such file or directory
31 | #include <boost/concept_check.hpp>
| ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Inconsistency with boostdep

./dist/bin/boostdep --list-dependencies bimap

correctly outputs concept_check as first primary dependency:

Primary dependencies for bimap:

concept_check:
<boost/concept_check.hpp>
from <boost/bimap/detail/bimap_core.hpp>
from <boost/bimap/list_of.hpp>
from <boost/bimap/multiset_of.hpp>
from <boost/bimap/set_of.hpp>
from <boost/bimap/unconstrained_set_of.hpp>
from <boost/bimap/unordered_multiset_of.hpp>
from <boost/bimap/unordered_set_of.hpp>
from <boost/bimap/vector_of.hpp>