[boost] warning: non-free usage requirements <threading>multi ignored

Subject: [boost] warning: non-free usage requirements <threading>multi ignored
From: blubee blubeeme (gurenchan_at_[hidden])
Date: 2018-10-25 07:13:23

Hello

I am trying to build boost from git clone I run bootstrap.sh with these
flags
```shell
./bootstrap.sh \
--prefix=/usr/local         \
--with-toolset=clang                 \
--with-icu=/usr/local \
--with-python=python27         \
```
After boostrapping I append
```shell
"using mpi ;" >> ./project-config.jam
```

There's two issues with that
1)icu isn't found even though icu headers are in /usr/local/unicode/
2)I get this this warning
```error
warning: non-free usage requirements <threading>multi ignored
warning: in main-target boost_mpi_python at libs/mpi/build/Jamfile.v2:144
```
Which I tracked down to this issue:
http://boost.2283326.n4.nabble.com/explicitly-specified-values-of-non-free-feature-lt-threading-gt-conflict-td4701191.html

That thread leaves the issue unresolved and just throws a warning instead
of failing.
```shell
./bjam \
--prefix=/usr/local         \
--layout=system \
-d4                 \
--toolset=clang                         \
--build-dir=./build                 \
--stagedir=/opt/boost \
-j4                                 \
include=/usr/local/include/unicode \
link=shared         \
threading=multi \
stage         \
```

bjam output
```shell
Performing configuration checks

    - default address-model    : 64-bit
    - default architecture     : x86
    - symlinks supported       : yes
    - C++11 mutex              : yes
    - lockfree boost::atomic_flag : no
    - Boost.Config Feature Check: cxx11_auto_declarations : yes
    - Boost.Config Feature Check: cxx11_constexpr : yes
    - Boost.Config Feature Check: cxx11_defaulted_functions : yes
    - Boost.Config Feature Check: cxx11_final : yes
    - Boost.Config Feature Check: cxx11_hdr_mutex : yes
    - Boost.Config Feature Check: cxx11_hdr_tuple : yes
    - Boost.Config Feature Check: cxx11_lambdas : yes
    - Boost.Config Feature Check: cxx11_noexcept : yes
    - Boost.Config Feature Check: cxx11_nullptr : yes
    - Boost.Config Feature Check: cxx11_rvalue_references : yes
    - Boost.Config Feature Check: cxx11_template_aliases : yes
    - Boost.Config Feature Check: cxx11_thread_local : yes
    - Boost.Config Feature Check: cxx11_variadic_templates : yes
    - has_icu builds           : yes
warning: non-free usage requirements <threading>multi ignored
warning: in main-target mpi at project-config.jam:42
warning: non-free usage requirements <threading>multi ignored
warning: in main-target boost_mpi at libs/mpi/build/Jamfile.v2:119
    - zlib                     : yes
    - bzip2                    : yes
    - lzma                     : yes
    - zstd                     : no
    - iconv (libc)             : yes
    - icu                      : no
    - icu (lib64)              : no
    - xlocale supported        : yes
    - native-atomic-int32-supported : yes
    - native-syslog-supported  : yes
    - pthread-supports-robust-mutexes : yes
    - compiler-supports-ssse3  : yes
    - compiler-supports-avx2   : yes
    - gcc visibility           : yes
    - long double support      : no
warning: non-free usage requirements <threading>multi ignored
warning: in main-target boost_mpi_python at libs/mpi/build/Jamfile.v2:144
    - libbacktrace builds      : no
    - addr2line builds         : yes
    - WinDbg builds            : no
    - WinDbgCached builds      : no
    - BOOST_COMP_GNUC >= 4.3.0 : no

Component configuration:

    - atomic                   : building
    - chrono                   : building
    - container                : building
    - context                  : building
    - contract                 : building
    - coroutine                : building
    - date_time                : building
    - exception                : building
    - fiber                    : building
    - filesystem               : building
    - graph                    : building
    - graph_parallel           : building
    - iostreams                : building
    - locale                   : building
    - log                      : building
    - math                     : building
    - mpi                      : building
    - program_options          : building
    - python                   : building
    - random                   : building
    - regex                    : building
    - serialization            : building
    - stacktrace               : building
    - system                   : building
    - test                     : building
    - thread                   : building
    - timer                    : building
    - type_erasure             : building
    - wave                     : building
```

I do have a working installation of openmpi installed in /usr/local and
mpicxx is in my path from following the directions here:
https://www.boost.org/doc/libs/1_64_0/doc/html/mpi/getting_started.html#mpi.config

in the end the build errors out
```shell
0.003049 sec system; 0.000000 sec user; 3.078255 sec clock
Using shell: /bin/sh -c
    argv[0] = '/bin/sh'
    argv[1] = '-c'
    argv[2] = '
    ln -f -s 'libboost_wave.so.1.69.0'
'/wrkdirs/usr/ports/devel/boost-devel/work/stage/lib/libboost_wave.so'
'
ln-UNIX /wrkdirs/usr/ports/devel/boost-devel/work/stage/lib/libboost_wave.so

    ln -f -s 'libboost_wave.so.1.69.0'
'/wrkdirs/usr/ports/devel/boost-devel/work/stage/lib/libboost_wave.so'

0.001905 sec system; 0.000000 sec user; 1.957884 sec clock
...failed updating 86 targets...
...skipped 17 targets...
...updated 1147 targets...
*** [do-build] Error code 1

make: stopped in /usr/ports/devel/boost-devel
1 error
```

two questions:
1) How do I solve the non-free usage requirements warning
2) Why isn't icu being picked up?

github issue:: https://github.com/boostorg/boost/issues/210