Embarcadero PRs

From: Edward Diener (eldiener_at_[hidden])
Date: 2020-05-20 01:05:03

I have PRs for these libraries, which have passed CI testing, for 
distinguishing the Embarcadero C++ clang-based compilers from the legacy 
bcc32 compiler:

beast
thread
regex
container
python
program_options
units
circular_buffer
graph
parameter
unordered
random
typeof

Can the maintainers of these libraries please merge the appropriate PR ? 
The PR should not affect any other compiler, and it gives a chance for 
the Embarcadero C++ clang-based compiler(s) to use the appropriate Boost 
library even when some lacking feature or Embarcadero bug currently 
prevents the full functionality of the library to be used.