In boost build, how to set compiler options conditionally?

Question

Is there a way (without modifying source files) to specify that I want to build boost with, say, msvc with one set of additional options in debug and another in release variants? In some config.jam or even better on command line? Like

using msvc : : <compileflags>-DRELEASE_DEFINES; - only if variant=release
using msvc : : <compileflags>-DDEBUG_DEFINES; - only if variant=debug
using msvc : : <compileflags>-DLL_SPECIFIC_STUFF; - only if link=shared

I was able to find a suggestion to use command line like variant=debug/somefeature=somevalue but that doesn't work.

Answer 1

Well, after some experimentation I was able to make it work through project-config.jam, here's a sample:

import option ;
import toolset ;

using msvc ;

toolset.flags msvc.compile CFLAGS <variant>release : "/GL /arch:SSE2 /fp:fast" : unchecked ;
toolset.flags msvc.compile CFLAGS <variant>debug : "/RTCc /RTC1 /GS" : unchecked ;
toolset.flags msvc.archive AROPTIONS <variant>release/<link>static : "/LTCG" : unchecked ;
toolset.flags msvc.link LINKFLAGS <variant>release/<link>shared : "/LTCG /OPT:REF /OPT:ICF" : unchecked ;
toolset.flags msvc.link LINKFLAGS <link>shared : "/PDB:c:\\Lib\\boost\\stage\\lib\\" : unchecked ;

option.set keep-going : false ;