On 6/17/2015 12:01 AM, Gennadiy Rozental wrote:

Edward Diener <eldiener <at> tropicsoft.com> writes:

Look at predef-check and predef-require in the Boost predef library. It
is still a bit buggy but it is what you want.

I do not understand how to use these or what they are doing.

For now , what I need is rather simple. If toolset is gcc with version less
then equal to 4.6 add std=c++0x otherwise add std=c++11.

How would I express this using the rules you've mentioned?

At the top of your jamfile add:

import your-path-to-predef/predef/check/predef : require check : predef-require predef-check ;

In the requirements section of a rule invocation add:

[ predef-check "BOOST_COMP_GNUC > 0" "BOOST_COMP_GNUC <= 4.6" : : <cxxflags>-std=c++0x : <cxxflags>-std=c++11 ]