Re: [Boost-build] Latest b2 on trunk always rerunning tests

Subject: Re: [Boost-build] Latest b2 on trunk always rerunning tests
From: Edward Diener (eldiener_at_[hidden])
Date: 2013-11-06 13:55:37

On 11/6/2013 12:26 PM, Steven Watanabe wrote:
> AMDG
>
> On 11/06/2013 09:02 AM, Edward Diener wrote:
>>
>> After getting the latest from 'trunk', with the backed out fix to
>> libs/jamfile.v2, the tests for the Boost libraries now work correctly
>> without being rerun every time.
>>
>> However I have moved my own non-Boost library into the 'trunk'
>> structure, using the new modular Boost structure and the symbolic link,
>> and with this library the tests are still always being rerun. The source
>> file dates are correct and not in the future. There is evidently some
>> other difference between this library and libraries already in Boost as
>> far as Boost Build is concerned but I do not know what it could be.
>>
>
> Boost.Build detects your library as being in the modular
> structure and creates a link to your headers inside
> the main boost/ directory.  The problem is with this target,
> which is why making everything depend on it forces everything
> to rebuild.  I have never tested what happens when mixing
> the new layout with the old.  When writing the scripts, I
> assumed that it was either one or the other.

The new layout simply creates:

boost/boost/mylib -> headers, this is a symbolic link ( see just below )
boost/boost/mylib/detail -> header details
boost/libs/mylib/doc
                  test
                  include/boost/mylib -> this is the actual headers
                  include/boost/mylib/detail

Why might this cause problems for Boost Build ? I am still running tests 
from the test directory, with its jamfile.v2 and using
'include <boost/mylib/someheader.hpp>' as usual.