Re: [boost] [utility] value_init workaround fixed [Re:value_init_test failure]

From: David Abrahams (dave_at_[hidden])
Date: 2007-12-10 14:47:57

on Mon Dec 10 2007, "Niels Dekker - mail address until 2008-12-31" <nd_mail_address_valid_until_2008-12-31-AT-xs4all.nl> wrote:

> David Abrahams wrote:
>>> I have just committed a fix for this bug to the trunk:
>>> http://svn.boost.org/trac/boost/changeset/41942
>>
>> Unfortunately, as
>> https://boost-consulting.com/trac/projects/boost/build/trunk shows,
>> that appears to have broken Boost.Python on Linux/GCC.
>
> Do you mean the failures at python/test/try.cpp ?  I have no clue how 
> those failures could possibly be caused by value_init.  Do you?
>
> https://boost-consulting.com/trac/projects/boost/build-details/trunk/795/python/17 
> says:
> File "newtest.py", line 7, in __main__
> Failed example:
>     from m2 import *
> Exception raised:
>     Traceback (most recent call last):
>       File "doctest.py", line 1212, in __run
>         compileflags, 1) in test.globs
>       File "<doctest __main__[1]>", line 1, in <module>
>         from m2 import *
>     ImportError: No module named m2
> [...]

Nope.  And they disappear in the next revision just as mysteriously.

>>> I recently added tests on these issues to value_init_test, and they
>>> caused a test failures on a majority of the test platforms, at
>>> http://beta.boost.org/development/tests/trunk/developer/utility_.html
>>
>> I guess maybe that explains the Boost.Python test failures?
>
> Most of the tests that I added to value_init_test actually tested the 
> compiler implementation of value-initialization.  (Except for the most 
> recently added test, changeset [41919], which tested copying 
> value_initialized<T> objects.)  It's still unclear to me how providing a 
> workaround to those compiler issues could cause Boost.Python test 
> failures...
>
> The good news: the value_init tests at beta.boost.org now have 
> "unexpected" passes for Sandia-gcc-64: 
> http://beta.boost.org/development/tests/trunk/developer/utility_.html  I 
> expect other platforms to go green on the value_init test soon...  :-)

Nifty :-)

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com