Re: boost [math] excessive warnings via [lexical_cast] from [date_time] (and others) for clang 3.4?

From: John Maddock (jz.maddock_at_[hidden])
Date: 2020-03-24 16:25:45

On 24/03/2020 13:58, Jeff Garland via Boost wrote:
> In the regression tables the following warnings are coming out of math
> config.  I'm trying to understand what this means given that 1) the tests
> compile and execute fine, 2) the deadline is up,  and 3) several of the
> cases are compiled in c++11 mode (is it pre conformance bc it's
> clang3.4?).  I've seen this warning in other places that include
> lexical_cast as well.  So sure I could go and define the macro to quiet
> this, but seems like that should be done closest to the source.  In other
> words maybe math should only tell us that in headers that have a real
> issue?  Or will this soon be a real issue?

Well it will be a real issue in a year from now when we being removing 
C++03 support - it may be that lexical_cast's dependencies have nothing 
that will actually break (but I would need to check that), or that as a 
temporary measure we could continue to support C++03 in selected 
sub-parts if there is real demand for it.

Question: will anyone care about clang-3.4 a year from now given that 
we're currently on clang-9 ?

John.

>
> ../boost/math/tools/config.hpp:42:9: warning: CAUTION: One or more
> C++11 features were found to be unavailable [-W#pragma-messages]
> ../boost/math/tools/config.hpp:43:9: warning: CAUTION: Compiling
> Boost.Math in pre-C++11 conformance modes is now deprecated and will
> be removed from March 2021. [-W#pragma-messages]
> ../boost/math/tools/config.hpp:44:9: warning: CAUTION: Define
> BOOST_MATH_DISABLE_DEPRECATED_03_WARNING to suppress this message.
> [-W#pragma-messages]
>
> Full examples
> https://www.boost.org/development/tests/develop/developer/date_time.html
> https://www.boost.org/development/tests/develop/output/teeks99-dkr-dc3-4-98-date_time-clang-linux-3-4~c++98-warnings.html#testc_local_adjustor
>
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