Re: feature for C++ standards compliance

From: John Maddock (jz.maddock_at_[hidden])
Date: 2021-02-25 18:55:58

On 25/02/2021 18:33, Robert Ramey via Boost wrote:
> The serialization library is compatible with C++03 (and likely 98). 
> And is tested regularly with C++ compilers with the -std switch set to 
> this mode.  The recent changes to the math library have broken about 5 
> tests in the serialization library.  Since this breakage is in a few 
> tests only and not in the library itself, I'd like to suppress these 
> tests when the being tested with a C++03 compiler.  I've suppressed 
> tests which are conditional on C++ features which are not supported 
> and this has worked well for my purposes.  I'd like to do the same for 
> a couple of tests which are conditional on usage of the math library 
> and standards versions < C++11.  Any B2/CMake experts want to help an 
> old guy out?
>
There is no "only build this in C++X mode" for some value X, I was 
thinking about this the other day, and Boost.Config should probably add 
something that is the union of all our std-specific feature test macros 
that we could all use.

In the mean time, adding:

import ../../config/checks/config : requires ;

To the top of the Jamfile and then to each target's requires clause add:

 Â Â Â Â Â  [ requires cxx11_noexcept cxx11_rvalue_references sfinae_expr 
cxx11_auto_declarations cxx11_lambdas 
cxx11_unified_initialization_syntax cxx11_hdr_tuple 
cxx11_hdr_initializer_list cxx11_hdr_chrono cxx11_thread_local 
cxx11_constexpr cxx11_nullptr cxx11_numeric_limits cxx11_decltype 
cxx11_hdr_array cxx11_hdr_atomic cxx11_hdr_type_traits cxx11_allocator 
cxx11_explicit_conversion_operators ]

And yes, this is over-verbose.

I might see if I can file you a quick PR.

Best, John.

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