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Re: Mandates explicit -std=c++XY for c++ projects




Am Dienstag, den 10.10.2017, 08:45 +0200 schrieb Mathieu Malaterre:

[...]
With this mind I'd like to make mandatory the -std=c++XY flags when
> compiling either a c++ library or a stand-alone c++ program:
>
> 1. Either upstream define the explicit -std=c++XY flags by mean of
> its build system,
> 2. Or the package maintainers needs to explicit change the CXXFLAGS
> to pass the appropriate version of the c++ standard. In which case
> this should be documented in the README.Debian file.

I don't think there is much to gain from it. Whenever there is a change
in the major version of gcc/g++ many bugs show up and all involved
really do a great job fixing these. IMHO switching from an older C++
standard to a newer one is no different. In fact, I think that this
forced change is an excellent incentive to review older packages.

> 3. As a fallback, dh should initialize the CXXFLAGS with -std=gnu++98

Why would you pick such an old standard as the default? Also note that
at least with boost there were instances where the ABI changed
depending on whether C++11 or higher was enabled or not. - Also for
that reason I think we should strife for all packages using the same
C++ standard, and this should be the default of the currently used C++
compiler. Forcing a lower standard on a package as a maintainer I would
consider only as a (temporal) workaround to fix RC bugs, and preferable
only for leaf packages.

Best,
Gert