Re: [Boost-users] [cfe-dev] [llvm-dev] Error: ISO C++17 does not allow 'register' storage class specifier [-Wregister], when building Boost 1.69.0

Subject: Re: [Boost-users] [cfe-dev] [llvm-dev] Error: ISO C++17 does not allow 'register' storage class specifier [-Wregister], when building Boost 1.69.0
From: Matthieu Brucher (matthieu.brucher_at_[hidden])
Date: 2018-12-25 18:01:04

Python 2.7 will always have this issue. Python 3 may have fixed the issue,
but Python 3 is supported by Boost.Python for a long time now.

The question is which Python version you want to wrap. It seems that you
don't know the Python 2 and Python 3 are different products. You may not
even need to build these then.
If you are using Python 2, you don't have a choice, ou have to either fix
the headers or remove the error in another way.

Cheers,

Matthieu

Le mar. 25 déc. 2018 à 18:41, Osman Zakir via Boost-users <
boost-users_at_[hidden]> a écrit :

> I'll build using C++14 mode, then.  I wonder if Python 3.7.1 has this
> issue as well?  If it doesn't, then maybe Boost should switch over to that
> version of Python.
> ------------------------------
> *From:* Matthieu Brucher <matthieu.brucher_at_[hidden]>
> *Sent:* Tuesday, December 25, 2018 2:56 PM
> *To:* Oleg Smolsky
> *Cc:* Craig Topper; Osman Zakir; clang developer list;
> cfe-users_at_[hidden]; llvm-dev_at_[hidden]
> *Subject:* Re: [cfe-dev] [llvm-dev] Error: ISO C++17 does not allow
> 'register' storage class specifier [-Wregister], when building Boost 1.69.0
>
> The issue comes in part form the Python headers that have the keyword.
> Unfortunately, this also means that there is an issue while building user
> code. But it's not a Boost code issue for this library, but a Python one.
>
> Regards,
>
> Matthieu
>
> Le mar. 25 déc. 2018 à 02:08, Oleg Smolsky via cfe-dev <
> cfe-dev_at_[hidden]> a écrit :
>
> Yes, this keyword is no longer valid starting from C++17:
>     https://en.cppreference.com/w/cpp/keyword/register
>
> I realize that the "why" probably doesn't help you move forth with your
> problem, so here are a couple suggestions how to get over it:
>
>    - Build Boost in C++14 mode with -std=c++14
>    - Cut out "register" from the Boost source and rebuild
>    - Try a newer Boost version, it may have been fixed
>
> Oleg.
> On 2018-12-23 09:26, Craig Topper via cfe-dev wrote:
>
> This seems a better question for cfe-dev or cfe-users
>
> ~Craig
>
>
> On Sat, Dec 22, 2018 at 12:23 PM Osman Zakir via llvm-dev <
> llvm-dev_at_[hidden]> wrote:
>
> When trying to build Boost using LLVM, I had this error:
> "
> error: ISO C++17 does not allow 'register' storage class specifier
> [-Wregister]
> "
> I attached the project-config.jam file I used to this message.  Someone
> please help me out (if there's someone on here who can).
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>
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