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From: Lei Zhang <zhanglei.april@gmail.com>
Date: Tue, 14 Jun 2016 17:35:12 +0800
Message-ID: <CAOYuCc1JqdQg3eshzPvTYjo-8jHP0Z_NW+e6P2G2OT5gyQGW1w@mail.gmail.com>
Subject: Re: [gentoo-musl] [GSoC] _GNU_SOURCE in C++
To: Luca Barbato <lu_zero@gentoo.org>
Cc: gentoo-musl@lists.gentoo.org
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2016-06-14 17:28 GMT+08:00 Luca Barbato <lu_zero@gentoo.org>:
> On 14/06/16 11:17, Lei Zhang wrote:
>> 2016-06-14 17:12 GMT+08:00 Luca Barbato <lu_zero@gentoo.org>:
>>> On 14/06/16 10:28, Lei Zhang wrote:
>>>> 2016-06-14 16:10 GMT+08:00 Felix Janda <felix.janda@posteo.de>:
>>>>> Take a look at the discussion at
>>>>>
>>>>> http://www.openwall.com/lists/musl/2014/04/15/3
>>>>
>>>> And some view from the LLVM side:
>>>>
>>>> http://article.gmane.org/gmane.comp.compilers.clang.devel/46390
>>>>
>>>> IMHO, the real problem is the abuse of _GNU_SOURCE by C++ compiler.
>>>> The decisions made by LLVM and musl both look reasonable to me.
>>>>
>>>
>>> -U_GNU_SOURCE would make you get through the problem for the time being?
>>>
>>> Given you aren't using libstdc++ in that case, assuming libcxx does not
>>> have the need probably might be the easiest workaround.
>>
>> Unfortunately libc++ depends on this macro as well:
>>
>> http://lists.llvm.org/pipermail/cfe-dev/2016-June/049447.html
>>
>> I'm imagining some ugly hacks on LLVM now...
>>
>
> Please try to prepare a list and blog about this problem since possibly
> needs additional awareness.
>
> If the symbols needed aren't GNU-only there are other macros to expose
> them (and the llvm people just went the lazy route to get them).
I agree. It seems libstdc++ is also taking the lazy route, and someone
intended to fix it:
https://lwn.net/Articles/590504/
but I see no progress so far.
Lei