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Subject: Re: GCC 7.3.0 -std=gnu++17 failed to getline() from std::ifstream
From: Christian Franke <Christian DOT Franke AT t-online DOT de>
To: cygwin AT cygwin DOT com
References: <CAHVoUt2pHP46o6ERwx9HB5=Dn-J9xv5i-53RYtJbdev-K9DCeQ AT mail DOT gmail DOT com> <0725bdbd-0411-138a-7ea9-d6395e3256e3 AT t-online DOT de> <da63d7d5-4ccc-8171-710a-0105219888e3 AT gmail DOT com> <b4f361ca-9927-c3d4-5530-2d2fd4dfd24e AT t-online DOT de>
Message-ID: <132567e2-8ddb-6675-1b8d-1777be1b4d99@t-online.de>
Date: Fri, 22 Jun 2018 10:48:57 +0200
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Christian Franke wrote:
> Marco Atzeri wrote:
>> On 6/12/2018 7:11 PM, Christian Franke wrote:
>>> ...
>>> The attached patch for
>>> /usr/lib/gcc/*-pc-cygwin/7.3.0/include/c++/bits/basic_string.h
>>> fixes this.
>>>

Please forget this patch. It was bases on a wrong assumption and only 
cures symptoms.


>>
>> It seems an upstream bug so could you report it there ?
>>
>
> Done:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86138
>

If build with -std=c++17, a duplicate _S_empty_rep_storage[] which 
already exists in the DLL is generated in the executable. This results 
in a false negative string.empty() test in the DLL. See:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86138#c6

Workarounds:
- Link with -static, or
- Compile with -D_GLIBCXX_USE_CXX11_ABI

Fix:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=261873

Regards,
Christian


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