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From:	Dai Conrad <dai DOT conrad AT gmail DOT com>
Date:	Wed, 30 May 2018 12:13:56 -0400
Message-ID:	<CAEotdwmgDtx=ZrX4CT3qvHfTrr3+L4Y8gscYxF8AAJEgT9yZKg@mail.gmail.com>
Subject:	Re: Updated: gcc-7.3.0-2 (x86/x86_64)
To:	cygwin mailing list <cygwin AT cygwin DOT com>

On Tue, 29 May 2018 05:32 PM, Alberto Escrig Vidal
<alberto DOT escrig AT itc DOT uji DOT es> wrote:
> I have noticed a couple of issues with g++-7.
>
> 1)
>
> #include <string>
> #include <iostream>
> #include <sstream>
>
> int main()
> {
> std::string Str;
> std::stringstream ss("hello");
> std::getline(ss,Str);
> std::cout << Str;
>
> return 0;
> }
>
> Compiling the above program with:
>
> g++ -g -std=c++17 foo.cpp
>
> Compiles just fine, but aborts when running it.
>
> Running it with gdb:
>
> Program received signal SIGABRT, Aborted.
> 0x6326126a in cygstdc++-6!_ZNSs7reserveEj () from /usr/bin/cygstdc++-6.dllcomp
>
> The program works fine if compiled with -std=c++14.

This also happens with clang++ from clang-5.0.1-2:

0x00000003f0e9ca0b in cygstdc++-6!_ZNSs7reserveEm () from
/usr/bin/cygstdc++-6.dll

> 2)
>
> This program fails to compile (it also failed with g++-6).
>
> #include <shared_mutex>
>
> int main() {}

This fails with g++ -std=c++14 or -std=c++17; it compiles with
-std=c++11, gcc-g++-7.3.0-2.

It DOES NOT fail with clang++ at any of those language levels. I'm on
Windows 10, 64-bit
Cygwin, latest everything i.e. whatever I have installed is fully
updated via setup.

"I don't have a solution, but I certainly admire the problem."

David Conrad

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