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Subject:	Re: Why is popen from stdio.h disabled with -std=c++11?
To:	cygwin AT cygwin DOT com
References:	<CA+Ni7jPd8kpSJgM2DGoMvuUpQL9Kf-vxyyw_6yQiqig5-s6hfw AT mail DOT gmail DOT com>
From:	Yaakov Selkowitz <yselkowitz AT cygwin DOT com>
Message-ID:	<cb06911b-93e1-dadf-1b55-0c94955bc0ff@cygwin.com>
Date:	Mon, 30 Jan 2017 11:38:25 -0600
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On 2017-01-30 10:41, Пётр Б. wrote:
> Why is popen from stdio.h disabled with -std=c++11? I am trying to
> grasp it and I can't.
>
> It is exposed if -std=c11 but not for c++11.

No, it's not, you get an implicit function declaration warning in C. 
C++ is simply less forgiving (which is not a bad thing in this case).

> What is the problem and can it be solved?

Use -std=gnu++11, or -D_DEFAULT_SOURCE with -std=c++11.

> Why does -std=c++11 prevent POSIX visibility?

Because it means ISO standard C++, which popen is not.

> MinGW exposes popen as _popen, could it be an option for Cygwin?

Absolutely not, that is an MSVC-ism.

-- 
Yaakov

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