Why does -std=c++11 hide certain function calls

[Hans-Bernhard Bröker]

Am 05.09.2018 um 07:55 schrieb John Selbie:

> With this: g++ foo.cpp -c -std=c++11
> It compiles fine everywhere else, except CygWin.  Output on Cygwin:

I'm afraid that may mean everywhere else is wrong.

> Yes, switching to -std=gnu++11 or adding  -D_DEFAULT_SOURCE to the command
> line line works.
> 
> But I don't understand why the need to enforce these extensions to get
> access to some of the most common unix libraries? 

Because that's what std=c++11 is meant and documented to do.  It turns 
off all extensions to the standard language.  And yes, that does include 
extensions to the standard libary, up to and including POSIX-specific 
content.

For what you want to do, std=c++11 is simply the wrong setting.

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