__STDC_VERSION__ : What C dialect c89, c99,gnu90 kernel compiies

Greg KH greg at kroah.com
Wed May 20 04:44:04 EDT 2020

On Wed, May 20, 2020 at 10:30:53AM +0300, Lev R. Oshvang . wrote:
> Hi All,
> I am building out of tree kernel module.

Did you read the kernel documentation for how to do this?

> I am trying to include user-space lib into kernel module

You can't do this, sorry, it's not allowed at all, unless you build the
code for that library into your kernel module directly.

What problem are you trying to solve with this?

> This  API gives me the following warning :
> "__STDC_VERSION__" is not defined, evaluates to 0
> But continues and resulted module works,
> I see from https://gcc.gnu.org/onlinedocs/cpp/Standard-Predefined-Macros.html
> that _STDC_VERSION__ is a built-in gcc macro, so I think that evenh
> kernel compilation should be able to see it.

There is no standard c library within the kernel, sorry.

greg k-h

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