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Date: Wed, 21 Oct 2015 02:08:48 +0500
Message-ID: <CABuVarJAvo8TDR9-PRHghp6A=xMDPniVaZaGAqmN9uuQJ6NHWg@mail.gmail.com>
Subject: Re: [geda-user] C99
From: "Sergey Stepanov (no DOT such DOT process AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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> Does it mean that functions related to C99 like 'hypot' cannot be used yet

This one is supported for years (or even decades) as an extension to
C89. There is one problem with it: if you use C89 and specific flags
to compile 'pure c code', you should turn on some defines before
`#include <math.h>`

> though now I cannot find that branch in the repo.

I just return it back after rebasing and testing.

2015-10-20 23:49 GMT+05:00 Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via
geda-user AT delorie DOT com] <geda-user AT delorie DOT com>:
> On Tue, Oct 20, 2015 at 02:18:38PM -0400, DJ Delorie wrote:
>>
>> > Probably I have an opportunity to ask a question about the C99 standard :)
>> > Are any issues mentioned at [1] still relevant? Could any issues appear if
>> > we start to support it?
>>
>> My only concern about C99 is that, despite appearing to be 16 years
>> old, it's not.  GCC 4 still defaults to C89, you need to override the
>> default or use GCC 5 to get C99 by default.
>>
>> The big disconnect between C89 and C99 is the difference between
>> "extern inline" and "static inline", GCC 4's interpretation is
>> different than GCC 5's, so we should avoid those constructs during the
>> migration.
>
> OK, thanks for that.
>
> Does it mean that functions related to C99 like 'hypot' cannot be used
> yet (at least wikipedia mentions C99 as one of the languages supporting
> it)? (I've seen them a while ago in a branch by Sergey Stepanov, our new
> developer, though now I cannot find that branch in the repo.)