Re: [gpsd-dev] featuretest macros

[Gary E. Miller]

Yo Greg!

On Fri, 21 Jun 2019 09:58:25 -0400
Greg Troxel <address@hidden> wrote:

> As an experiment, I removed all the lines in SConstruct that add
> featuretest macros.  gpsd built without any problems on NetBSD-8
> amd64. I get the same warnings I posted earlier.

Our problems have been with older distros.  For example, glibc before
2.10 is a lot messier.  Fred Wright has been testing those, but he is
out of the country right now and can not test.

> This doesn't surprise me; gpsd's usage is POSIX and common extensions.
> I know of only one function that's hidden by default in NetBSD, which
> is the OpenBSD variant of a function (that originated in OpenBSD) and
> is different in NetBSD: for that one needs to define _OPENBSD_SOURCE.

Which function?  I would like to document that in the SConstruct file.

> I think it's reasonably likely that the same results will be obtained
> on other platforms.  But perhaps glibc or other things needs to be
> told to include things in POSIX 2008 explicitly.

Before glibc 2.10 and 2.19 things were ugly.  So testing older stuff,
like the newest RHEL, is important.

> I am not proposing that we change this now, as I gather we are close
> to releasing 3.19.  Merely a data point for future thought.

I'd love to test, after 3.19.  But recent experience does not make
me feel confident that the defines can all go.  They can likely
be made better.

> diff --git a/SConstruct b/SConstruct
> index 91ff42d8..f8e0c05b 100644

Tested on Gentoo stable.  It fails.

RGDS
GARY
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