[uclibc-ng-devel] [PATCH] include/features.h: add _DEFAULT_SOURCE macro

Thomas Petazzoni thomas.petazzoni at free-electrons.com
Thu Jun 22 15:06:53 CEST 2017


On Thu, 22 Jun 2017 08:47:06 -0400, Anthony G. Basile wrote:

> Yes, I'm worried about regressions.   __FAVOR_BSD is still used in the
> following:
> include/setjmp.h
> include/unistd.h
> include/signal.h
> include/features.h
> include/netinet/udp.h
> and deals with the differences in which signals and long jmps were
> handled in older BSD.  I don't know buildroot that well, but if you grep
> the tree, will it show where __FAVOR_BSD is used?  Or does it (like
> gentoo's portage) pull in source code as it builds.  I assume the latter
> so grepping is probably insufficient.

Buildroot is a build system, it doesn't contain code. It downloads the
source code of the selected packages, as part of the build process.

In addition, the knock package is not using __FAVOR_BSD anywhere, so
this problematic package would not even match on a grep __FAVOR_BSD.
What knock package is doing is that it assumes a BSD-style definition
of tcphdr will be provided if _BSD_SOURCE and _SVID_SOURCE are defined.

Best regards,

Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering

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