Re: What is going on with atomics?

[Matthias Klose <doko@debian.org>]

On 21.01.25 22:01, Colin Watson wrote:
> On Tue, Jan 21, 2025 at 10:31:29AM -0500, Theodore Ts'o wrote:
> > A question about --as-needed as an upstream developer who wants to
> > care about more than just Debian or Linux.  Am I correct in assuming
> > this will work on any system using GNU binutils?  And it doesn't
> > matter whether you are using gcc, clang, etc.  What about other OS's
> > such as *BSD, MacOS, etc.?

--as-needed has been there forever. The --push-state/--pop-state options 
are implemented in binutils 2014 (ld), and binutils 2016 (gold).  I 
didn't look at other linkers.

Using these in libtool still seems to be a problem, as libtool has it's 
own idea about how to re-sort command line options and libraries.

> I often consult Gnulib for lore on this kind of thing.
> https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=m4/lib-ignore.m4
> seems to have some useful hints, with comments for those not fluent in
> m4.
>
> This also seems to be a standalone file, so if your project is using
> Autoconf but not Gnulib, then you should be able to copy it into your
> project's local macro directory, add gl_IGNORE_UNUSED_LIBRARIES to
> configure.ac, and add $(IGNORE_UNUSED_LIBRARIES_CFLAGS) etc. to whatever
> *_LDFLAGS variable is appropriate.