[arch-dev-public] Changing compilation flags

[Daniel Micay]

On Wed, 2017-07-05 at 12:36 +0300, Evangelos Foutras wrote:
> On 2 July 2017 at 19:19, Daniel Micay via arch-dev-public
> <arch-dev-public at archlinux.org> wrote:
> > Using -fno-plt would be a nice tiny little performance boost at
> > runtime
> > but then it's important to make sure everything is compiled with
> > -Wl,-
> > z,now and there might be programs ignoring LDFLAGS but respecting
> > CFLAGS. Ideally -z now would be the default in the linker first. If
> > we
> > aren't going to patch the default, then I think a configure flag for
> > that needs to land upstream.
> 
> It's also worth noting that clang does not support the -fno-plt option
> and I couldn't find any discussions about adding support for it.
> 
> If it's only a tiny performance improvement, I strongly believe we
> should skip it for now.

There's no loss of compatibility from only some code using it. The only
issue with it is that immediate binding *must* be used to support it, so
if CFLAGS is respected then LDFLAGS *must* be respected, or immediate
binding needs to be set as the default in the linker(s).