[dpdk-dev] [RFC PATCH] mk: symlink every headers first

Thomas Monjalon thomas at monjalon.net
Wed Jun 21 12:41:42 CEST 2017

21/06/2017 12:27, Bruce Richardson:
> On Tue, Jun 20, 2017 at 11:21:39PM +0200, Thomas Monjalon wrote:
> > If a library or a build tool uses a definition from a driver,
> > there is a build ordering issue, like seen when moving PCI code
> > into a bus driver.
> > 
> > One option is to keep PCI helpers and some common definitions in EAL.
> > The other option is to symlink every headers at the beginning of
> > the build so they can be included by any other component.
> > 
> > This patch shows how to achieve the second option.
> > 
> > Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
> > ---
> My 2c.
> This may be worth doing, however, two points to consider.
> 1. If we look to change build system this may not be worth doing unless
> a compelling need becomes obvious in the short term. In the meantime,
> for cases where it is needed...
> 2. libraries can already access the includes from drivers or other
> places fairly easily, just by adding the relevant "-I" flag to the
> CFLAGS for that lib.

You mean adding a -I pointing to source location instead of
the build directory?

> That said, since the work is already done developing this, and if it
> doesn't hurt in terms of build time, I suppose we might as well merge
> it in.

It hurts a bit the build time.

> So tentative ack from me, subject to testing and feedback from others.

I would prefer not applying this patch if Gaetan can organize EAL and
bus drivers in a way that everything compile fine.
Libraries should not look into drivers.

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