[Buildroot] [PATCH] linux: use host pkg-config when host libelf is set
Yann E. MORIN
yann.morin.1998 at free.fr
Mon Apr 8 16:36:56 UTC 2019
Stuart, All,
On 2019-04-08 16:00 +0000, Summers, Stuart spake thusly:
> On Sat, 2019-04-06 at 22:31 +0200, Yann E. MORIN wrote:
> > On 2019-04-05 11:47 -0700, Stuart Summers spake thusly:
> > > A patch was added to the Linux kernel in 5.1.0-rc3 which
> > > adds a requirement that the host build environment include
> > > pkg-config. Add the correct host-pkgconf dependency and
> > > environment variables to ensure Linux picks up the correct
> > > libraries.
[--SNIP--]
> > > -ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF),y)
> > > -LINUX_DEPENDENCIES += host-elfutils
> > > -endif
> >
> > Why did you move that block around?
>
> Moved this for a single conditional after the initial LINUX_MAKE_ENV =
> ...
Ah OK, makes sense.
However, this means that the various BR2_LINUX_KERNEL_NEEDS_HOST_*
blocks are all scatered around in the file, now.
What about:
- move the existign LINUX_MAKE_ENV assignment earlier in the file,
- keep the block in-place and expand it, like:
ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF),y)
LINUX_DEPENDENCIES += host-elfutils host-pkgconf
LINUX_MAKE_ENV += \
blablabla
endif
> I could have alternatively separated into two
> LINUX_KERNEL_NEEDS_HOST_LIBELF conditions, but I opted to squash them
> together.
Which is correct, I just missed the existing LINUX_MAKE_ENV location.
[--SNIP--]
> > If needed, please expand that blacklist with the two additional
> > PKG_CONFIG_ALLOW_SYSTEM_{CFLAGS,LIBS} this patch introduces.
>
> I apologize for my lack of understanding in this area. I'm happy to add
> this to the blacklist you mentioned. At least local testing seems to
> indicate that "make linux-menuconfig" works both with and without the
> blacklist. I tried this with a default configuration (make distclean ->
> make menuconfig -> enable Linux and use an architecture default config
> file -> make linux-menuconfig), and this results in a full host
> structure being set up in output/host. So it seems like the blacklist
> of these two extra variables isn't strictly necessary. Or am I missing
> something? That said, looking at the documentation, maybe this takes
> away the ability for a user to have a custom pkg-config path - I'm
> using the default installation. So in that sense, blacklisting does
> seem like the right thing to do. I'll add this and post a quick update.
TBH, I think we should really blacklist them, indeed, so that we are
sure the distro provided pkg-config works as expected.
Thanks for the feedback!
Regards,
Yann E. MORIN.
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