The pkgconf fork filters -I and -L flag values from .pc files which match
pkgconf's builtin system directory value.
During configure, pkgconf derives the default system include and library
search path values from exec_prefix, which is set to staging_dir/host in
the host tool build phase.
Due to that, pkgconf will drop all -I and -L flags pointing to
staging_dir/host/include or staging_dir/host/lib, unless invoked with
--keep-system-cflags and --keep-system-libs respectively, breaking our
kernel libelf discovery / stack validation workarounds.
In order to inhibit the filtering, add --keep-system-cflags and
--keep-system-libs to our pkg-config shell wrapper.
Fixes: GH#2832
Fixes: 867298cf47 ("tools/pkg-config: Replace with pkgconf")
Ref: https://lists.infradead.org/pipermail/openwrt-devel/2020-March/022182.html
Ref: https://git.openwrt.org/fe43969336201f2cc7d103b68fd6e65989bee184
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Acked-by: Petr Štetiar <ynezz@true.cz>
pkgconf is a newer, actively maintained implementation of pkg-config that
supports more aspects of the pkg-config file specification and provides a
library interface that applications can use to incorporate intelligent
handling of pkg-config files into themselves (such as build file
generators, IDEs, and compilers). Through its pkg-config compatibility
interface (activated when it is run as "pkg-config"), it also can
completely replace the original implementation.
It is also lighterweight and does not require glib2, as pkg-config does.
On other distros, pkgconf is symlinked to pkg-config. For simplicity here,
it is renamed to pkg-config.real, as in the original package.
Initial results have been positive. As before, pkgconf works as long as
the pkg-config files point to the proper paths.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
[backported upstream fix for Meson]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
