[PATCH 02/20] kernel: export native PKGCONFIG variables

[bruce.ashfield@gmail.com]

From: Bruce Ashfield <bruce.ashfield@gmail.com>

In a similar manner to cml1.bbclass, we export the pkg-config
variables to allow a direct call to pkg-config access to the
native sysroot versus the target sysroot.

The kernel doesn't use pkg-config for target configuration,
and has many explicit calls to pkg-config, without the
possibility of easy override to pkg-config-native.

The calls to pkg-config could be made cross friendly via
replacement with make variables, but until that effort is
undertaken upstream, we need a bridge approach.

In particular, this is required for dtschema validation,
which is a requirement in kernel 5.16+

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
---
 meta/classes/kernel.bbclass | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index e0b752de19..2d219cb5e5 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -326,6 +326,13 @@ KERNEL_DEBUG_TIMESTAMPS ??= "0"
 
 kernel_do_compile() {
 	unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE
+
+	# setup native pkg-config variables (kconfig scripts call pkg-config directly, cannot generically be overriden to pkg-config-native)
+	export PKG_CONFIG_DIR="${STAGING_DIR_NATIVE}${libdir_native}/pkgconfig"
+	export PKG_CONFIG_PATH="$PKG_CONFIG_DIR:${STAGING_DATADIR_NATIVE}/pkgconfig"
+	export PKG_CONFIG_LIBDIR="$PKG_CONFIG_DIR"
+	export PKG_CONFIG_SYSROOT_DIR=""
+
 	if [ "${KERNEL_DEBUG_TIMESTAMPS}" != "1" ]; then
 		# kernel sources do not use do_unpack, so SOURCE_DATE_EPOCH may not
 		# be set....
-- 
2.19.1