This will move the quilt cache from the default location '$S/.pc' to
'$S/patches/.pc', to ensure source invalidation always wipes it out,
together with all patches.

Recipes which set $S to $WORKDIR are susceptible to a weird issue: if
a source file is patched by quilt (a .bbappend adds a patch), updates
to it are ignored by incremental builds, the first obsolete version is
picked again and again. This is because quilt keeps its own cache in
'$S/.pc', and this one survives source invalidation on do_unpack.

This is a follow-up for a56fb90dc380 and 42a513489dc6

Signed-off-by: Andriy Danylovskyy <andriy.danylovs...@streamunlimited.com>
---
 meta/classes-global/patch.bbclass | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/meta/classes-global/patch.bbclass 
b/meta/classes-global/patch.bbclass
index e3157c7b18..6fcac18d9c 100644
--- a/meta/classes-global/patch.bbclass
+++ b/meta/classes-global/patch.bbclass
@@ -5,6 +5,9 @@
 # Point to an empty file so any user's custom settings don't break things
 QUILTRCFILE ?= "${STAGING_ETCDIR_NATIVE}/quiltrc"
 
+# Move quilt's cache to ensure it always gets removed together with "patches"
+export QUILT_PC = "${S}/patches/.pc"
+
 PATCHDEPENDENCY = "${PATCHTOOL}-native:do_populate_sysroot"
 
 # There is a bug in patch 2.7.3 and earlier where index lines
-- 
2.17.1

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