[OE-core] [PATCH 4/4] sstate: avoid indirect bison/flex-native dependencies (via SSTATE_EXCLUDEDEPS_SYSROOT)

[André Draszik]

From: André Draszik <andre.draszik at jci.com>

Avoid adding flex-native or bison-native to the sysroot without a specific
dependency in the recipe. This means indirect dependencies
(e.g. X -> Y -> binutils-cross -> flex-native) no longer meet the
dependency incidentally. This improves determinism and avoids build
failures when people switch to external toolchains.

Based on an idea by Richard Purdie:
    http://lists.openembedded.org/pipermail/openembedded-core/2018-January/146324.html

Signed-off-by: André Draszik <andre.draszik at jci.com>
---
 meta/conf/layer.conf | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/conf/layer.conf b/meta/conf/layer.conf
index 0a8f8ed9eb..106f9900dd 100644
--- a/meta/conf/layer.conf
+++ b/meta/conf/layer.conf
@@ -78,6 +78,12 @@ SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += " \
   weston-init->kbd \
 "
 
+# Avoid adding flex-native or bison-native to the sysroot without a specific
+# dependency in the recipe. This means indirect dependencies
+# (e.g. X -> Y -> binutils-cross -> flex-native) no longer meet the
+# dependency incidentally. This improves determinism and avoids build
+# failures when people switch to external toolchains.
+SSTATE_EXCLUDEDEPS_SYSROOT += ".*->(flex|bison)-native"
 # Nothing needs to depend on libc-initial/gcc-cross-initial
 # base-passwd/shadow-sysroot don't need their dependencies
 SSTATE_EXCLUDEDEPS_SYSROOT += "\
-- 
2.17.0