sstate: Avoid indirect bison-native dependencies (via SSTATE_EXCLUDEDEPS_SYSROOT)

Avoid adding bison-native to the sysroot without a specific
dependency in the recipe. This means indirect dependencies
(e.g. X -> Y -> binutils-cross -> bison-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@jci.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/conf/layer.conf b/meta/conf/layer.conf
index 0a8f8ed9eb5f4c38ec4b61d0e1906e2d12a20607..cc77d078a8042e79e6b1b815ef0b93be1bcd5a7f 100644 (file)
--- a/meta/conf/layer.conf
+++ b/meta/conf/layer.conf
@@ -78,6 +78,12 @@ SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += " \
   weston-init->kbd \
 "
 
+# Avoid adding bison-native to the sysroot without a specific
+# dependency in the recipe. This means indirect dependencies
+# (e.g. X -> Y -> binutils-cross -> bison-native) no longer meet the
+# dependency incidentally. This improves determinism and avoids build
+# failures when people switch to external toolchains.
+SSTATE_EXCLUDEDEPS_SYSROOT += ".*->bison-native"
 # Nothing needs to depend on libc-initial/gcc-cross-initial
 # base-passwd/shadow-sysroot don't need their dependencies
 SSTATE_EXCLUDEDEPS_SYSROOT += "\