[PATCH] multilib.conf: Ensure that RECIPE_SYSROOT is unchanged for native

[Mike Crowe <mac@mcrowe.com>]

Ensure that RECIPE_SYSROOT is the same for -native recipes whether
multilib.conf is included or not.

Without this change task signatures for -native recipes change when
switching between MACHINEs that require multilib.conf and those that
don't.

This fix was one of the ones suggested by Khem Raj in
http://lists.openembedded.org/pipermail/openembedded-core/2019-December/290303.html

Add test_sstate_multilib_or_not_native_samesigs test case to
sstatetests.py to ensure that this stays fixed.

Signed-off-by: Mike Crowe <mac@mcrowe.com>
---
 meta/conf/multilib.conf                     |  1 +
 meta/lib/oeqa/selftest/cases/sstatetests.py | 40 +++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/meta/conf/multilib.conf b/meta/conf/multilib.conf
index cfed3fbbd0..58f2ac5c86 100644
--- a/meta/conf/multilib.conf
+++ b/meta/conf/multilib.conf
@@ -9,6 +9,7 @@ MULTILIBS ??= "multilib:lib32"
 STAGING_DIR_HOST = "${WORKDIR}/${MLPREFIX}recipe-sysroot"
 STAGING_DIR_TARGET = "${WORKDIR}/${MLPREFIX}recipe-sysroot"
 RECIPE_SYSROOT = "${WORKDIR}/${MLPREFIX}recipe-sysroot"
+RECIPE_SYSROOT_class-native = "${WORKDIR}/recipe-sysroot"
 
 INHERIT += "multilib_global"
 
diff --git a/meta/lib/oeqa/selftest/cases/sstatetests.py b/meta/lib/oeqa/selftest/cases/sstatetests.py
index 6757a0ec68..9adb511960 100644
--- a/meta/lib/oeqa/selftest/cases/sstatetests.py
+++ b/meta/lib/oeqa/selftest/cases/sstatetests.py
@@ -446,6 +446,46 @@ BB_SIGNATURE_HANDLER = "OEBasicHash"
         self.assertCountEqual(files1, files2)
 
 
+    def test_sstate_multilib_or_not_native_samesigs(self):
+        """The sstate checksums of two native recipes (and their dependencies)
+        where the target is using multilib in one but not the other
+        should be the same. We use the qemux86copy machine to test
+        this.
+        """
+
+        self.write_config("""
+TMPDIR = \"${TOPDIR}/tmp-sstatesamehash\"
+TCLIBCAPPEND = \"\"
+MACHINE = \"qemux86\"
+require conf/multilib.conf
+MULTILIBS = "multilib:lib32"
+DEFAULTTUNE_virtclass-multilib-lib32 = "x86"
+BB_SIGNATURE_HANDLER = "OEBasicHash"
+""")
+        self.track_for_cleanup(self.topdir + "/tmp-sstatesamehash")
+        bitbake("binutils-native  -S none")
+        self.write_config("""
+TMPDIR = \"${TOPDIR}/tmp-sstatesamehash2\"
+TCLIBCAPPEND = \"\"
+MACHINE = \"qemux86copy\"
+BB_SIGNATURE_HANDLER = "OEBasicHash"
+""")
+        self.track_for_cleanup(self.topdir + "/tmp-sstatesamehash2")
+        bitbake("binutils-native -S none")
+
+        def get_files(d):
+            f = []
+            for root, dirs, files in os.walk(d):
+                for name in files:
+                    f.append(os.path.join(root, name))
+            return f
+        files1 = get_files(self.topdir + "/tmp-sstatesamehash/stamps")
+        files2 = get_files(self.topdir + "/tmp-sstatesamehash2/stamps")
+        files2 = [x.replace("tmp-sstatesamehash2", "tmp-sstatesamehash") for x in files2]
+        self.maxDiff = None
+        self.assertCountEqual(files1, files2)
+
+
     def test_sstate_noop_samesigs(self):
         """
         The sstate checksums of two builds with these variables changed or
-- 
2.24.0