multilib.bbclass: Reduce ALTERNATIVE_PRIORITY for extended recipes

Fixed:
MACHINE = "qemux86-64"
require conf/multilib.conf
MULTILIBS = "multilib:lib32"
DEFAULTTUNE_virtclass-multilib-lib32 = "x86"

$ bitbake core-image-minimal
update-alternatives: libtool has multiple providers with the same priority,
please check
/path/to/rootfs/usr/lib/opkg/alternatives/libtool for details

Both libtool and lib32-libtool have the same priority (as they're the same
recipe), so update-alternatives won't deterministically pick a provider. This
means you could end up with an image using a 32-bit pkgconfig and 64-bit
libtool, for example.

Make extended recipes reduce priority by 1 (or 2, 3 ... when there are multiple
variants in MULTILIB_VARIANTS) to fix the problem.

[YOCTO #13418]

(From OE-Core rev: a2f53255ed7fb3657c470cd6a4452d883edd11cc)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/meta/classes/multilib.bbclass b/meta/classes/multilib.bbclass
index 7750221f7d..d625bd527c 100644
--- a/meta/classes/multilib.bbclass
+++ b/meta/classes/multilib.bbclass
@@ -125,8 +125,55 @@ python __anonymous () {
     clsextend.map_variable("USERADD_PACKAGES")
     clsextend.map_variable("SYSTEMD_PACKAGES")
     clsextend.map_variable("UPDATERCPN")
+
+    reset_alternative_priority(d)
 }
 
+def reset_alternative_priority(d):
+    if not bb.data.inherits_class('update-alternatives', d):
+        return
+
+    # There might be multiple multilibs at the same time, e.g., lib32 and
+    # lib64, each of them should have a different priority.
+    multilib_variants = d.getVar('MULTILIB_VARIANTS')
+    bbextendvariant = d.getVar('BBEXTENDVARIANT')
+    reset_gap = multilib_variants.split().index(bbextendvariant) + 1
+
+    # ALTERNATIVE_PRIORITY = priority
+    alt_priority_recipe = d.getVar('ALTERNATIVE_PRIORITY')
+    # Reset ALTERNATIVE_PRIORITY when found
+    if alt_priority_recipe:
+        reset_priority = int(alt_priority_recipe) - reset_gap
+        bb.debug(1, '%s: Setting ALTERNATIVE_PRIORITY to %s' % (d.getVar('PN'), reset_priority))
+        d.setVar('ALTERNATIVE_PRIORITY', reset_priority)
+
+    handled_pkgs = []
+    for pkg in (d.getVar('PACKAGES') or "").split():
+        # ALTERNATIVE_PRIORITY_pkg = priority
+        alt_priority_pkg = d.getVar('ALTERNATIVE_PRIORITY_%s' % pkg)
+        # Reset ALTERNATIVE_PRIORITY_pkg when found
+        if alt_priority_pkg:
+            reset_priority = int(alt_priority_pkg) - reset_gap
+            if not pkg in handled_pkgs:
+                handled_pkgs.append(pkg)
+                bb.debug(1, '%s: Setting ALTERNATIVE_PRIORITY_%s to %s' % (pkg, pkg, reset_priority))
+                d.setVar('ALTERNATIVE_PRIORITY_%s' % pkg, reset_priority)
+
+        for alt_name in (d.getVar('ALTERNATIVE_%s' % pkg) or "").split():
+            # ALTERNATIVE_PRIORITY_pkg[tool]  = priority
+            alt_priority_pkg_name = d.getVarFlag('ALTERNATIVE_PRIORITY_%s' % pkg, alt_name)
+            # ALTERNATIVE_PRIORITY[tool] = priority
+            alt_priority_name = d.getVarFlag('ALTERNATIVE_PRIORITY', alt_name)
+
+            if alt_priority_pkg_name:
+                reset_priority = int(alt_priority_pkg_name) - reset_gap
+                bb.debug(1, '%s: Setting ALTERNATIVE_PRIORITY_%s[%s] to %s' % (pkg, pkg, alt_name, reset_priority))
+                d.setVarFlag('ALTERNATIVE_PRIORITY_%s' % pkg, alt_name, reset_priority)
+            elif alt_priority_name:
+                reset_priority = int(alt_priority_name) - reset_gap
+                bb.debug(1, '%s: Setting ALTERNATIVE_PRIORITY[%s] to %s' % (pkg, alt_name, reset_priority))
+                d.setVarFlag('ALTERNATIVE_PRIORITY', alt_name, reset_priority)
+
 PACKAGEFUNCS_append = " do_package_qa_multilib"
 
 python do_package_qa_multilib() {