The root cause is that the newer version of libyang has changed or removed certain v2 APIs that frr still depends on, specifically the LYD_PRINT_WITHSIBLINGSflag and the structure used for default values. As noted, this is a compatibility break. I have also checked the upstream communities for both libyang and frr. There is no official fix or patch available yet to resolve this API incompatibility. The upgrade should be postponed until the upstream frr project has been adapted to work with the new libyang APIs, or until a compatible patch is provided.
-- Best Regards --------------------------------------------------- Wang Mingyu FUJITSU NANJING SOFTWARE TECHNOLOGY CO., LTD. (FNST) No.6 Wenzhu Road, Nanjing, 210012, China TEL：+86+25-86630566--8568 COINS: 79988548 FAX: +86+25-83317685 MAIL: [email protected]<mailto:[email protected]> From: Khem Raj <[email protected]> Sent: Thursday, February 26, 2026 12:32 PM To: Wang, Mingyu/王 鸣瑜 <[email protected]> Cc: [email protected] Subject: Re: [oe] [meta-oe] [PATCH 19/33] libyang: upgrade 3.13.6 -> 4.2.2 this breaks frr. Seems frr is still needing v2 APIs but with this version it has either changed or removed these APIs. Please take a look | lib/northbound.c: In function 'nb_config_diff': | lib/northbound.c:641:36: error: 'LYD_PRINT_WITHSIBLINGS' undeclared (first use in this function); did you mean 'LYD_PRINT_SIBLINGS'? | 641 | LYD_PRINT_WITHSIBLINGS | LYD_PRINT_WD_ALL)) { | | ^~~~~~~~~~~~~~~~~~~~~~ | | LYD_PRINT_SIBLINGS | lib/northbound.c:641:36: note: each undeclared identifier is reported only once for each function it appears in | lib/northbound.c: In function 'nb_cb_operation_is_valid': | lib/northbound.c:2302:29: error: invalid operands to binary || (have 'int' and 'struct lysc_value') | 2302 | || sleaf->dflt) | | ^~ ~~~~~~~~~~~ | | | | | struct lysc_value On Wed, Feb 25, 2026 at 1:38 AM wangmy via lists.openembedded.org<http://lists.openembedded.org> <[email protected]<mailto:[email protected]>> wrote: From: Wang Mingyu <[email protected]<mailto:[email protected]>> Changelog: ========== - new SO version 4 all the important changes mentioned in the transition manual - major LYB binary format optimizations - user-ordered lists diff fixes - validation optimizations - lots of other bugfixes and improvements Signed-off-by: Wang Mingyu <[email protected]<mailto:[email protected]>> --- .../libyang/{libyang_3.13.6.bb<http://libyang_3.13.6.bb> => libyang_4.2.2.bb<http://libyang_4.2.2.bb>} | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) rename meta-oe/recipes-extended/libyang/{libyang_3.13.6.bb<http://libyang_3.13.6.bb> => libyang_4.2.2.bb<http://libyang_4.2.2.bb>} (96%) diff --git a/meta-oe/recipes-extended/libyang/libyang_3.13.6.bb<http://libyang_3.13.6.bb> b/meta-oe/recipes-extended/libyang/libyang_4.2.2.bb<http://libyang_4.2.2.bb> similarity index 96% rename from meta-oe/recipes-extended/libyang/libyang_3.13.6.bb<http://libyang_3.13.6.bb> rename to meta-oe/recipes-extended/libyang/libyang_4.2.2.bb<http://libyang_4.2.2.bb> index 822c30ba24..4b2ceaaa17 100644 --- a/meta-oe/recipes-extended/libyang/libyang_3.13.6.bb<http://libyang_3.13.6.bb> +++ b/meta-oe/recipes-extended/libyang/libyang_4.2.2.bb<http://libyang_4.2.2.bb> @@ -6,7 +6,7 @@ LICENSE = "BSD-3-Clause" LIC_FILES_CHKSUM = "file://LICENSE;md5=b69fd3b2815bbf1cef5c97f0eee2519a" -SRCREV = "c2ddd01b9b810a30d6a7d6749a3bc9adeb7b01fb" +SRCREV = "3d07c3a71534a580c3960907da17568eff7e5c64" SRC_URI = "git://github.com/CESNET/libyang.git;branch=master;protocol=https;tag=v${PV}<http://github.com/CESNET/libyang.git;branch=master;protocol=https;tag=v$%7BPV%7D> \ file://0001-test_context-skip-test-case-test_searchdirs.patch \ -- 2.43.0
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