kbuild/btf: Propagate CONFIG_WERROR to resolve_btfids

Use CONFIG_WERROR to also fail on warnings emitted by resolve_btfids.
Allow the CI bots to prevent the introduction of new warnings.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20241204-resolve_btfids-v3-2-e6a279a74cfd@weissschuh.net

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index d853ddb3b28c1238ec9079ebbbe77df26980a0a1..56a077d204cfa1b67609cf0ea4a8ebe5f5884f03 100755 (executable)
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -283,7 +283,11 @@ vmlinux_link vmlinux
 # fill in BTF IDs
 if is_enabled CONFIG_DEBUG_INFO_BTF; then
        info BTFIDS vmlinux
-       ${RESOLVE_BTFIDS} vmlinux
+       RESOLVE_BTFIDS_ARGS=""
+       if is_enabled CONFIG_WERROR; then
+               RESOLVE_BTFIDS_ARGS=" --fatal_warnings "
+       fi
+       ${RESOLVE_BTFIDS} ${RESOLVE_BTFIDS_ARGS} vmlinux
 fi
 
 mksysmap vmlinux System.map