Since b8c96a6b466c ("certs: simplify $(srctree)/ handling and remove
config_filename macro"), when CONFIG_MODULE_SIG_KEY is empty,
signing_key.x509 fails to build:
CERT certs/signing_key.x509
Usage: extract-cert <source> <dest>
make[1]: *** [certs/Makefile:78: certs/signing_key.x509] Error 2
make: *** [Makefile:1831: certs] Error 2
Pass "" to the first argument of extract-cert to fix the build error.
Link: https://lore.kernel.org/linux-kbuild/20220120094606.2skuyb26yjlnu66q@xxxxxxxxxxxxxx/T/#u
Fixes: b8c96a6b466c ("certs: simplify $(srctree)/ handling and remove config_filename macro")
Reported-by: Michal Kubecek <mkubecek@xxxxxxx>
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
certs/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/certs/Makefile b/certs/Makefile
index 0c459cfd09df..3ea7fe60823f 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -75,7 +75,7 @@ endif
$(obj)/system_certificates.o: $(obj)/signing_key.x509
$(obj)/signing_key.x509: $(X509_DEP) $(obj)/extract-cert FORCE
- $(call if_changed,extract_certs,$(if $(X509_DEP),$<,$(CONFIG_MODULE_SIG_KEY)))
+ $(call if_changed,extract_certs,$(if $(CONFIG_MODULE_SIG_KEY),$(if $(X509_DEP),$<,$(CONFIG_MODULE_SIG_KEY)),""))
endif # CONFIG_MODULE_SIG
targets += signing_key.x509
--
2.32.0
