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certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 

Since b8c96a6b46 ("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@lion.mk-sys.cz/T/#u
Fixes: b8c96a6b46 ("certs: simplify $(srctree)/ handling and remove config_filename macro")
Reported-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Michal Kubecek <mkubecek@suse.cz>
This commit is contained in:
Masahiro Yamada 2022-01-21 04:22:05 +09:00
parent ad29a2fb3c
commit e6340b6526
1 changed files with 1 additions and 1 deletions
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2
certs/Makefile
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@ -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