I recently ran into this as an error from 0day. On x86 it's pretty much impossible to build a configuration where CONFIG_ASN1 isn't set, so you rarely notice a problem using the ASN.1 compiler because something else has selected it. However, this compiler is never built if CONFIG_ASN1 isn't set and the error you get from kbuild is particularly unhelpful: make[4]: *** No rule to make target 'security/keys/trusted-keys/tpm2key.asn1.o', needed by 'security/keys/trusted-keys/built-in.a'. make[4]: *** [scripts/Makefile.build:283: security/keys/trusted-keys/trusted_tpm2.o] Error 1 make[4]: Target '__build' not remade because of errors. This patch changes the above error to the much easier to diagnose: scripts/Makefile.build:387: *** CONFIG_ASN1 must be defined for the asn1_compiler. Stop. make[3]: *** [scripts/Makefile.build:505: security/keys/trusted-keys] Error 2 James --- James Bottomley (1): Makefile.build: Add an explicit error for missing ASN.1 compiler scripts/Makefile.build | 5 +++++ 1 file changed, 5 insertions(+) -- 2.26.2
