[PATCH 0/1] Add explicit error for missing CONFIG_ASN1

From: James Bottomley
Date: Tue Sep 22 2020 - 12:00:19 EST


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(+)

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2.26.2