linux-kernel - Re: [PATCH 10/14] KVM: selftests: Include lib.mk before consuming $(CC)

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Date:   Sat, 24 Dec 2022 10:18:35 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Tom Rix <trix@...hat.com>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu, linux-riscv@...ts.infradead.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Ricardo Koller <ricarkol@...gle.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Raghavendra Rao Ananta <rananta@...gle.com>
Subject: Re: [PATCH 10/14] KVM: selftests: Include lib.mk before consuming
 $(CC)

On 12/13/22 01:16, Sean Christopherson wrote:
> Include lib.mk before consuming $(CC) and document that lib.mk overwrites
> $(CC) unless make was invoked with -e or $(CC) was specified after make
> (which apparently makes the environment override the Makefile?!?!).

Yes, it does.  In projects that don't use configure or similar, you 
might have seen

CFLAGS = -O2 -g

to be overridden with "make CFLAGS=-g" if optimization is undesirable.

Paolo

> Including lib.mk after using it for probing, e.g. for -no-pie, can lead
> to weirdness.