linux-kernel - Re: [PATCH] KVM: selftests: add -MP to CFLAGS

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Message-ID: <213451dcf8036133426aa04b6f377a16c6b53ff5.camel@infradead.org>
Date:   Mon, 30 Oct 2023 09:45:33 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     David Laight <David.Laight@...LAB.COM>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: selftests: add -MP to CFLAGS

On Sun, 2023-10-29 at 21:13 +0000, David Laight wrote:
> From: David Woodhouse
> > Sent: 28 October 2023 20:35
> > 
> > Using -MD without -MP causes build failures when a header file is deleted
> > or moved. With -MP, the compiler will emit phony targets for the header
> > files it lists as dependencies, and the Makefiles won't refuse to attempt
> > to rebuild a C unit which no longer includes the deleted header.
> 
> Won't a phony target stop a header being built if there is
> an actual rule to build it?

It probably would have taken you about the same time to find the answer
for yourself, as it took to write that email. Why don't you try it?

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