linux-kernel - Re: [PATCH v21 24/28] selftests/x86: Add a selftest for SGX

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Date:   Fri, 16 Aug 2019 19:56:08 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Xing, Cedric" <cedric.xing@...el.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, haitao.huang@...el.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, bp@...en8.de, josh@...htriplett.org,
        luto@...nel.org, kai.huang@...el.com, rientjes@...gle.com
Subject: Re: [PATCH v21 24/28] selftests/x86: Add a selftest for SGX

On Wed, Jul 17, 2019 at 03:37:03PM -0700, Xing, Cedric wrote:
> > +$(TEST_CUSTOM_PROGS): $(OUTPUT)/main.o $(OUTPUT)/sgx_call.o \
> > +		      $(OUTPUT)/encl_piggy.o
> > +	$(CC) $(HOST_CFLAGS) -o $@ $^
> > +
> > +$(OUTPUT)/main.o: main.c
> > +	$(CC) $(HOST_CFLAGS) -c $< -o $@
> 
> .o files don't have to be generated/kept. And to be consistent with other
> selftests, please don't generate/keep them.

AFAIK there is no rule that .o files can't be generated when it makes
sense.

In your other comment you correctly pointed out that "-I$(OUTPUT)" was
missing when compiling encl_piggy.S. However, it is required neither
main.c nor sgx_call.c, and thus should not be used there.

The consequences are:

1. The enclave can and should be compiled like you suggest here.
2. The enclave hosting program must be compiled as it has been.

/Jarkko