linux-kernel - Re: [PATCH V2 01/15] selftests/x86/sgx: Fix a benign linker warning

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Message-ID: <YXwLgAdOA1jlsSiq@google.com>
Date:   Fri, 29 Oct 2021 14:56:00 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Reinette Chatre <reinette.chatre@...el.com>, jarkko@...nel.org,
        linux-sgx@...r.kernel.org, shuah@...nel.org,
        dave.hansen@...ux.intel.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 01/15] selftests/x86/sgx: Fix a benign linker warning

On Thu, Oct 28, 2021, Dave Hansen wrote:
> On 10/28/21 1:37 PM, Reinette Chatre wrote:
> > From: Sean Christopherson <sean.j.christopherson@...el.com>
> > 
> > Pass a build id of "none" to the linker to suppress a warning about the
> > build id being ignored:
> > 
> >   /usr/bin/ld: warning: .note.gnu.build-id section discarded, --build-id
> >   ignored.
> 
> Do we have a good grasp on why this is producing a warning in the first
> place?  This seems like something that could get merged quickly with one
> more sentence in the changelog.

The SGX selftests use a custom linker script, tools/testing/selftests/sgx/test_encl.lds,
to configure the resulting enclave binary so that it's loadable as an enclave
more or less as-is.  One of the things the script does is drop sections the
selftests doesn't want, .note* sections being in that category.  I don't recall
exactly why the script drops sections; I assume it's to simply the loading process.
Anyways, .note.gnu.build-id is collateral damage and the linker complains.