linux-kernel - Re: [PATCH v5 05/13] selftests/sgx: Specify freestanding environment for enclave compilation

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Message-ID: <ae25b34b901b8cee6e6e186fe5ddc739baab1db1.camel@intel.com>
Date:   Thu, 31 Aug 2023 23:15:43 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Van Bulck, Jo" <jo.vanbulck@...kuleuven.be>
CC:     "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v5 05/13] selftests/sgx: Specify freestanding environment
 for enclave compilation

On Thu, 2023-08-31 at 15:41 +0200, Jo Van Bulck wrote:
> Use -ffreestanding to assert the enclave compilation targets a
> freestanding environment (i.e., without "main" or standard libraries).
> This fixes clang reporting "undefined reference to `memset'" after
> erroneously optimizing away the provided memset/memcpy implementations.
> 
> Still need to instruct the linker from using standard system startup
> functions, but drop -nostartfiles as it is implied by -nostdlib.
> 
> Signed-off-by: Jo Van Bulck <jo.vanbulck@...kuleuven.be>
> Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

Acked-by: Kai Huang <kai.huang@...el.com>