linux-kernel - Re: [PATCH v1 1/1] selftests/sgx: Fix the implicit declaration of asprintf() compiler error

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Date: Fri, 10 May 2024 13:52:09 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Mirsad Todorovac <mtodorovac69@...il.com>,
	<linux-kselftest@...r.kernel.org>
CC: Jarkko Sakkinen <jarkko@...nel.org>, Dave Hansen
	<dave.hansen@...ux.intel.com>, Shuah Khan <shuah@...nel.org>,
	<linux-sgx@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Edward Liaw
	<edliaw@...gle.com>
Subject: Re: [PATCH v1 1/1] selftests/sgx: Fix the implicit declaration of
 asprintf() compiler error

On 5/10/24 1:37 PM, Mirsad Todorovac wrote:
..
> The fix defines __USE_GNU before including <stdio.h> in case it isn't already
> defined. After this intervention the module compiles OK.

Instead of interventions, I believe the standard way to do this is to simply
define _GNU_SOURCE before including the header file(s). For example, the
following also fixes the compilation failure on Ubuntu:

diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c
index 9820b3809c69..bb6e795d06e2 100644
--- a/tools/testing/selftests/sgx/main.c
+++ b/tools/testing/selftests/sgx/main.c
@@ -1,6 +1,7 @@
  // SPDX-License-Identifier: GPL-2.0
  /*  Copyright(c) 2016-20 Intel Corporation. */
  
+#define _GNU_SOURCE
  #include <cpuid.h>
  #include <elf.h>
  #include <errno.h>


However, that's not required, because Edward Liaw is already on v4 of
a patchset[1] that fixes up the _GNU_SOURCE problem for all selftests.

[1] https://lore.kernel.org/all/20240510000842.410729-2-edliaw@google.com/

thanks,
-- 
John Hubbard
NVIDIA