[lttng-tools.git] / src / common / compiler.hpp

/*
 * Copyright (C) 2023 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#ifndef LTTNG_COMPILER_HPP
#define LTTNG_COMPILER_HPP

/*
 * A bug in gcc [6.1, 7.4] causes flexible array members to generate a destructor
 * for compound types. In turn, this makes any type that contains a flexible array
 * a non-POD object which is a problem under some use-case (e.g., being allocated
 * using C-style memory management facilities).
 *
 * Explicitly specifying a length of zero works around this bug, see:
 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70932
 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71147
 */
#if !defined(__clang__) && defined(__GNUC__) && \
	((__GNUC__ == 6 && __GNUC_MINOR__ >= 1) || ((__GNUC__ == 7 && __GNUC_MINOR__ <= 4)))
#define LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH 0
#else
#define LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH
#endif /* gcc version [6.1, 7.4]. */

#endif /* LTTNG_COMPILER_HPP */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2023 Jérémie Galarneau <jeremie.galarneau@efficios.com>
	3	*
	4	* SPDX-License-Identifier: LGPL-2.1-only
	5	*
	6	*/
	7
	8	#ifndef LTTNG_COMPILER_HPP
	9	#define LTTNG_COMPILER_HPP
	10
	11	/*
	12	* A bug in gcc [6.1, 7.4] causes flexible array members to generate a destructor
	13	* for compound types. In turn, this makes any type that contains a flexible array
	14	* a non-POD object which is a problem under some use-case (e.g., being allocated
	15	* using C-style memory management facilities).
	16	*
	17	* Explicitly specifying a length of zero works around this bug, see:
	18	* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70932
	19	* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71147
	20	*/
	21	#if !defined(__clang__) && defined(__GNUC__) && \
	22	((__GNUC__ == 6 && __GNUC_MINOR__ >= 1) \|\| ((__GNUC__ == 7 && __GNUC_MINOR__ <= 4)))
	23	#define LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH 0
	24	#else
	25	#define LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH
	26	#endif /* gcc version [6.1, 7.4]. */
	27
	28	#endif /* LTTNG_COMPILER_HPP */