[mirror_ubuntu-bionic-kernel.git] / include / linux / compiler-clang.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_COMPILER_TYPES_H
#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
#endif

/* Some compiler specific definitions are overwritten here
 * for Clang compiler
 */

#ifdef uninitialized_var
#undef uninitialized_var
#define uninitialized_var(x) x = *(&(x))
#endif

/* same as gcc, this was present in clang-2.6 so we can assume it works
 * with any version that can compile the kernel
 */
#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)

#undef __no_sanitize_address
#define __no_sanitize_address __attribute__((no_sanitize("address")))

/* Clang doesn't have a way to turn it off per-function, yet. */
#ifdef __noretpoline
#undef __noretpoline
#endif

/*
 * Not all versions of clang implement the the type-generic versions
 * of the builtin overflow checkers. Fortunately, clang implements
 * __has_builtin allowing us to avoid awkward version
 * checks. Unfortunately, we don't know which version of gcc clang
 * pretends to be, so the macro may or may not be defined.
 */
#undef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW
#if __has_builtin(__builtin_mul_overflow) && \
    __has_builtin(__builtin_add_overflow) && \
    __has_builtin(__builtin_sub_overflow)
#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
d1515582	2	#ifndef __LINUX_COMPILER_TYPES_H
565cbdc2 MC	3	#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
	4	#endif
	5
	6	/* Some compiler specific definitions are overwritten here
	7	* for Clang compiler
	8	*/
	9
	10	#ifdef uninitialized_var
	11	#undef uninitialized_var
	12	#define uninitialized_var(x) x = *(&(x))
	13	#endif
b41c29b0 AB	14
	15	/* same as gcc, this was present in clang-2.6 so we can assume it works
	16	* with any version that can compile the kernel
	17	*/
	18	#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
4ca59b14	19
a4fce118 AK	20	#undef __no_sanitize_address
	21	#define __no_sanitize_address __attribute__((no_sanitize("address")))
	22
79a1bd31 DW	23	/* Clang doesn't have a way to turn it off per-function, yet. */
	24	#ifdef __noretpoline
	25	#undef __noretpoline
	26	#endif
a8b18c24 RV	27
	28	/*
	29	* Not all versions of clang implement the the type-generic versions
	30	* of the builtin overflow checkers. Fortunately, clang implements
	31	* __has_builtin allowing us to avoid awkward version
	32	* checks. Unfortunately, we don't know which version of gcc clang
	33	* pretends to be, so the macro may or may not be defined.
	34	*/
	35	#undef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW
	36	#if __has_builtin(__builtin_mul_overflow) && \
	37	__has_builtin(__builtin_add_overflow) && \
	38	__has_builtin(__builtin_sub_overflow)
	39	#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
	40	#endif