Commit f4f09dd7 authored by Jakob Olesen's avatar Jakob Olesen Committed by Kumar Gala
Browse files

toolchain: Define a HAS_BUILTIN(x) macro in toolchain.h. 



Compilers based on Clang provide a __has_builtin(x) macro which can be
used to detect in the preprocessor if a given builtin function is
supported by the compiler.

For other compilers (notably GCC), we provide an alternative definition
of HAS_BUILTIN(x) that depends on the toolchain-specific header file to
declare which builtin functions are supported based on the current
compiler version.

Signed-off-by: default avatarJakob Olesen <jolesen@fb.com>
parent e66c0da0

include/toolchain.h

+18 −0
Original line number Diff line number Diff line
@@ -15,6 +15,24 @@ 
#ifndef ZEPHYR_INCLUDE_TOOLCHAIN_H_

#define ZEPHYR_INCLUDE_TOOLCHAIN_H_



/**

 * @def HAS_BUILTIN(x)

 * @brief Check if the compiler supports the built-in function \a x.

 *

 * This macro is for use with conditional compilation to enable code using a

 * builtin function that may not be available in every compiler.

 */

#ifdef __has_builtin

#define HAS_BUILTIN(x) __has_builtin(x)

#else

/*

 * The compiler doesn't provide the __has_builtin() macro, so instead we depend

 * on the toolchain-specific headers to define HAS_BUILTIN_x for the builtins

 * supported.

 */

#define HAS_BUILTIN(x) HAS_BUILTIN_##x

#endif



#if defined(__XCC__)

#include <toolchain/xcc.h>

#elif defined(__GNUC__) || (defined(_LINKER) && defined(__GCC_LINKER_CMD__))

include/toolchain/gcc.h

+16 −0
Original line number Diff line number Diff line
@@ -152,6 +152,22 @@ do { \ 
#endif

#define __unused __attribute__((__unused__))



/* Builtins with availability that depend on the compiler version. */

#if __GNUC__ >= 5

#define HAS_BUILTIN___builtin_add_overflow 1

#define HAS_BUILTIN___builtin_sub_overflow 1

#define HAS_BUILTIN___builtin_mul_overflow 1

#define HAS_BUILTIN___builtin_div_overflow 1

#endif

#if __GNUC__ >= 4

#define HAS_BUILTIN___builtin_clz 1

#define HAS_BUILTIN___builtin_clzl 1

#define HAS_BUILTIN___builtin_clzll 1

#define HAS_BUILTIN___builtin_ctz 1

#define HAS_BUILTIN___builtin_ctzl 1

#define HAS_BUILTIN___builtin_ctzll 1

#endif



/* Be *very* careful with this, you cannot filter out with -wno-deprecated,

 * which has implications for -Werror

 */

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