ARM: 7822/1: add workaround for ambiguous C99 stdint.h types (09096f6a) · Commits · 戴 / test

The C99 types uintXX_t that are usually defined in 'stdint.h' are not as unambiguous on ARM as you would expect. For the types below, there is a difference on ARM between GCC built for bare metal ARM, GCC built for glibc and the kernel itself, which results in build errors if you try to build with -ffreestanding and include 'stdint.h' (such as when you include 'arm_neon.h' in order to use NEON intrinsics) As the typedefs for these types in 'stdint.h' are based on builtin defines supplied by GCC, we can tweak these to align with the kernel's idea of those types, so 'linux/types.h' and 'stdint.h' can be safely included from the same source file (provided that -ffreestanding is used). int32_t uint32_t uintptr_t bare metal GCC long unsigned long unsigned int glibc GCC int unsigned int unsigned int kernel int unsigned int unsigned long Acked by: Dave Martin <dave.martin@arm.com> Acked-by:

Nicolas Pitre <nico@linaro.org> Acked-by:

Mikael Pettersson <mikpe@it.uu.se> Signed-off-by:

Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/types.h

0 → 100644

+40 −0

Original line number	Diff line number	Diff line
		#ifndef _ASM_TYPES_H
		#define _ASM_TYPES_H

		#include <asm-generic/int-ll64.h>

		/*
		* The C99 types uintXX_t that are usually defined in 'stdint.h' are not as
		* unambiguous on ARM as you would expect. For the types below, there is a
		* difference on ARM between GCC built for bare metal ARM, GCC built for glibc
		* and the kernel itself, which results in build errors if you try to build with
		* -ffreestanding and include 'stdint.h' (such as when you include 'arm_neon.h'
		* in order to use NEON intrinsics)
		*
		* As the typedefs for these types in 'stdint.h' are based on builtin defines
		* supplied by GCC, we can tweak these to align with the kernel's idea of those
		* types, so 'linux/types.h' and 'stdint.h' can be safely included from the same
		* source file (provided that -ffreestanding is used).
		*
		* int32_t uint32_t uintptr_t
		* bare metal GCC long unsigned long unsigned int
		* glibc GCC int unsigned int unsigned int
		* kernel int unsigned int unsigned long
		*/

		#ifdef __INT32_TYPE__
		#undef __INT32_TYPE__
		#define __INT32_TYPE__ int
		#endif

		#ifdef __UINT32_TYPE__
		#undef __UINT32_TYPE__
		#define __UINT32_TYPE__ unsigned int
		#endif

		#ifdef __UINTPTR_TYPE__
		#undef __UINTPTR_TYPE__
		#define __UINTPTR_TYPE__ unsigned long
		#endif

		#endif /* _ASM_TYPES_H */

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