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    SubjectRe: [PATCH v6 05/19] arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64
    On Wed, Nov 18, 2015 at 12:16:45AM +0300, Yury Norov wrote:
    > diff --git a/arch/arm64/include/uapi/asm/bitsperlong.h b/arch/arm64/include/uapi/asm/bitsperlong.h
    > index fce9c29..4265243 100644
    > --- a/arch/arm64/include/uapi/asm/bitsperlong.h
    > +++ b/arch/arm64/include/uapi/asm/bitsperlong.h
    > @@ -16,7 +16,14 @@
    > #ifndef __ASM_BITSPERLONG_H
    > #define __ASM_BITSPERLONG_H
    >
    > -#define __BITS_PER_LONG 64
    > +#if defined(__LP64__)
    > +/* Assuming __LP64__ will be defined for native ELF64's and not for ILP32. */
    > +# define __BITS_PER_LONG 64
    > +#elif defined(__ILP32__)
    > +# define __BITS_PER_LONG 32
    > +#else
    > +# error "Neither LP64 nor ILP32: unsupported ABI in asm/bitsperlong.h"
    > +#endif

    Quick question: IIRC, earlier aarch64 gcc versions did not generate
    __ILP32__ when -mabi=ilp32, they only removed __LP64__. When did the
    change happen? Could we assume that all compiler versions used to
    generate ILP32 would define this?

    --
    Catalin


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