From e6cd4bb59b8154fa00da611200beef7eb4e8ec56 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Wed, 15 Aug 2018 16:31:47 -0700 Subject: tcg: Split CONFIG_ATOMIC128 GCC7+ will no longer advertise support for 16-byte __atomic operations if only cmpxchg is supported, as for x86_64. Fortunately, x86_64 still has support for __sync_compare_and_swap_16 and we can make use of that. AArch64 does not have, nor ever has had such support, so open-code it. Reviewed-by: Emilio G. Cota Signed-off-by: Richard Henderson --- include/qemu/compiler.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include/qemu/compiler.h') diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index 66f8c241dc..6b92710487 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -146,6 +146,17 @@ # define QEMU_FLATTEN #endif +/* + * If __attribute__((error)) is present, use it to produce an error at + * compile time. Otherwise, one must wait for the linker to diagnose + * the missing symbol. + */ +#if __has_attribute(error) +# define QEMU_ERROR(X) __attribute__((error(X))) +#else +# define QEMU_ERROR(X) +#endif + /* Implement C11 _Generic via GCC builtins. Example: * * QEMU_GENERIC(x, (float, sinf), (long double, sinl), sin) (x) -- cgit v1.2.3-55-g7522