[PATCH] riscv: uapi: Lie about having futex()

[Andreas Schwab]

On Jan 19 2023, Palmer Dabbelt wrote:

> diff --git a/arch/riscv/include/asm/unistd.h b/arch/riscv/include/asm/unistd.h
> index 221630bdbd07..26116686690a 100644
> --- a/arch/riscv/include/asm/unistd.h
> +++ b/arch/riscv/include/asm/unistd.h
> @@ -24,3 +24,11 @@
>  #include <uapi/asm/unistd.h>
>  
>  #define NR_syscalls (__NR_syscalls)
> +
> +/*
> + * Userspace (at least libstdc++) has come to expect SYS_futex, but we only
> + * have SYS_futex_time64 on rv32.  So just lie.
> + */
> +#ifndef __LP64__
> +#define __NR_futex __NR_futex_time64
> +#endif

This is not a uapi file, so why does this have any influence on
libstdc++?

-- 
Andreas Schwab, schwab at linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."