Broken RISC-V code in newlib

[Jeff Law]

On 3/25/25 9:20 AM, Eric Salem wrote:
> On 3/25/25 10:04 AM, Jeff Law wrote:
>> On 3/25/25 8:23 AM, Kito Cheng wrote:
>>> Hi Eric:
>>>
>>>> diff --git a/newlib/libc/machine/riscv/sys/asm.h b/newlib/libc/machine/riscv/sys/asm.h
>>>> index 0a354b220517..a9792e964ebc 100644
>>>> --- a/newlib/libc/machine/riscv/sys/asm.h
>>>> +++ b/newlib/libc/machine/riscv/sys/asm.h
>>>> @@ -12,7 +12,9 @@
>>>>    #ifndef _SYS_ASM_H
>>>>    #define _SYS_ASM_H
>>>>
>>>> +#if !__ASSEMBLER__
>>>>    #include <stdint.h>
>>>> +#endif
>>>>
>>>>    /*
>>>>     * Macros to handle different pointer/register sizes for 32/64-bit code
>>>> @@ -22,13 +24,17 @@
>>>>    # define SZREG 8
>>>>    # define REG_S sd
>>>>    # define REG_L ld
>>>> +#if !__ASSEMBLER__
>>>>    typedef uint64_t uintxlen_t;
>>>> +#endif
>>>>    #elif __riscv_xlen == 32
>>>>    # define PTRLOG 2
>>>>    # define SZREG 4
>>>>    # define REG_S sw
>>>>    # define REG_L lw
>>>> +#if !__ASSEMBLER__
>>>>    typedef uint32_t uintxlen_t;
>>>> +#endif
>>>>    #else
>>>>    # error __riscv_xlen must equal 32 or 64
>>>>    #endif
>>>
>>> Seems like sys/asm.h is not the right place to put those C typedef and
>>> also including #include <stdint.h>
>>>
>>> Could you just create a xlenint.h in newlib/libc/machine/riscv/ then
>>> include that by #include "xlenint.h" in those places you want to use?
>>>
>>> Since uintxlen_t is not defined in either standard C or RISC-V
>>> conventions, so I would like to prevent exposing that to users if
>>> possible :)
>> In fact,  the typedef really should be prefixed with underscores from a namespace pollution standpoint.  It's not OK for headers to be defining types like this.
> 
> Is the convention to prefix it with a double underscore? I'm trying to look up what's
> typically done.
Two underscores.

jeff