Broken RISC-V code in newlib

[Eric Salem]

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.

> jeff
>