Broken RISC-V code in newlib

[Eric Salem]

Hi Jeff,

On 3/25/25 8:40 AM, Jeff Law wrote:
> 
> You recently put a typedef into libc/machine/riscv/sys/asm.h as well as including stdint.h.
> 
> That breaks code such as strcmp.S which includes sys/asm.h, but is processed by the assembler after pre-processing:
> 
>>   CPPAS    libc/machine/riscv/libc_a-strcmp.o
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h: Assembler messages:
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:41: Error: unrecognized opcode `typedef signed char __int8_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:43: Error: unrecognized opcode `typedef unsigned char __uint8_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:55: Error: unrecognized opcode `typedef short int __int16_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:57: Error: unrecognized opcode `typedef short unsigned int __uint16_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:77: Error: unrecognized opcode `typedef int __int32_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:79: Error: unrecognized opcode `typedef unsigned int __uint32_t'
> [ ... ]
> 
>>   CPPAS    libc/machine/riscv/libc_a-setjmp.o
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h: Assembler messages:
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:41: Error: unrecognized opcode `typedef signed char __int8_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:43: Error: unrecognized opcode `typedef unsigned char __uint8_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:55: Error: unrecognized opcode `typedef short int __int16_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:57: Error: unrecognized opcode `typedef short unsigned int __uint16_t'
>> /home/jlaw/jenkins/workspace/riscv64-elf/newlib-cygwin/newlib/libc/include/machine/_default_types.h:77: Error: unrecognized opcode `typedef int __int32_t'
> 
> 
> 
> Those two failures make it appear that this change has not been tested at all.

That's strange because I compiled everything during testing and didn't get any errors. I'll send an updated patch for it.

> 
> And it looks like you busted strcpy as well.  This probably only fails with gcc-15 as gcc-15 defaults to c23 where implicit declarations are flagged as hard errors:
> 
>>  CC       libc/machine/riscv/libc_a-strcpy.o
>> ../../../..//newlib-cygwin/newlib/libc/machine/riscv/strcpy.c: In function 'strcpy':
>> ../../../..//newlib-cygwin/newlib/libc/machine/riscv/strcpy.c:17:10: error: implicit declaration of function '__libc_strcpy'; did you mean '__builtin_strcpy'? [-Wimplicit-function-declaration]
>>    17 |   return __libc_strcpy(dst, src, true);
>>       |          ^~~~~~~~~~~~~
>>       |          __builtin_strcpy
>> ../../../..//newlib-cygwin/newlib/libc/machine/riscv/strcpy.c:17:10: error: returning 'int' from a function with return type 'char *' makes pointer from integer without a cast [-Wint-conversion]
>>    17 |   return __libc_strcpy(dst, src, true);
>>       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> And stpcpy:
>>   CC       libc/machine/riscv/libc_a-stpcpy.o
>> ../../../..//newlib-cygwin/newlib/libc/machine/riscv/stpcpy.c: In function 'stpcpy':
>> ../../../..//newlib-cygwin/newlib/libc/machine/riscv/stpcpy.c:6:10: error: implicit declaration of function '__libc_strcpy'; did you mean '__builtin_strcpy'? [-Wimplicit-function-declaration]
>>     6 |   return __libc_strcpy(dst, src, false);
>>       |          ^~~~~~~~~~~~~
>>       |          __builtin_strcpy
>> ../../../..//newlib-cygwin/newlib/libc/machine/riscv/stpcpy.c:6:10: error: returning 'int' from a function with return type 'char *' makes pointer from integer without a cast [-Wint-conversion]
>>     6 |   return __libc_strcpy(dst, src, false);
>>       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> make[1]: *** [Makefile:34809: libc/machine/riscv/libc_a-stpcpy.o] Error 1

Those files are including string.h but it maybe in this case it included the system header instead of the local one. I'll take a look.

Thanks for the heads up.

> 
> 
> 
> Jeff