Re: [PATCH] elf.h: Drop duplicate DT_RISCV_VARIANT_CC

[Palmer Dabbelt <palmer@rivosinc.com>]

On Fri, 28 Apr 2023 12:04:51 PDT (-0700), maskray@google.com wrote:
> On 2023-04-28, Palmer Dabbelt wrote:
>>I missed the update from last year that included these already, having
>>duplicates breaks the build due to redefinition errors like
>>
>>    elf/elf.h:4013: error: macro STO_RISCV_VARIANT_CC redefined
>>    elf.h:3941: note: location of previous definition
>>
>>Reported-by: Joseph S. Myers <joseph@codesourcery.com>
>>Fixes: 117e8b341c ("riscv: Resolve symbols directly for symbols with STO_RISCV_VARIANT_CC.")
>>Link: https://inbox.sourceware.org/libc-alpha/mhng-0d9fb5a0-63fa-4b02-8029-7c20232f39ee@palmer-ri-x1c9/T/#t
>>Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
>>---
>>bulid-many-glibcs is still churning and might take a bit, but looks like
>>this was just a silly mistake on my end.  I'm pretty confident this
>>fixes the issue, but happy to wait for the tests to finish given that I
>>just screwed this up.  That was before coffee, though, so maybe I can
>>avoid some of the blame... ;)
>>---
>> elf/elf.h | 7 -------
>> 1 file changed, 7 deletions(-)
>>
>>diff --git a/elf/elf.h b/elf/elf.h
>>index 4f65b5a32d..94ca23c1bb 100644
>>--- a/elf/elf.h
>>+++ b/elf/elf.h
>>@@ -3933,13 +3933,6 @@ enum
>>
>> #define R_TILEGX_NUM		130
>>
>>-/* RISC-V specific values for the Dyn d_tag field.  */
>>-#define DT_RISCV_VARIANT_CC	(DT_LOPROC + 1)
>>-#define DT_RISCV_NUM		2
>
> We probably should keep DT_RISCV_NUM. There is just one definition.

Ya, thanks.  I'm not sure why I was being an idiot yesterday, but I took 
a nap and hopefully things will be better today.

>
>>-/* RISC-V specific values for the st_other field.  */
>>-#define STO_RISCV_VARIANT_CC 0x80
>
> The convention appears to place DT_ STO_ definitions after R_
> definitions for a particular processor.
> I'd suggest that we move the definitions below R_ while keeping just one
> copy.

Seems reasonable.  I've just sent a v2.

>> /* RISC-V ELF Flags */
>> #define EF_RISCV_RVC 			0x0001
>> #define EF_RISCV_FLOAT_ABI 		0x0006
>>--
>>2.40.0
>>