Question about GCC / GDC / LDC syntax of inline asm advanced

[Iain Buclaw]

On Friday, 7 July 2023 at 15:25:32 UTC, Cecil Ward wrote:
> On Friday, 7 July 2023 at 12:18:47 UTC, Cecil Ward wrote:
>> On Friday, 7 July 2023 at 11:39:44 UTC, Iain Buclaw wrote:
>>> [...]
>>
>> Many thanks Iain. I am not doing a full parse so I shall 
>> simply have to warn the user that the ternary operator must be 
>> resolved at ctfe before I get the resulting string, and 
>> otherwise I have to forbid it, because for me, aside from 
>> detecting labels, I am treating colon as a section terminator. 
>> My kludge. But I don’t have months to spend.
>
> Iain, what’s the lex syntax for a label in the asm ? is it 
> always alphanum+ ‘:’ - something like that?

Where is the label being referenced/defined from?

Within the asm insn string? [GNU As documents it 
as](https://sourceware.org/binutils/docs/as/Symbol-Names.html):

     [A-Za-z._][0-9A-Za-z._]+

For a label referenced from an asm statement (goto labels 
section)? Then it's the same as any other D 
[Identifier](https://dlang.org/spec/lex.html#Identifier) - same 
as above, but also includes unicode alpha characters.