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

[Cecil Ward]

In GDC and LDC’s inline asm syntax, the main asm part is 
separated from the constraints block by the first colon that 
begins the ‘outputs’ section. My question: how does GDC / LDC / 
GCC parse the first part, given that there can be umpteen kinds 
of assembler language. Is the parsing asm dialect-specific so 
that a full parse finds the first significant colon ?

If not and the very first colon (outside double-quoted strings 
and comments) ends the first section, which is how I parse it, 
then there is a problem, as labels contain colons. And so I have 
a bug in my gramma for my kludge asm section parser, see thread 
elsewhere.

About labels then, is a label the only place a non 
section-terminator colon can occur?

A label doesn’t have a colon before the name, but after it, is 
that correct for ATT asm dialect? If so, I could check for a 
newline plus optional whitespace required before any colon if it 
is to be recognised as a section terminator and the beginning of 
the constraints.