Re: [Tinycc-devel] Unify C and asm symbols

[Michael Matz]

On Tue, 28 Nov 2017, grischka wrote:

> I like it.  More lines removed than added could mean that it is going in 
> the right direction anyway ;)

Hehe :)

> Question:  I wonder whether now we could maybe get rid of the asm label
> "post-processing" (asm_free_labels) and the asm_label stack altogether?

That requires surgery in how linking is done (in a sense moving that 
post-processing from asm symbols from compilation to linking time).  I 
believe this ultimately will be good anyway, as there are currently 
various strangenesses and corner cases that are buggy especially involving 
multi-file compilation (i.e. without intermediate .o files), or multi-file 
-run.  I think I'll work on that somewhen the next days, but it'll be a 
bit hairy and potentially disruptive, so the release doesn't have to wait. 
In the meantime ...

> Seen that it can be counter-productive too, as with for example:
...
> $ tcc -c t1.c t2.c && tcc t1.o t2.o -o t.exe && t.exe
> tcc: error: undefined symbol 'x5'
>
> $ tcc -c t1.c && objdump -x t1.o
>    SYMBOL TABLE:
>    00000000 l    df *ABS*       00000000 t1.c
>    0000004a l       .text       0000001f x5
>
> Here 'x5' should have the g[lobal] binding from C.

... I have fixed this in mob with a one-liner instead :)


Ciao,
Michael.