Re: [Tinycc-devel] To document "-l" option clearer

[Thomas Preud'homme]

Le dimanche 29 juin 2014, 04:56:59 YX Hao a écrit :
> Hi,
> 
> "Usage: tcc [options...] [-o outfile] [-c] infile(s)..."
> 
> Is "-l" option must follow the infile(s)? Yes! I tried different positions.
> Before, "undefined symbol" error; behind, ok. Because of I had forgotten
> it. Usually, a library is appended by reviewing.
> 
> I searched and found the reason out. A linker only adds the undefined
> symbols that the (previous) existing program codes need.

Indeed, it works this way in all compilers. The advantage is that a library is 
not pulled in if none of its symbol is used.

> 
> It is a trick that experienced one knows (usage format from gcc). If the
> usage is organized in a clearer way, it may be better. How to do it simple
> and clear?

I don't think usage can renders this appropriately. After all it can be put 
anywhere, it's just that its position matters. The manual should mention it 
though, as is done in GCC:

"It makes a difference where in the command you write this option; the linker 
searches and processes libraries and object files in the order they are 
specified.  Thus, foo.o -lz bar.o searches library z after file foo.o but 
before 
bar.o.  If bar.o refers to functions in z, those functions may not be loaded."

Best regards,

Thomas

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