Re: [LAD] G++ trouble

On Mon, 16 Nov 2020 13:38:01 +0000
Will J Godfrey <WillGodfrey@email-addr-hidden> wrote:

> Not wishing to hijack this thread but I'm still confused :(
>
> I just did a search of the whole of src. It's *used* about a dozen
> times across 5 otherwise unrelated .cpp files, but is only defined
> here. Just to be certain, I did a make clean before trying this
> again, and it's definitely saying multiple defs
>
> e.g
> /usr/bin/ld:
> CMakeFiles/yoshimi.dir/UI/WidgetMWSlider.cpp.o:(.rodata+0x0):
> multiple definition of `ADD_COLOUR';
> CMakeFiles/yoshimi.dir/Interface/InterChange.cpp.o:(.rodata+0x1840):
> first defined here
>
> This happens at the linker stage.
>
> Also, I thought the whole idea of putting things like this in a
> #ifndef/#def block was to ensure it was only set once.
>

It is only set once *per file* which includes the header. But since the
symbol is extern, the linker sees one public copy per file, which
conflict with each other.

-a.

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