[LAD] G++ trouble

[Alexandre DENIS]

On Mon, 16 Nov 2020 13:38:01 +0000
Will J Godfrey <WillGodfrey at musically.me.uk> 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.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 488 bytes
Desc: OpenPGP digital signature
URL: <https://lists.linuxaudio.org/archives/linux-audio-dev/attachments/20201116/8387af3a/attachment.sig>