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	Wed, 15 Nov 2023 15:21:04 -0800 (PST)
Message-ID:	<95d6be1b-d172-4712-8c9a-5242d74f3e8b@draconx.ca>
Date:	Wed, 15 Nov 2023 18:21:03 -0500
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From:	"Nick Bowler (nbowler AT draconx DOT ca) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject:	Re: [geda-user] anyone successfully built gerbv lately?
To:	geda-user AT delorie DOT com
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On 2023-11-15 17:37, Britton Kerin (britton DOT kerin AT gmail DOT com) [via 
geda-user AT delorie DOT com] wrote:
> I've been rebuilding on new laptop and was relieved after recent
> discussions to find that gschem and pcb rebuild fine on the latest
> Ubuntu LTS.
> 
> gerbv isn't building though.  I don't use it a lot but it's a nice way
> to take a final look at gerbers.
> Has anyone built it lately?
> 
> Here is how it fails:
> 
> $ make
[snip]
> /usr/bin/ld: interface.o:/home/bkerin/projects/geda_full_stack/gerbv-2.7.0/src/callbacks.h:50:
> multiple definition of `toggle_layer'

Yes, this header defines some global variables and modern gcc no longer 
follows traditional practice of (by default) creating common symbols for 
these (which hides the multiple definition problem).  So on current 
versions you will see this error.

As a workaround, you can compile with CC='gcc -fcommon' to restore the 
traditional behaviour.

Or just remove the definitions, as the variable definitions appear to 
just be mistakes (they are not referenced anywhere in the code):

--- src/callbacks.h~
+++ src/callbacks.h
@@ -41,13 +41,13 @@
 	CALLBACKS_SAVE_LAYER_AS,
 	CALLBACKS_SAVE_FILE_IDRILL
 	
-} CALLBACKS_SAVE_FILE_TYPE;
+};
 
 enum {
 	LAYER_SELECTED =	-1,
 	LAYER_ALL_ON =		-2,
 	LAYER_ALL_OFF =		-3,
-} toggle_layer;
+};
 
 void
 callbacks_new_project_activate                (GtkMenuItem     *menuitem,

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