Bug#962518: cegui-mk2 FTBFS on mipsel/mips64el: symbol differences

[Stephen Kitt]

On Tue, 9 Jun 2020 21:08:25 +0100, Simon McVittie <smcv at debian.org> wrote:
> On Tue, 09 Jun 2020 at 15:21:37 -0400, Olek Wojnar wrote:
> > On Tue, Jun 9, 2020 at 6:12 AM Adrian Bunk <[1]bunk at debian.org> wrote:  
> >     > I wonder if the real fix shouldn't be for cegui-mk2 to stop
> >     > exporting a  
> >     pile  
> >     > of Boost symbols...  
> > 
> > 
> > I would love that. Any advice on a reasonably easy/straightforward way of
> > doing that?  
> 
> *If* your upstream is on board with this, my understanding is that
> the main way to do this is to build with -fvisibility=hidden,
> and decorate each intentionally-public class/function/thing
> with a macro that (when building with gcc or clang) expands to
> __attribute__((__visibility__("hidden"))).
> 
> Some upstreams will be doing something similar already, because they are
> portable to Windows and need to decorate public symbols with
> __declspec(dllexport) on Windows.

See
https://salsa.debian.org/debian/fcml/-/blob/master/debian/patches/visibility.patch
for a quick-and-dirty example of both of these approaches (and
https://salsa.debian.org/debian/fcml/-/commit/22d753b1c820ea339b6b52cbc1cdf6e05229fbf9#34a4bacbb5ecf973fa5f481819228c77da389f43
for the resulting symbols file simplification).

Regards,

Stephen
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