Bug#909740: libsdl2-dev: No longer multi-arch co-installable

[Adrian Bunk]

On Sun, Sep 30, 2018 at 07:08:26PM +0100, Simon McVittie wrote:
>...
> I prefer this approach because it's relatively self-contained, and
> doesn't require us to carry non-upstreamable patches to upstream code
> or rely on a relatively obscure Debian-specific compiler option.
> 
> The alternative would be to modify the build system so that
> at least SDL_config.h (and possibly all the headers) are in
> /usr/include/<triplet>/SDL2, arrange for the pkg-config metadata to
> include -I/usr/include/<triplet>/SDL2 (and possibly /usr/include/SDL2)
> in the Cflags, and arrange for sdl2-config to output the same CFLAGS as
> <triplet>-pkg-config without itself having architecture-varying content,
> most likely by using a `cc -print-multiarch` trick similar to the one
> Hugh suggested.
>...

Wouldn't the least invasive option be a combination of
1. my --includedir=\$${prefix}/include/$(DEB_HOST_MULTIARCH) suggestion plus
2. the sdl2-config patching from Hugh

When doing 1. the build system will use the correct paths in the 
pkg-config and cmake files.

The only remaining issue would be sdl2-config, and this would be covered 
by 2.

This sounds better to me than adding some Debian-specific header.

It would move all headers under the multiarch location, but 1.5 MB 
diskspace additional usage are a non-issue for someone compiling for 
more than one architecture.

Anything I miss here?

cu
Adrian

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