This would also be relevant for Tor; as they would like to disable
direct UDP and TCP IPC mechanisms:


On Thu, Dec 13, 2018 at 4:45 PM <> wrote:
>    TL;DR: Is there a way to make a "manages" declaration conditional, for 
> protocols that depend on types that might not be defined for certain 
> build-flags?
>    I ask because I am working on a protocol that fulfills webrtc's networking 
> needs (PMediaTransport), but webrtc can be disabled as a whole with the 
> --disable-webrtc build flag. PMediaTransport uses many types that aren't 
> defined when webrtc is disabled. I have tried the following approaches so far:
> 1. Export a mostly-empty dummy version of PMediaTransport instead of the real 
> one when webrtc is disabled. This gets me an "error: |manager| declaration in 
> protocol `PMediaTransport' does not match any |manages| declaration in 
> protocol `PSocketProcessBridge'", even after a clobber. If I remove the 
> "real" PMediaTransport from the tree, this approach works. It seems that ipdl 
> files are processed in-tree (at least partially) instead of in exports.
> 2. Make sure the types PMediaTransport depends on are always defined. This 
> ends up pulling in a ton more webrtc-only code that these types depend on, 
> which is not ideal.
> The next thing for me to try is to typedef all of these undefined types to 
> int or similar when webrtc is disabled, but I was wondering if there was a 
> way to make a "manages" conditional on build-flags?
> Best regards,
> Byron Campen
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