[yocto] [meta-mono][PATCH] mono-4.xx: compiling mono 4 with btls requires cmake

[Pascal Bach]

>>>
>>> Mono requires cmake to build the bundled BoringSSL library. I didn't look why it works in detail but I currently assume that BoringSSL is standalone enough that no additional
>>> CMake toolchain settings are required to make it work.
>>>
>> yeah that probably is a case of bundling which is on rise at app level
>> these days,
>>
>>> One option would be to disable it with `--disable-btls` but I fear that would disable TLS1.2 support (http://www.mono-project.com/docs/about-mono/releases/4.8.0/#tls-12-support).
>>> But I have no way of checking that.
>>>
>> interesting, do they support any other TLS implementations ?
>>
>
> It is disabled in 5.x builds by default as it breaks the build e.g.
>
> http://git.yoctoproject.org/cgit/cgit.cgi/meta-mono/tree/recipes-mono/mono/mono-5.4.0.201.inc
>
> It's probably time to look at a working build with it re-enabled. Patches welcomed...
>
> (I did have a quick look at inheriting cmake but that breaks the build too)
>
I did some more testing. And adding "cmake-native" still doesn't build btls. I guess it need cmake to figure that out. But this means it was never enabled in the first place.

So my proposal for the moment is to explicitly set "--disable-btls" for Mono 4 too, this way it builds and it is clear that it is disabled.

If somebody figures out how to enable it again. I will send an updated Patch.

Pascal