Re: [PATCH 037/143] meson: add qemu-bridge-helper

[Paolo Bonzini]

On 07/08/20 15:20, Philippe Mathieu-Daudé wrote:
>>    endif
>>  
>> +  if host_machine.system() == 'linux'
>> +    executable('qemu-bridge-helper', files('qemu-bridge-helper.c'),
>> +               dependencies: [qemuutil, libcap_ng],
> Is libcap_ng still optional?
> 

Yes, if a dependency is absent it is simply left out.  See
contrib/vhost-user-scsi for an example where the executable is disabled.

Instead, if you want a dependency to be mandatory you have two choices:

- to break the build you use "required: true", see the SDL conversion
for an example

- to disable executables there is a thing called disabler but we're not
using it because it's confusing.  I was thinking of adding an
"or_disable()" method to dependency objects, but I have never
contributed it.

Paolo