VCPKG adding conditional dependency

Question

I have a custom port that can require 1 of 4 incompatible dependencies, Is there a way to sensibly do this using VCPKG? So that it is clear in the .json why I am using a particular dependency?

Where I have 2 alternate bare-metal dependencies that can change based on the exact arm processor used.

And I have the 3rd/4th option which are on an rtos platform using 1/2 different arm processors.

"name": "some-dependency"
"version": "0.4.0",
"dependencies": [
   "dep1",
   {
      "name": "dep2a",
      "platform" : "bare-metal & cortex-a7" // Something like this would be nice, but doesn't work.
   },
   {
      "name": "dep2b",
      "platform" : "bare-metal & cortex-a8" //Something like this would be nice, but doesn't work.
   },
   {
      "name": "dep2c",
      "platform" : "freertos"
   },
   {
     "name": "vcpkg-cmake",
     "host": true
   },
   {
     "name": "vcpkg-cmake-config",
     "host": true
   }
]

@Osyotr is there a way to do that and make it clear that they are mutually exclusive.. IE if I included feature 1 & Feature 2 I want an error message that says "Cannot use Feature 1/ Feature 2 at the same time"... — Questor
– Questor, Commented Nov 18, 2024 at 19:36
Hmm I think it's possible to add your own platform expressions using VCPKG_DEP_INFO_OVERRIDE_VARS learn.microsoft.com/en-us/vcpkg/users/…. — Osyotr
– Osyotr, Commented Nov 18, 2024 at 21:25
That is a great find! Make that an answer and it has my vote. — Questor
– Questor, Commented Nov 18, 2024 at 21:48

Osyotr · Accepted Answer · 2024-11-19 11:38:25Z

2

There's a triplet variable VCPKG_DEP_INFO_OVERRIDE_VARS (docs) that allows you to override the default set of terms used for platform expression evaluation.

In custom triplet:

set(VCPKG_DEP_INFO_OVERRIDE_VARS "bare-metal;cortex-a7")

In vcpkg manifest:

"dependencies": [
  {
    "name": "dep2a",
    "platform" : "bare-metal & cortex-a7"
  }
]

PS: I've assumed that you've meant bare-metal & cortex-a7 instead of bare-metal | coretex-a7. If not, just drop bare-metal from the triplet.

answered Nov 19, 2024 at 11:38

Osyotr

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