vcpkg support

[acidicoala]

This PR lays the groundwork for vcpkg integration. The parts of the code that are meant to be executed only when packaged via vcpkg are put behind ASMJIT_EXTERNAL flag. The support is implemented in a manner that closely mirrors asmjit's support. I have tested this configuration with asmtk port in local vcpkg repo, and it worked flawlessly. Once those changes are merged, I will open a PR in vcpkg repo with portfiles for asmtk.

This PR would be instrumental in closing #25 and microsoft/vcpkg#24359

[stevemk14ebr]

just for tracking this is required to resolve #25

[kobalicek]

Thanks, I have reviewed this and I think it's okay.

[acidicoala]

Thanks, I have reviewed this and I think it's okay.

Nice. Could you tell us what is preventing this from being merged?

[acidicoala]

I think windows-lib build is failing because OS is specified as windows-latest while c/c++ compiler is specified as vs2019 in yaml config. The windows-latest resolves to windows-2022, which bundles vs2022 rather than vs2019. I would suggest to pin the OS version to windows-2022 and compiler to vs2022 instead.

[stevemk14ebr]

The specific generator can be specified via CMakeSettings.json (alongside the CMakeLists.txt). I actually just had this exact 'visual studio not found error' locally funny enough. It was caused by my CMakeSettings.json specifying to use the vs 2019 generator, while I had vs 2022 installed. Here's an example settings file for vs 2022

{
  "configurations": [
    {
      "name": "x86-Debug",
      "generator": "Visual Studio 17 2022",
      "configurationType": "Debug",
      "buildRoot": "${projectDir}\\build32",
      "cmakeCommandArgs": "",
      "buildCommandArgs": "-m -v:minimal",
      "ctestCommandArgs": "",
      "inheritEnvironments": []
    },
    {
      "name": "x86-Release",
      "generator": "Visual Studio 17 2022",
      "configurationType": "Release",
      "buildRoot": "${projectDir}\\build32",
      "cmakeCommandArgs": "",
      "buildCommandArgs": "-m -v:minimal",
      "ctestCommandArgs": "",
      "inheritEnvironments": []
    },
    {
      "name": "x86-ReleaseWithDebInfo",
      "generator": "Visual Studio 17 2022",
      "configurationType": "RelWithDebInfo",
      "buildRoot": "${projectDir}\\build32",
      "cmakeCommandArgs": "",
      "buildCommandArgs": "-m -v:minimal",
      "ctestCommandArgs": "",
      "inheritEnvironments": []
    },
    {
      "name": "x64-Debug",
      "generator": "Visual Studio 17 2022 Win64",
      "configurationType": "Debug",
      "buildRoot": "${projectDir}\\build64",
      "cmakeCommandArgs": "",
      "buildCommandArgs": "-m -v:minimal",
      "ctestCommandArgs": "",
      "inheritEnvironments": []
    },
    {
      "name": "x64-Release",
      "generator": "Visual Studio 17 2022 Win64",
      "configurationType": "Release",
      "buildRoot": "${projectDir}\\build64",
      "cmakeCommandArgs": "",
      "buildCommandArgs": "-m -v:minimal",
      "ctestCommandArgs": "",
      "inheritEnvironments": []
    },
    {
      "name": "x64-ReleaseWithDebInfo",
      "generator": "Visual Studio 17 2022 Win64",
      "configurationType": "RelWithDebInfo",
      "buildRoot": "${projectDir}\\build64",
      "cmakeCommandArgs": "",
      "buildCommandArgs": "-m -v:minimal",
      "ctestCommandArgs": "",
      "inheritEnvironments": []
    }
  ]
}

[acidicoala]

I think the faulty compiler configuration is specified in the CI config:

asmtk/.github/workflows/build.yml

Line 17 in 53b251c

- { title: "windows-lib" , os: "windows-latest", cc: "vs2019" , arch: "x86", build_type: "Debug" , defs: "ASMJIT_DIR=../asmjit", problem_matcher: "cpp" }

[kobalicek]

Thanks! I will fix the CI later.