Building GDExtension for linux causes full rebuild oof godot-cpp

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1

Godot Version

4.4.1

Question

I’m trying to set up a workflow action on Github that will automatically compile a GDExtension I’m working on when I invoke it. Since compiling the godot-cpp library takes a long time, I’d like to cache and reuse the libraries. Unfortunately, when I run scons on the my SConstruct in the root of my project, it will automatically trigger the SConstruct file inside of godot-cpp even if the static library has already been built.

I’m compiling the library with scons platform=linux arch=x86_64 custom_api_file=../extension_api.json and my main project with scons platform=linux arch=x86_64.

I don’t have this problem when I build for Windows on my desktop. I’m not sure if this problem is due to how I’m setting up the build server, or if I need to specify extra arguments to scons to stop it from automatically rebuilding the godot-cpp library.

This is my full github action workflow so far:

name: build-linux
on: [workflow_dispatch]
jobs:
  build-linux-extension:
    name: Build Linux Extension
    runs-on: ubuntu-latest
    steps:
        - name: Check out repository code
          uses: actions/checkout@v4
          with:
            submodules: recursive
                        
        - name: Install Packages
          run: |
            sudo apt-get update
            sudo apt-get install -y g++ python3 python3-pip
            sudo python -m pip install scons

        - name: Cache Library
          id: cache-linux-libraries
          uses: actions/cache@v4
          with:
            path: |
              ./map_generation/godot-cpp/bin/*.a
            key: ${{ runner.os }}-extn-${{ hashFiles('./map_generation/godot-cpp/**/*.cpp', './map_generation/godot-cpp/**/*.hpp', './map_generation/godot-cpp/SConstruct') }}
            
        - name: Compile Support Library
          if: steps.cache-linux-libraries.outputs.cache-hit != true
          working-directory: ./map_generation/godot-cpp
          run: |
            scons platform=linux arch=x86_64 custom_api_file=../extension_api.json

        - name: Compile extension
          working-directory: ./map_generation
          run: |
            scons platform=linux arch=x86_64

        - name: List godot-cpp/bin directory
          working-directory: ./map_generation/godot-cpp
          run: |
            ls bin

        - name: List godot/bin directory
          working-directory: ./map_generation/godot
          run: |
            ls bin