Add README, FUNDING, and CI files

.cirrus.yml

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+common_tasks_template: &COMMON_TASKS_TEMPLATE
+  # Location of downloaded prerequesites
+  gcc_deps_cache:
+    folder: gcc-deps
+    fingerprint_script: cat gcc/BASE-VER
+  # Typical build time is ~25 minutes, factor in twice that for waiting time
+  timeout_in: 120m
+  # Scripts to configure, build, and test
+  setup_script: ./buildci.sh setup
+  build_script: ./buildci.sh build
+  test_script: |
+    if [ "${RUN_TESTSUITE:-0}" = "1" ]
+    then
+      ./buildci.sh testsuite
+    else
+      ./buildci.sh unittests
+    fi
+  # Location of compressed testsuite logs
+  testsuite_artifacts:
+    path: logs/**
+
+environment:
+  CIRRUS_CLONE_DEPTH: 50
+
+# Linux
+task:
+  name: Ubuntu $TASK_NAME_SUFFIX
+  container:
+    image: ubuntu:20.04
+    cpu: 8
+    memory: 16G
+  environment:
+    matrix:
+      - TASK_NAME_SUFFIX: Testsuite
+        RUN_TESTSUITE: 1
+      - TASK_NAME_SUFFIX: Unit Tests
+        RUN_TESTSUITE: 0
+  << : *COMMON_TASKS_TEMPLATE
+
+# FreeBSD
+task:
+  name: FreeBSD $TASK_NAME_SUFFIX
+  freebsd_instance:
+    image_family: freebsd-12-2
+    cpu: 8
+    memory: 16G
+  environment:
+    matrix:
+      - TASK_NAME_SUFFIX: Testsuite
+        RUN_TESTSUITE: 1
+      - TASK_NAME_SUFFIX: Unit Tests
+        RUN_TESTSUITE: 0
+  install_bash_script: |
+    pkg install -y bash
+    ln -s /usr/local/bin/bash /bin/bash
+  << : *COMMON_TASKS_TEMPLATE
+
+# Mac
+task:
+  name: Darwin $TASK_NAME_SUFFIX
+  osx_instance:
+    image: catalina-xcode
+  environment:
+    matrix:
+      - TASK_NAME_SUFFIX: Testsuite
+        RUN_TESTSUITE: 1
+      - TASK_NAME_SUFFIX: Unit Tests
+        RUN_TESTSUITE: 0
+  << : *COMMON_TASKS_TEMPLATE

.github/FUNDING.yml

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+github: [ ibuclaw ]

.github/workflows/main.yml

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+# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
+
+name: Main
+on:
+  - push # branch or tag
+
+jobs:
+  linux:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - job_name: ubuntu-x86_64 (testsuite)
+            target: x86_64-linux-gnu
+          - job_name: ubuntu-x86_64 (unittests)
+            target: x86_64-linux-gnu
+          - job_name: ubuntu-x86_64 (bootstrap)
+            target: x86_64-linux-gnu
+            bootstrap: enable
+          - job_name: ubuntu-arm
+            target: arm-linux-gnueabi
+          - job_name: ubuntu-armhf
+            target: arm-linux-gnueabihf
+          - job_name: ubuntu-aarch64
+            target: aarch64-linux-gnu
+          - job_name: ubuntu-mips
+            target: mips-linux-gnu
+          - job_name: ubuntu-mips64el
+            target: mips64el-linux-gnuabi64
+          - job_name: ubuntu-mipsel
+            target: mipsel-linux-gnu
+          - job_name: ubuntu-powerpc64le
+            target: powerpc64le-linux-gnu
+          - job_name: ubuntu-systemz
+            target: s390x-linux-gnu
+          - job_name: ubuntu-sparc64
+            target: sparc64-linux-gnu
+    name: ${{ matrix.job_name }}
+    runs-on: ubuntu-22.04
+    env:
+      GCC_CI_TARGET: ${{ matrix.target }}
+      GCC_CI_BOOTSTRAP: ${{ matrix.bootstrap || 'disable' }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 10
+      - name: Install dependencies
+        run: ./buildci.sh installdeps
+      - name: Configure gdc
+        run: ./buildci.sh configure
+      - name: Build gdc
+        run: ./buildci.sh build
+      - name: Run testsuite
+        run: ${{ contains(matrix.job_name, 'testsuite') && './buildci.sh testsuite' || 'echo disabled' }}
+      - name: Run unittests
+        run: ${{ contains(matrix.job_name, 'unittests') && './buildci.sh unittests' || 'echo disabled' }}

.semaphore/semaphore.yml

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+version: v1.0
+name: GDC
+agent:
+  machine:
+    type: e1-standard-2
+    os_image: ubuntu1804
+execution_time_limit:
+  hours: 3
+
+blocks:
+  - name: "Ubuntu 18.04"
+    dependencies: []
+    execution_time_limit:
+      hours: 2
+    task:
+      jobs:
+      - name: "Testsuite"
+        commands:
+          - checkout
+          - ./buildci.sh setup
+          - ./buildci.sh build
+          - ./buildci.sh testsuite
+      - name: "Unit Tests"
+        commands:
+          - checkout
+          - ./buildci.sh setup
+          - ./buildci.sh build
+          - ./buildci.sh unittests
+  - name: "OSX 10.15"
+    dependencies: []
+    task:
+      agent:
+        machine:
+          type: a1-standard-4
+          os_image: macos-xcode11
+      jobs:
+      - name: "Testsuite"
+        commands:
+          - checkout
+          - ./buildci.sh setup
+          - ./buildci.sh build
+          - ./buildci.sh testsuite
+      - name: "Unit Tests"
+        commands:
+          - checkout
+          - ./buildci.sh setup
+          - ./buildci.sh build
+          - ./buildci.sh unittests