Use GitHub Actions to run current macOS Travis CI tasks

.github/workflows/macos.yml

@@ -0,0 +1,36 @@
+# Copyright (C) 2020 Sebastian Pipping <sebastian@pipping.org>
+# Licensed under the MIT license
+
+name: Run macOS Travis CI tasks
+
+on:
+- pull_request
+- push
+
+jobs:
+  checks:
+    name: Perform checks
+    strategy:
+      matrix:
+        include:
+          # NOTE: This is a quick port from .travis.yml in reaction to
+          #       Homebrew issues at Travis CI.  While we have the matrix
+          #       in two places, please keep the two files in sync.  Thank you!
+          - MODE: cmake-oos
+          - MODE: distcheck
+          - MODE: qa-sh
+            FLAT_ENV: CC=clang CXX=clang++ LD=clang++ QA_SANITIZER=address
+          - MODE: cppcheck
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2.3.4
+    - name: Install build dependencies
+      run: |
+        sudo rm /usr/local/bin/2to3  # so that "brew link" will work
+        brew bundle                  # acts upon file Brewfile
+    - name: Perform check "${{ matrix.MODE }}"
+      env:
+        MODE: ${{ matrix.MODE }}
+        TRAVIS_OS_NAME: osx
+      run: |
+        env ${{ matrix.FLAT_ENV }} ./.travis.sh

.travis.yml

@@ -4,7 +4,6 @@
 language: cpp
 os:
   - linux
-  - osx
 dist: trusty
 
 git:
@@ -14,14 +13,15 @@ env:
   global:
     - CFLAGS='-g3 -pipe'
   matrix:
+    # NOTE: There is a copy of this matrix at .github/workflows/macos.yml
+    #       for GitHub Actions.  While we have the matrix in two places,
+    #       please keep the two files in sync.  Thank you!
     - MODE=cmake-oos
     - MODE=distcheck
     - MODE=qa-sh CC=clang CXX=clang++ LD=clang++ QA_SANITIZER=address
 
 matrix:
   include:
-    - os: osx
-      env: MODE=cppcheck
     - os: linux
       env: MODE=clang-format
     - os: linux