Migrate from Travis CI to GitHub Actions

The old Travis CI .org service has been throttled for a while now and is
said to be shutting down completely next week.

This migrates the Travis CI build jobs to GitHub Actions, with minor
changes.

- The trailing whitespace detection has been removed for now.
- The libegl1-mesa-dev dependency for Wayland has been removed as it
  appears to no longer be necessary for building.

(cherry picked from commit 5a6001a83b)

.github/workflows/build.yml

@@ -0,0 +1,91 @@
+name: Build
+on:
+    pull_request:
+    push:
+        branches: [ ci, master, 3.3-stable ]
+permissions:
+    statuses: write
+    contents: read
+env:
+    CC: clang
+    CFLAGS: -Werror
+
+jobs:
+    build-linux-x11-clang:
+        name: X11 (Linux, Clang)
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - name: Install dependencies
+              run: |
+                  sudo apt update
+                  sudo apt install libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libxext-dev
+
+            - name: Configure static library
+              run: cmake -S . -B build-static
+            - name: Build static library
+              run: cmake --build build-static --parallel
+
+            - name: Configure shared library
+              run: cmake -S . -B build-shared -D BUILD_SHARED_LIBS=ON
+            - name: Build shared library
+              run: cmake --build build-shared --parallel
+
+    build-linux-wayland-clang:
+        name: Wayland (Linux, Clang)
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - name: Install dependencies
+              run: |
+                  sudo apt update
+                  sudo apt install wayland-protocols libwayland-dev libxkbcommon-dev
+
+            - name: Configure static library
+              run: cmake -S . -B build-static -D GLFW_USE_WAYLAND=ON
+            - name: Build static library
+              run: cmake --build build-static --parallel
+
+            - name: Configure shared library
+              run: cmake -S . -B build-shared -D GLFW_USE_WAYLAND=ON -D BUILD_SHARED_LIBS=ON
+            - name: Build shared library
+              run: cmake --build build-shared --parallel
+
+    build-linux-null-clang:
+        name: Null (Linux, Clang)
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - name: Install dependencies
+              run: |
+                  sudo apt update
+                  sudo apt install libosmesa6-dev
+
+            - name: Configure static library
+              run: cmake -S . -B build-static -D GLFW_USE_OSMESA=ON
+            - name: Build static library
+              run: cmake --build build-static --parallel
+
+            - name: Configure shared library
+              run: cmake -S . -B build-shared -D GLFW_USE_OSMESA=ON -D BUILD_SHARED_LIBS=ON
+            - name: Build shared library
+              run: cmake --build build-shared --parallel
+
+    build-macos-cocoa-clang:
+        name: Cocoa (macOS, Clang)
+        runs-on: macos-latest
+        env:
+            MACOSX_DEPLOYMENT_TARGET: 10.8
+        steps:
+            - uses: actions/checkout@v2
+
+            - name: Configure static library
+              run: cmake -S . -B build-static
+            - name: Build static library
+              run: cmake --build build-static --parallel
+
+            - name: Configure shared library
+              run: cmake -S . -B build-shared -D BUILD_SHARED_LIBS=ON
+            - name: Build shared library
+              run: cmake --build build-shared --parallel
+

.travis.yml

@@ -1,114 +0,0 @@
-language: c
-compiler: clang
-branches:
-    only:
-        - ci
-        - master
-        - 3.3-stable
-matrix:
-    include:
-        - os: linux
-          dist: xenial
-          name: "X11 shared library"
-          addons:
-              apt:
-                  packages:
-                      - libxrandr-dev
-                      - libxinerama-dev
-                      - libxcursor-dev
-                      - libxi-dev
-          env:
-              - BUILD_SHARED_LIBS=ON
-              - CFLAGS=-Werror
-        - os: linux
-          dist: xenial
-          name: "X11 static library"
-          addons:
-              apt:
-                  packages:
-                      - libxrandr-dev
-                      - libxinerama-dev
-                      - libxcursor-dev
-                      - libxi-dev
-          env:
-              - BUILD_SHARED_LIBS=OFF
-              - CFLAGS=-Werror
-        - os: linux
-          dist: focal
-          name: "Wayland shared library"
-          addons:
-              apt:
-                  packages:
-                      - extra-cmake-modules
-                      - wayland-protocols
-                      - libwayland-dev
-                      - libxkbcommon-dev
-                      - libegl1-mesa-dev
-          env:
-              - USE_WAYLAND=ON
-              - BUILD_SHARED_LIBS=ON
-              - CFLAGS=-Werror
-        - os: linux
-          dist: focal
-          name: "Wayland static library"
-          addons:
-              apt:
-                  packages:
-                      - extra-cmake-modules
-                      - wayland-protocols
-                      - libwayland-dev
-                      - libxkbcommon-dev
-                      - libegl1-mesa-dev
-          env:
-              - USE_WAYLAND=ON
-              - BUILD_SHARED_LIBS=OFF
-              - CFLAGS=-Werror
-        - os: linux
-          dist: bionic
-          name: "Null shared library"
-          addons:
-              apt:
-                  packages:
-                      - libosmesa6-dev
-          env:
-              - BUILD_SHARED_LIBS=ON
-              - USE_OSMESA=ON
-              - CFLAGS=-Werror
-        - os: linux
-          dist: bionic
-          name: "Null static library"
-          addons:
-              apt:
-                  packages:
-                      - libosmesa6-dev
-          env:
-              - BUILD_SHARED_LIBS=OFF
-              - USE_OSMESA=ON
-              - CFLAGS=-Werror
-        - os: osx
-          name: "Cocoa shared library"
-          env:
-              - BUILD_SHARED_LIBS=ON
-              - CFLAGS=-Werror
-              - MACOSX_DEPLOYMENT_TARGET=10.8
-        - os: osx
-          name: "Cocoa static library"
-          env:
-              - BUILD_SHARED_LIBS=OFF
-              - CFLAGS=-Werror
-              - MACOSX_DEPLOYMENT_TARGET=10.8
-script:
-    - if grep -Inr '\s$' src include docs tests examples CMake *.md .gitattributes .gitignore; then
-          echo Trailing whitespace found, aborting;
-          exit 1;
-      fi
-    - mkdir build
-    - cd build
-    - cmake -DCMAKE_VERBOSE_MAKEFILE=ON -DBUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -DGLFW_USE_WAYLAND=${USE_WAYLAND} -DGLFW_USE_OSMESA=${USE_OSMESA} ..
-    - cmake --build .
-notifications:
-    email:
-        recipients:
-            - ci@glfw.org
-    on_success: never
-    on_failure: always

README.md

@@ -1,6 +1,6 @@
 # GLFW
 
-[![Build status](https://travis-ci.org/glfw/glfw.svg?branch=master)](https://travis-ci.org/glfw/glfw)
+[![Build status](https://github.com/glfw/glfw/actions/workflows/build.yml/badge.svg)](https://github.com/glfw/glfw/actions)
 [![Build status](https://ci.appveyor.com/api/projects/status/0kf0ct9831i5l6sp/branch/master?svg=true)](https://ci.appveyor.com/project/elmindreda/glfw)
 [![Coverity Scan](https://scan.coverity.com/projects/4884/badge.svg)](https://scan.coverity.com/projects/glfw-glfw)