Try to setup the CI

.github/workflows/ci.yml

@@ -0,0 +1,56 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  build-linux-gcc:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v1
+      - name: install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -qq libsdl2-dev
+      - name: build te
+        run: |
+          make
+        env:
+          CC: gcc
+  build-linux-clang:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v1
+      - name: install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -qq libsdl2-dev
+      - name: build te
+        run: |
+          make
+        env:
+          CC: clang
+  build-macos:
+    runs-on: macOS-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: install dependencies
+        run: brew install sdl2 pkg-config
+      - name: build te
+        run: |
+          make
+        env:
+          CC: clang
+  build-windows-msvc:
+    runs-on: windows-2019
+    steps:
+      - uses: actions/checkout@v1
+        # this runs vcvarsall for us, so we get the MSVC toolchain in PATH.
+      - uses: seanmiddleditch/gha-setup-vsdevenv@master
+      - name: download sdl2
+        run: |
+          curl -fsSL -o SDL2-devel-2.0.14-VC.zip https://www.libsdl.org/release/SDL2-devel-2.0.14-VC.zip
+          tar -xf SDL2-devel-2.0.14-VC.zip
+          mv SDL2-2.0.14 SDL2
+      - name: build te
+        shell: cmd
+        run: |
+          ./build_msvc.bat

.gitignore

@@ -1 +1,6 @@
-te
+te
+SDL2
+*.exe
+*.obj
+*.pdb
+*.ilk

build_msvc.bat

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+@echo off
+rem launch this from msvc-enabled console
+
+set CFLAGS=/W4 /WX /std:c11 /FC /TC /Zi /nologo
+set INCLUDES=/I SDL2\include
+set LIBS=SDL2\lib\x64\SDL2.lib SDL2\lib\x64\SDL2main.lib Shell32.lib
+
+cl.exe %CFLAGS% %INCLUDES% /Fete main.c la.c /link %LIBS% -SUBSYSTEM:windows