.github/workflow: add a test to build with the build tag ebitencbackend

.github/workflows/test.yml

@@ -79,6 +79,11 @@ jobs:
           env GOOS=windows GOARCH=amd64 go build -tags=example -v ./...
           env GOOS=windows GOARCH=386 go build -tags=example -v ./...
 
+      - name: go build (cbackend)
+        if: ${{ !startsWith(matrix.os, 'windows-')
+        run: |
+          go build -tags=example,ebitencbackend -v ./...
+
       - name: go test (Go 1.16 or older)
         # TODO: Add more test environments (#1305)
         if: ${{ startsWith(matrix.os, 'ubuntu-') && (startsWith(matrix.go, '1.15.') || startsWith(matrix.go, '1.16.')) }}

internal/graphicsdriver/opengl/gl/procaddr_notwindows.go

@@ -24,8 +24,8 @@ package gl
 #cgo linux,!ebitencbackend freebsd,!ebitencbackend openbsd,!ebitencbackend pkg-config: gl
 #cgo egl CFLAGS: -DTAG_EGL
 #cgo egl,!ebitencbackend pkg-config: egl
-#cgo !darwin ebitencbackend LDFLAGS: -Wl,-unresolved-symbols=ignore-all
-#cgo darwin ebitencbackend LDFLAGS: -Wl,-undefined,dynamic_lookup
+#cgo !darwin,ebitencbackend LDFLAGS: -Wl,-unresolved-symbols=ignore-all
+#cgo darwin,ebitencbackend LDFLAGS: -Wl,-undefined,dynamic_lookup
 // Check the EGL tag first as it takes priority over the platform's default
 // configuration of WGL/GLX/CGL.
 #if defined(TAG_EGL)

internal/ui/graphics_opengl.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !darwin || ebitengl
-// +build !darwin ebitengl
+//go:build !darwin || ebitencbackend || ebitengl
+// +build !darwin ebitencbackend ebitengl
 
 package ui