linux headless build, default the gui debugger to off

appveyor.yml

@@ -8,11 +8,14 @@ configuration:
 - mingw64-gdi
 - msys-gdi
 - linux-sdl
+- linux-headless
 
 matrix:
   exclude:
     - configuration: linux-sdl
       image: Visual Studio 2017
+    - configuration: linux-headless
+      image: Visual Studio 2017
     - configuration: mingw32-sdl
       image: Ubuntu1804
     - configuration: mingw32-gdi
@@ -119,3 +122,20 @@ for:
     artifacts:
       - path: 'build/bin/GSplus'
         name: GSplus-linux-sdl
+
+  - # linux/headless
+    matrix:
+      only:
+        - image: Ubuntu1804
+          configuration: linux-headless
+    install:
+      - sh: sudo apt-get update
+      - sh: sudo apt-get install -y re2c
+    build_script:
+      - sh: mkdir build
+      - sh: cd build
+      - sh: cmake ../ -DDRIVER=HEADLESS
+      - sh: make VERBOSE=1 GSplus
+    artifacts:
+      - path: 'build/bin/GSplus'
+        name: GSplus-linux-headless

src/CMakeLists.txt

@@ -57,7 +57,7 @@ pkg_check_modules(FREETYPE2 freetype2)
 # run ccmake, cmake -LH, or cmake -D...
 #
 set(DRIVER "SDL" CACHE STRING "Driver (SDL, X11, WIN32, FB, or HEADLESS")
-option(WITH_DEBUGGER "Enable the debugger" ON)
+option(WITH_DEBUGGER "Enable the debugger" OFF)
 option(WITH_HOST_FST "Enable host fst support" ON)
 option(TOGGLE_STATUS "Enable F10 Toggle Status support (win32/x11)" OFF)
 option(WITH_RAWNET "Enable Uthernet emulation" OFF)