Always include library_sdl.js and library_glfw.js conditionally (#19057)

Split out from #19028.

Author: sbc100

emcc.py

@@ -1993,6 +1993,7 @@ def phase_linker_setup(options, state, newargs):
     default_setting('AUTO_JS_LIBRARIES', 0)
     # When using MINIMAL_RUNTIME, symbols should only be exported if requested.
     default_setting('EXPORT_KEEPALIVE', 0)
+    default_setting('USE_GLFW', 0)
 
   if settings.STRICT_JS and (settings.MODULARIZE or settings.EXPORT_ES6):
     exit_with_error("STRICT_JS doesn't work with MODULARIZE or EXPORT_ES6")

src/modules.js

@@ -113,7 +113,6 @@ global.LibraryManager = {
         'library_webgl.js',
         'library_html5_webgl.js',
         'library_openal.js',
-        'library_sdl.js',
         'library_glut.js',
         'library_xlib.js',
         'library_egl.js',
@@ -122,8 +121,8 @@ global.LibraryManager = {
         'library_idbstore.js',
         'library_async.js',
       ]);
-      if (USE_GLFW) {
-        libraries.push('library_glfw.js');
+      if (USE_SDL != 2) {
+        libraries.push('library_sdl.js');
       }
     } else {
       if (ASYNCIFY) {
@@ -137,6 +136,10 @@ global.LibraryManager = {
       }
     }
 
+    if (USE_GLFW) {
+      libraries.push('library_glfw.js');
+    }
+
     if (LZ4) {
       libraries.push('library_lz4.js');
     }

src/settings.js

@@ -1292,6 +1292,7 @@ var EMSCRIPTEN_TRACING = false;
 // Specify the GLFW version that is being linked against.  Only relevant, if you
 // are linking against the GLFW library.  Valid options are 2 for GLFW2 and 3
 // for GLFW3.
+// In MINIMAL_RUNTIME builds, this option defaults to 0.
 // [link]
 var USE_GLFW = 2;
 

src/shell.js

@@ -27,6 +27,7 @@ var /** @type {{
   noAudioDecoding: boolean,
   noWasmDecoding: boolean,
   canvas: HTMLCanvasElement,
+  ctx: Object,
   dataFileDownloads: Object,
   preloadResults: Object,
   useWebGL: boolean,

tools/gen_sig_info.py

@@ -221,6 +221,7 @@ def extract_sig_info(sig_info, extra_settings=None, extra_cflags=None):
     'USE_PTHREADS': 1,
     'STACK_OVERFLOW_CHECK': 1,
     'FULL_ES3': 1,
+    'USE_SDL': 1,
     # Currently GLFW symbols have different sigs for the same symbol because the
     # signatures changed between v2 and v3, so for now we continue to maintain
     # them by hand.