Add wasm exception handling support to sdl2_image port (emscripten-core#23554)

`sdl2_image` uses setjmp/longjmp so it needs to be aware of wasm
exception handling.

Author: hoodmane

test/common.py

@@ -1064,6 +1064,9 @@ def require_wasm_eh(self):
         self.node_args.append('--experimental-wasm-exnref')
         return
 
+    if self.is_browser_test():
+      return
+
     if config.V8_ENGINE and config.V8_ENGINE in self.js_engines:
       self.emcc_args.append('-sENVIRONMENT=shell')
       self.js_engines = [config.V8_ENGINE]

test/test_browser.py

@@ -24,7 +24,7 @@
 from common import BrowserCore, RunnerCore, path_from_root, has_browser, EMTEST_BROWSER, Reporting
 from common import create_file, parameterized, ensure_dir, disabled, test_file, WEBIDL_BINDER
 from common import read_file, EMRUN, no_wasm64, no_2gb, no_4gb
-from common import requires_wasm2js, parameterize, find_browser_test_file
+from common import requires_wasm2js, parameterize, find_browser_test_file, with_all_sjlj
 from common import also_with_minimal_runtime, also_with_wasm2js, also_with_asan
 from tools import shared
 from tools import ports
@@ -2956,6 +2956,7 @@ def test_sdl2_image_jpeg(self):
 
   @also_with_wasmfs
   @requires_graphics_hardware
+  @with_all_sjlj
   def test_sdl2_image_formats(self):
     shutil.copy(test_file('screenshot.png'), '.')
     shutil.copy(test_file('screenshot.jpg'), '.')

tools/ports/sdl2_image.py

@@ -46,6 +46,8 @@ def get_lib_name(settings):
     libname += '-' + formats
   if settings.PTHREADS:
     libname += '-mt'
+  if settings.SUPPORT_LONGJMP == 'wasm':
+    libname += '-wasm-sjlj'
   return libname + '.a'
 
 
@@ -77,6 +79,9 @@ def create(final):
     if settings.PTHREADS:
       flags += ['-pthread']
 
+    if settings.SUPPORT_LONGJMP == 'wasm':
+      flags.append('-sSUPPORT_LONGJMP=wasm')
+
     ports.build_port(src_dir, final, 'sdl2_image', flags=flags, srcs=srcs)
 
   return [shared.cache.get_lib(libname, create, what='port')]