[tsgen] Ignore source map when generating TS definitions.

Fixes #22768

Author: brendandahl

test/test_other.py

@@ -3372,6 +3372,11 @@ def test_embind_tsgen_ignore(self):
     self.emcc(test_file('other/embind_tsgen.cpp'), extra_args)
     self.assertFileContents(test_file('other/embind_tsgen_ignore_3.d.ts'), read_file('embind_tsgen.d.ts'))
 
+    extra_args = ['-fsanitize=undefined',
+                  '-gsource-map']
+    self.emcc(test_file('other/embind_tsgen.cpp'), extra_args)
+    self.assertFileContents(test_file('other/embind_tsgen_ignore_3.d.ts'), read_file('embind_tsgen.d.ts'))
+
   def test_embind_tsgen_worker_env(self):
     self.emcc_args += ['-lembind', '--emit-tsd', 'embind_tsgen.d.ts']
     # Passing -sWASM_WORKERS or -sPROXY_TO_WORKER requires the 'worker' environment

tools/link.py

@@ -1985,6 +1985,8 @@ def run_embind_gen(wasm_target, js_syms, extra_settings, linker_inputs):
   settings.JS_LIBRARIES[embind_index] = 'embind/embind_gen.js'
   if settings.MEMORY64:
     settings.MIN_NODE_VERSION = 160000
+  # Source maps haven't been generated yet and aren't needed to run embind_gen.
+  settings.LOAD_SOURCE_MAP = 0
   outfile_js = in_temp('tsgen.js')
   # The Wasm outfile may be modified by emscripten.emscript, so use a temporary file.
   outfile_wasm = in_temp('tsgen.wasm')