Use python deadcode module to help find dead code. NFC (#25349)

I'm removed a few obvious dead declarations, hopefully more to follow.

Author: sbc100

emcc.py

@@ -165,13 +165,6 @@ def make_relative(filename):
       reproduce_file.add(rsp_name, os.path.join(root, 'response.txt'))
 
 
-def cxx_to_c_compiler(cxx):
-  # Convert C++ compiler name into C compiler name
-  dirname, basename = os.path.split(cxx)
-  basename = basename.replace('clang++', 'clang').replace('g++', 'gcc').replace('em++', 'emcc')
-  return os.path.join(dirname, basename)
-
-
 def get_library_basename(filename):
   """Similar to get_file_suffix this strips off all numeric suffixes and then
   then final non-numeric one.  For example for 'libz.so.1.2.8' returns 'libz'"""

pyproject.toml

@@ -108,3 +108,6 @@ ignore_errors = true
 [[tool.mypy.overrides]]
 module = ["psutil", "win32con", "win32gui", "win32process"]
 ignore_missing_imports = true
+
+[tool.deadcode]
+exclude = ["out", "third_party", "test/third_party"]

requirements-dev.txt

@@ -10,6 +10,7 @@ psutil==7.0.0
 ruff==0.11.7
 types-requests==2.32.0.20241016
 unittest-xml-reporting==3.2.0
+deadcode==2.3.1
 
 # This version is mentioned in `site/source/docs/site/about.rst`.
 # Please keep them in sync.

tools/shared.py

@@ -745,9 +745,7 @@ def init():
 EMXX = bat_suffix(path_from_root('em++'))
 EMAR = bat_suffix(path_from_root('emar'))
 EMRANLIB = bat_suffix(path_from_root('emranlib'))
-EM_NM = bat_suffix(path_from_root('emnm'))
 FILE_PACKAGER = bat_suffix(path_from_root('tools/file_packager'))
-WASM_SOURCEMAP = bat_suffix(path_from_root('tools/wasm-sourcemap'))
 # Windows .dll suffix is not included in this list, since those are never
 # linked to directly on the command line.
 DYLIB_EXTENSIONS = ['.dylib', '.so']