[emcc.py] Consolidate early-exit flag handling. NFC (#23437)

emcc.py

@@ -574,6 +574,8 @@ def run(args):
   if not shared.SKIP_SUBPROCS:
     shared.check_sanity()
 
+  # Begin early-exit flag handling.
+
   if '--version' in args:
     print(version_string())
     print('''\
@@ -608,45 +610,26 @@ def run(args):
       print(shared.shlex_join(parts[1:]))
     return 0
 
-  if 'EMMAKEN_NO_SDK' in os.environ:
-    exit_with_error('EMMAKEN_NO_SDK is no longer supported.  The standard -nostdlib and -nostdinc flags should be used instead')
-
-  if 'EMMAKEN_COMPILER' in os.environ:
-    exit_with_error('`EMMAKEN_COMPILER` is no longer supported.\n' +
-                    'Please use the `LLVM_ROOT` and/or `COMPILER_WRAPPER` config settings instead')
-
-  if 'EMMAKEN_CFLAGS' in os.environ:
-    exit_with_error('`EMMAKEN_CFLAGS` is no longer supported, please use `EMCC_CFLAGS` instead')
-
-  if 'EMCC_REPRODUCE' in os.environ:
-    options.reproduce = os.environ['EMCC_REPRODUCE']
-
-  # For internal consistency, ensure we don't attempt or read or write any link time
-  # settings until we reach the linking phase.
-  settings.limit_settings(COMPILE_TIME_SETTINGS)
-
-  newargs, input_files = phase_setup(options, state, newargs)
-
-  if '-dumpmachine' in newargs or '-print-target-triple' in newargs or '--print-target-triple' in newargs:
+  if '-dumpmachine' in args or '-print-target-triple' in args or '--print-target-triple' in args:
     print(shared.get_llvm_target())
     return 0
 
-  if '-print-search-dirs' in newargs or '--print-search-dirs' in newargs:
+  if '-print-search-dirs' in args or '--print-search-dirs' in args:
     print(f'programs: ={config.LLVM_ROOT}')
     print(f'libraries: ={cache.get_lib_dir(absolute=True)}')
     return 0
 
-  if '-print-resource-dir' in newargs:
-    shared.check_call([clang] + newargs)
+  if '-print-resource-dir' in args:
+    shared.check_call([clang] + args)
     return 0
 
-  if '-print-libgcc-file-name' in newargs or '--print-libgcc-file-name' in newargs:
+  if '-print-libgcc-file-name' in args or '--print-libgcc-file-name' in args:
     settings.limit_settings(None)
     compiler_rt = system_libs.Library.get_usable_variations()['libcompiler_rt']
     print(compiler_rt.get_path(absolute=True))
     return 0
 
-  print_file_name = [a for a in newargs if a.startswith(('-print-file-name=', '--print-file-name='))]
+  print_file_name = [a for a in args if a.startswith(('-print-file-name=', '--print-file-name='))]
   if print_file_name:
     libname = print_file_name[-1].split('=')[1]
     system_libpath = cache.get_lib_dir(absolute=True)
@@ -657,6 +640,27 @@ def run(args):
       print(libname)
     return 0
 
+  # End early-exit flag handling
+
+  if 'EMMAKEN_NO_SDK' in os.environ:
+    exit_with_error('EMMAKEN_NO_SDK is no longer supported.  The standard -nostdlib and -nostdinc flags should be used instead')
+
+  if 'EMMAKEN_COMPILER' in os.environ:
+    exit_with_error('`EMMAKEN_COMPILER` is no longer supported.\n' +
+                    'Please use the `LLVM_ROOT` and/or `COMPILER_WRAPPER` config settings instead')
+
+  if 'EMMAKEN_CFLAGS' in os.environ:
+    exit_with_error('`EMMAKEN_CFLAGS` is no longer supported, please use `EMCC_CFLAGS` instead')
+
+  if 'EMCC_REPRODUCE' in os.environ:
+    options.reproduce = os.environ['EMCC_REPRODUCE']
+
+  # For internal consistency, ensure we don't attempt or read or write any link time
+  # settings until we reach the linking phase.
+  settings.limit_settings(COMPILE_TIME_SETTINGS)
+
+  newargs, input_files = phase_setup(options, state, newargs)
+
   if options.reproduce:
     create_reproduce_file(options.reproduce, args)