More use of os.execv. NFC

Followup to emscripten-core#20884

emar.py

@@ -10,5 +10,4 @@
 import sys
 from tools import shared
 
-cmd = [shared.LLVM_AR] + sys.argv[1:]
-sys.exit(shared.run_process(cmd, stdin=sys.stdin, check=False).returncode)
+shared.exec_process([shared.LLVM_AR] + sys.argv[1:])

emcc.py

@@ -934,15 +934,6 @@ def get_clang_output_extension(state):
     return '.o'
 
 
-def exec_subprocess_and_exit(cmd):
-  if utils.WINDOWS:
-    shared.check_call(cmd)
-    sys.exit(0)
-  else:
-    shared.print_compiler_stage(cmd)
-    os.execv(cmd[0], cmd)
-
-
 @ToolchainProfiler.profile_block('compile inputs')
 def phase_compile_inputs(options, state, newargs, input_files):
   if shared.run_via_emxx:
@@ -991,7 +982,7 @@ def get_clang_command_asm():
     # output the dependency rule. Warning: clang and gcc behave differently
     # with -MF! (clang seems to not recognize it)
     logger.debug(('just preprocessor ' if state.has_dash_E else 'just dependencies: ') + ' '.join(cmd))
-    exec_subprocess_and_exit(cmd)
+    shared.exec_process(cmd)
 
   # Precompiled headers support
   if state.mode == Mode.PCH:
@@ -1003,7 +994,7 @@ def get_clang_command_asm():
     if options.output_file:
       cmd += ['-o', options.output_file]
     logger.debug(f"running (for precompiled headers): {cmd[0]} {' '.join(cmd[1:])}")
-    exec_subprocess_and_exit(cmd)
+    shared.exec_process(cmd)
 
   if state.mode == Mode.COMPILE_ONLY:
     inputs = [i[1] for i in input_files]
@@ -1018,7 +1009,7 @@ def get_clang_command_asm():
     ext = get_clang_output_extension(state)
     if not options.output_file and options.default_object_extension != ext:
       # If we are using a non-standard output file extention we cannot use
-      # exec_subprocess_and_exit here since we need to rename the files
+      # exec_process here since we need to rename the files
       # after clang runs (since clang does not support --default-obj-ext)
       # TODO: Remove '--default-obj-ext' to reduce this complexity
       shared.check_call(cmd)
@@ -1028,7 +1019,7 @@ def get_clang_command_asm():
         shutil.move(output, new_output)
       sys.exit(0)
     else:
-      exec_subprocess_and_exit(cmd)
+      shared.exec_process(cmd)
 
   # In COMPILE_AND_LINK we need to compile source files too, but we also need to
   # filter out the link flags

emranlib.py

@@ -13,11 +13,4 @@
 import sys
 from tools import shared
 
-
-def run():
-  newargs = [shared.LLVM_RANLIB] + sys.argv[1:]
-  return shared.run_process(newargs, stdin=sys.stdin, check=False).returncode
-
-
-if __name__ == '__main__':
-  sys.exit(run())
+shared.exec_process([shared.LLVM_RANLIB] + sys.argv[1:])

emstrip.py

@@ -10,5 +10,4 @@
 import sys
 from tools import shared
 
-cmd = [shared.LLVM_STRIP] + sys.argv[1:]
-sys.exit(shared.run_process(cmd, stdin=sys.stdin, check=False).returncode)
+shared.exec_process([shared.LLVM_STRIP] + sys.argv[1:])

tools/emdwp.py

@@ -16,5 +16,4 @@
 
 from tools import shared
 
-cmd = [shared.LLVM_DWP] + sys.argv[1:]
-sys.exit(shared.run_process(cmd, stdin=sys.stdin, check=False).returncode)
+shared.exec_process([shared.LLVM_DWP] + sys.argv[1:])

tools/emnm.py

@@ -16,5 +16,4 @@
 
 from tools import shared
 
-cmd = [shared.LLVM_NM] + sys.argv[1:]
-sys.exit(shared.run_process(cmd, stdin=sys.stdin, check=False).returncode)
+shared.exec_process([shared.LLVM_NM] + sys.argv[1:])

tools/shared.py

@@ -240,6 +240,15 @@ def check_call(cmd, *args, **kw):
     exit_with_error("'%s' failed: %s", shlex_join(cmd), str(e))
 
 
+def exec_process(cmd):
+  if utils.WINDOWS:
+    rtn = shared.run_process(cmd, stdin=sys.stdin, check=False).returncode
+    sys.exit(rtn)
+  else:
+    print_compiler_stage(cmd)
+    os.execv(cmd[0], cmd)
+
+
 def run_js_tool(filename, jsargs=[], node_args=[], **kw):  # noqa: mutable default args
   """Execute a javascript tool.