SCons: Address minor show_progress issues

methods.py

@@ -857,10 +857,8 @@ def using_emcc(env):
 
 
 def show_progress(env):
-    # Progress reporting is not available in non-TTY environments since it messes with the output
-    # (for example, when writing to a file). Ninja has its own progress/tracking tool that clashes
-    # with ours.
-    if not env["progress"] or not IS_TTY or env["ninja"]:
+    # Ninja has its own progress/tracking tool that clashes with ours.
+    if env["ninja"]:
         return
 
     NODE_COUNT_FILENAME = f"{base_folder_path}.scons_node_count"
@@ -877,30 +875,33 @@ def __init__(self):
             if self.max == 0:
                 print("NOTE: Performing initial build, progress percentage unavailable!")
 
+            # Progress reporting is not available in non-TTY environments since it
+            # messes with the output (for example, when writing to a file).
+            self.display = cast(bool, self.max and env["progress"] and IS_TTY)
+
         def __call__(self, node, *args, **kw):
             self.count += 1
-            if self.max != 0:
+            if self.display:
                 percent = int(min(self.count * 100 / self.max, 100))
                 sys.stdout.write(f"\r[{percent:3d}%] ")
                 sys.stdout.flush()
 
     from SCons.Script import Progress
+    from SCons.Script.Main import GetBuildFailures
 
     progressor = ShowProgress()
     Progress(progressor)
 
-    def progress_finish(target, source, env):
+    def progress_finish():
+        if len(GetBuildFailures()):
+            return
         try:
             with open(NODE_COUNT_FILENAME, "w", encoding="utf-8", newline="\n") as f:
                 f.write(f"{progressor.count}\n")
         except OSError:
             pass
 
-    env.AlwaysBuild(
-        env.CommandNoCache(
-            "progress_finish", [], env.Action(progress_finish, "Building node count database .scons_node_count")
-        )
-    )
+    atexit.register(progress_finish)
 
 
 def convert_size(size_bytes: int) -> str: