display verbose message when build failed.

Author: xuhancn

python/triton/runtime/build.py

@@ -3,10 +3,12 @@
 import functools
 import hashlib
 import importlib.util
+import locale
 import logging
 import os
 import shutil
 import subprocess
+import sys
 import sysconfig
 import tempfile
 import re
@@ -16,6 +18,8 @@
 from .cache import get_cache_manager
 from .. import knobs
 
+_IS_WINDOWS = sys.platform == "win32"
+SUBPROCESS_DECODE_ARGS = (locale.getpreferredencoding(),) if _IS_WINDOWS else ()
 
 def is_xpu():
     import torch
@@ -106,7 +110,13 @@ def _build(name: str, src: str, srcdir: str, library_dirs: list[str], include_di
     if os.getenv("VERBOSE"):
         print(" ".join(cc_cmd))
 
-    subprocess.check_call(cc_cmd, stdout=subprocess.DEVNULL)
+    try:
+        subprocess.run(
+            cc_cmd, check=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT
+        )
+    except Exception as e:
+        output = e.stdout.decode(*SUBPROCESS_DECODE_ARGS)
+        raise RuntimeError(output)
     return so