Log the truncated compiler string

Add the script name as prefix to all logged messages.

Author: vstinner

Lib/test/test_tools/test_getbuildinfo.py

@@ -18,6 +18,7 @@
     import generate_getbuildinfo
 
 SRC_DIR = os.path.dirname(test_tools.toolsdir)
+SCRIPT_NAME = 'generate_getbuildinfo.py'
 
 
 class TestGetBuildInfo(unittest.TestCase):
@@ -102,6 +103,7 @@ def test_get_compiler(self):
                             mock_run_command.assert_called_once_with(cmd, check=False)
 
     def test_compact_compiler(self):
+        get_compiler = generate_getbuildinfo.get_compiler
         compact_compiler = generate_getbuildinfo.compact_compiler
 
         def check(compiler, expected):
@@ -143,6 +145,13 @@ def check_unchanged(compiler):
         check_unchanged('GCC 15.2.0')
         check_unchanged('MSC v.1951 32 bit (Intel)')
 
+        with support.captured_stdout() as stdout:
+            compiler = get_compiler('Clang 21.0.0 (clang-2100.1.1.101)')
+            self.assertEqual(compiler, '[Clang 21.0.0]')
+        self.assertEqual(stdout.getvalue(),
+            f"{SCRIPT_NAME}: Truncate compiler string 'Clang 21.0.0 "
+            "(clang-2100.1.1.101)' to 'Clang 21.0.0'\n")
+
     def test_functional(self):
         old_locale = locale.setlocale(locale.LC_ALL)
         self.addCleanup(locale.setlocale, locale.LC_ALL, old_locale)
@@ -165,7 +174,7 @@ def test_functional(self):
                 env['SOURCE_DATE_EPOCH'] = str(1791419852)
                 with support.captured_stdout() as stdout:
                     generate_getbuildinfo.main()
-                self.assertEqual(stdout.getvalue(), f'{filename} updated\n')
+                self.assertEqual(stdout.getvalue(), f'{SCRIPT_NAME}: {filename} updated\n')
 
         with open(filename) as fp:
             output = fp.read()

Tools/build/generate_getbuildinfo.py

@@ -29,9 +29,12 @@
 )
 
 
+def log(msg):
+    print(f"{SCRIPT_NAME}: {msg}")
+
+
 def exit_error(msg):
-    print(msg)
-    print("cwd: {os.getcwd()}")
+    log(msg)
     sys.exit(1)
 
 
@@ -104,7 +107,7 @@ def parse_args():
 
 def run_command(cmd, *, check=True):
     cmd_str = shlex.join(cmd)
-    print(f"+ {cmd_str}")
+    log(f"+ {cmd_str}")
     try:
         proc = subprocess.run(cmd, stdout=subprocess.PIPE, text=True)
     except OSError as exc:
@@ -121,7 +124,7 @@ def run_command(cmd, *, check=True):
         if check:
             exit_error(msg)
         else:
-            print(msg)
+            log(msg)
         return None
 
     return proc.stdout.rstrip()
@@ -177,7 +180,10 @@ def get_compiler(compiler):
         # (see Programs/_getcompiler.c)
         compiler = 'C'
 
-    compiler = compact_compiler(compiler)
+    old_compiler = compiler
+    compiler = compact_compiler(old_compiler)
+    if compiler != old_compiler:
+        log(f"Truncate compiler string {old_compiler!r} to {compiler!r}")
 
     return f'[{compiler}]'
 
@@ -231,7 +237,7 @@ def write_macro(name, value):
         write_macro('VERSION', version)
 
     os.replace(new_filename, output_filename)
-    print(f"{output_filename} updated")
+    log(f"{output_filename} updated")
 
 
 if __name__ == "__main__":