Do not truncate compiler versions generated by PC/pyconfig.h

Author: vstinner

Lib/test/test_tools/test_getbuildinfo.py

@@ -141,8 +141,10 @@ def check_unchanged(compiler):
         check('Custom Vendor (something) Clang 22.1.0+dev',
               'Custom Vendor Clang 22.1.0+dev')
 
+        check_unchanged('Clang 22.1.3 64 bit (AMD64) with MSC v.1951 CRT')
         check_unchanged('GCC 16.2.1 20260819 (Red Hat 16.2.1-2)')
         check_unchanged('GCC 15.2.0')
+        check_unchanged('MSC v.1951 64 bit (AMD64)')
         check_unchanged('MSC v.1951 32 bit (Intel)')
 
         with support.captured_stdout() as stdout:

Tools/build/generate_getbuildinfo.py

@@ -182,6 +182,17 @@ def _get_compiler():
 
 
 def compact_compiler(compiler):
+    if '64 bit (AMD64)' in compiler:
+        # On Windows, the '64 bit (AMD64)' pattern is expected by multiple
+        # tools such as sysconfig.get_platform() and ctypes.util.find_msvcrt().
+        # Example: 'MSC v.1951 64 bit (AMD64)'.
+        return compiler
+    if ' with MSC v' in compiler:
+        # Do not truncate "Clang with MSC" version:
+        # ''Clang 22.1.3 64 bit (AMD64) with MSC v.1951 CRT'
+        return compiler
+
+    # Truncate long Clang version (ex: strip long URL)
     match = CLANG_VERSION_REGEX.search(compiler)
     if match:
         vendor = match.group(1)