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python/Lib/site-packages/setuptools/_distutils/tests/__init__.py

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+"""
+Test suite for distutils.
+
+Tests for the command classes in the distutils.command package are
+included in distutils.tests as well, instead of using a separate
+distutils.command.tests package, since command identification is done
+by import rather than matching pre-defined names.
+"""
+
+import shutil
+from collections.abc import Sequence
+
+
+def missing_compiler_executable(cmd_names: Sequence[str] = []):  # pragma: no cover
+    """Check if the compiler components used to build the interpreter exist.
+
+    Check for the existence of the compiler executables whose names are listed
+    in 'cmd_names' or all the compiler executables when 'cmd_names' is empty
+    and return the first missing executable or None when none is found
+    missing.
+
+    """
+    from distutils import ccompiler, errors, sysconfig
+
+    compiler = ccompiler.new_compiler()
+    sysconfig.customize_compiler(compiler)
+    if compiler.compiler_type == "msvc":
+        # MSVC has no executables, so check whether initialization succeeds
+        try:
+            compiler.initialize()
+        except errors.DistutilsPlatformError:
+            return "msvc"
+    for name in compiler.executables:
+        if cmd_names and name not in cmd_names:
+            continue
+        cmd = getattr(compiler, name)
+        if cmd_names:
+            assert cmd is not None, f"the '{name}' executable is not configured"
+        elif not cmd:
+            continue
+        if shutil.which(cmd[0]) is None:
+            return cmd[0]