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diff --git a/project/toolset.py b/project/toolset.py
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+++ b/project/toolset.py
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+# Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "cmake-common" project.
+# For details, see https://github.com/egor-tensin/cmake-common.
+# Distributed under the MIT License.
+
+'''Supported platform/build system/compiler combinations include, but are not
+limited to:
+
+| Platform | Build system | Compiler
+| -------- | ------------ | --------
+| Linux    | make         | Clang
+|          |              | GCC
+|          |              | MinGW-w64
+| Windows  | make [1]     | Clang (clang/clang++)
+|          |              | Clang (clang-cl [2])
+|          |              | MinGW-w64
+|          | msbuild      | MSVC
+| Cygwin   | make         | Clang
+|          |              | GCC
+|          |              | MinGW-w64
+
+1. Both GNU make and MinGW mingw32-make.
+2. Boost 1.69.0 or higher only.
+'''
+
+import argparse
+from enum import Enum
+
+
+class ToolchainType(Enum):
+    AUTO = 'auto'   # This most commonly means GCC on Linux and MSVC on Windows.
+    MSVC = 'msvc'   # Force MSVC.
+    GCC = 'gcc'     # Force GCC.
+    MINGW = 'mingw' # As in MinGW-w64; GCC with the PLATFORM-w64-mingw32 prefix.
+    CLANG = 'clang'
+    CLANG_CL = 'clang-cl'
+
+    def __str__(self):
+        return str(self.value)
+
+    @staticmethod
+    def all():
+        return tuple(ToolchainType)
+
+    @staticmethod
+    def parse(s):
+        try:
+            return ToolchainType(s)
+        except ValueError as e:
+            raise argparse.ArgumentTypeError(f'invalid toolset: {s}') from e