From 03f3e841176d3b1f94fd9434943b16441493dbc1 Mon Sep 17 00:00:00 2001
From: Egor Tensin <egor@tensin.name>
Date: Mon, 29 Dec 2025 22:32:57 +0100
Subject: drop Cygwin, it's obsolete

---
 project/os.py      | 11 ++---------
 project/toolset.py |  5 +----
 project/utils.py   | 11 ++---------
 3 files changed, 5 insertions(+), 22 deletions(-)

(limited to 'project')

diff --git a/project/os.py b/project/os.py
index cb5bd44..db489ce 100644
--- a/project/os.py
+++ b/project/os.py
@@ -10,7 +10,6 @@ import platform
 class OS(Enum):
     WINDOWS = 'Windows'
     LINUX = 'Linux'
-    CYGWIN = 'Cygwin'
     MACOS = 'macOS'
 
     def __str__(self):
@@ -25,8 +24,6 @@ class OS(Enum):
             return OS.LINUX
         if system == 'Darwin':
             return OS.MACOS
-        if system.startswith('CYGWIN_NT'):
-            return OS.CYGWIN
         raise NotImplementedError(f'unsupported OS: {system}')
 
 
@@ -36,7 +33,7 @@ def on_windows():
 
 def on_windows_like():
     os = OS.current()
-    return os is OS.WINDOWS or os is OS.CYGWIN
+    return os is OS.WINDOWS
 
 
 def on_linux():
@@ -45,8 +42,4 @@ def on_linux():
 
 def on_linux_like():
     os = OS.current()
-    return os is OS.LINUX or os is OS.CYGWIN or os is OS.MACOS
-
-
-def on_cygwin():
-    return OS.current() is OS.CYGWIN
+    return os is OS.LINUX or os is OS.MACOS
diff --git a/project/toolset.py b/project/toolset.py
index 35d5192..73e0852 100644
--- a/project/toolset.py
+++ b/project/toolset.py
@@ -14,9 +14,6 @@ limited to:
 | Windows  | make [1]     | Clang [2] |
 |          |              | MinGW-w64 |
 |          | msbuild      | MSVC      |
-| Cygwin   | make         | Clang     |
-|          |              | GCC       |
-|          |              | MinGW-w64 |
 
 1. Both GNU make and MinGW mingw32-make.
 2. clang-cl is supported by Boost 1.69.0 or higher only.
@@ -472,7 +469,7 @@ class CMakeCustom(Toolset):
             if shutil.which('mingw32-make'):
                 return 'MinGW Makefiles'
             return 'Unix Makefiles'
-        # On Linux/Cygwin, make all the way:
+        # On Linux, make all the way:
         return 'Unix Makefiles'
 
     @staticmethod
diff --git a/project/utils.py b/project/utils.py
index 6697ff7..1be2b55 100644
--- a/project/utils.py
+++ b/project/utils.py
@@ -28,19 +28,12 @@ def full_exe_name(exe):
     if not project.os.on_windows_like():
         # There's no PATHEXT on Linux.
         return exe
-    # b2 on Windows/Cygwin doesn't like it when the executable name doesn't
-    # include the extension.
+    # b2 on Windows doesn't like it when the executable name doesn't include
+    # the extension.
     dir_path = os.path.dirname(exe) or None
     path = shutil.which(exe, path=dir_path)
     if not path:
         raise RuntimeError(f"executable '{exe}' could not be found")
-    if project.os.on_cygwin():
-        # On Cygwin, shutil.which('gcc') == '/usr/bin/gcc' and shutil.which('gcc.exe')
-        # == '/usr/bin/gcc.exe'; we want the latter version.  shutil.which('clang++')
-        # == '/usr/bin/clang++' is fine though, since it _is_ the complete path
-        # (clang++ is a symlink).
-        if os.path.exists(path) and os.path.exists(path + '.exe'):
-            path += '.exe'
     if dir_path:
         # If it was found in a specific directory, include the directory in the
         # result.  shutil.which returns the executable name prefixed with the
-- 
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