Small hotfix for venvs

Author: timkpaine

hatch_cpp/toolchains/common.py

@@ -4,7 +4,7 @@
 from pathlib import Path
 from re import match
 from shutil import which
-from sys import executable, platform as sys_platform
+from sys import base_exec_prefix, exec_prefix, platform as sys_platform
 from sysconfig import get_path
 from typing import Any, List, Literal, Optional
 
@@ -230,8 +230,13 @@ def get_link_flags(self, library: HatchCppLibrary, build_type: BuildType = "rele
             flags += " /LD"
             flags += f" /Fe:{library.get_qualified_name(self.platform)}"
             flags += " /link /DLL"
-            if (Path(executable).parent / "libs").exists():
-                flags += f" /LIBPATH:{str(Path(executable).parent / 'libs')}"
+            # Add Python library directories, mirroring CPython's distutils behavior.
+            # In virtual environments, sys.executable is in the venv, but pythonXX.lib
+            # lives under the base Python installation's 'libs' directory.
+            for prefix in dict.fromkeys((exec_prefix, base_exec_prefix)):
+                libs_dir = Path(prefix) / "libs"
+                if libs_dir.exists():
+                    flags += f" /LIBPATH:{libs_dir}"
             flags += " " + " ".join(f"{lib}.lib" for lib in library.libraries)
             flags += " " + " ".join(f"/LIBPATH:{lib}" for lib in library.library_dirs)
         # clean