Install mlx.dll into the same dir with python bindings on Windows (#1690)

* Install mlx.dll into the same dir with python bindings on Windows

* Set BUILD_SHARED_LIBS for dlfcn-win32

* Update cmake requirements to 3.25

* Fix cmake style

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.24)
+cmake_minimum_required(VERSION 3.25)
 
 project(mlx LANGUAGES C CXX)
 
@@ -126,7 +126,10 @@ if(WIN32)
     GIT_REPOSITORY https://github.com/dlfcn-win32/dlfcn-win32.git
     GIT_TAG v1.4.1
     EXCLUDE_FROM_ALL)
+  block()
+  set(BUILD_SHARED_LIBS OFF)
   FetchContent_MakeAvailable(dlfcn-win32)
+  endblock()
   target_include_directories(mlx PRIVATE "${dlfcn-win32_SOURCE_DIR}/src")
   target_link_libraries(mlx PRIVATE dl)
 endif()
@@ -264,7 +267,10 @@ install(
   EXPORT MLXTargets
   LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
   ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+  RUNTIME
+    DESTINATION
+      # On Windows, DLLs must be put in the same dir with the python bindings.
+      $<IF:$<BOOL:${WIN32}>,${CMAKE_INSTALL_PREFIX},${CMAKE_INSTALL_BINDIR}>
   INCLUDES
   DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 

docs/src/install.rst

@@ -53,7 +53,7 @@ Build Requirements
 ^^^^^^^^^^^^^^^^^^
 
 - A C++ compiler with C++17 support (e.g. Clang >= 5.0)
-- `cmake <https://cmake.org/>`_ -- version 3.24 or later, and ``make``
+- `cmake <https://cmake.org/>`_ -- version 3.25 or later, and ``make``
 - Xcode >= 15.0 and macOS SDK >= 14.0
 
 .. note::

examples/extensions/pyproject.toml

@@ -1,7 +1,7 @@
 [build-system]
 requires = [
   "setuptools>=42",
-  "cmake>=3.24",
+  "cmake>=3.25",
   "mlx>=0.18.0",
   "nanobind==2.2.0",
 ]

examples/extensions/requirements.txt

@@ -1,4 +1,4 @@
 setuptools>=42
-cmake>=3.24
+cmake>=3.25
 mlx>=0.21.0
 nanobind==2.2.0

pyproject.toml

@@ -2,6 +2,6 @@
 requires = [
   "setuptools>=42",
   "nanobind==2.2.0",
-  "cmake>=3.24",
+  "cmake>=3.25",
 ]
 build-backend = "setuptools.build_meta"