Fix shared library not exporting symbols on Windows (#1684)

* Fix shared library not exporting symbols on Windows

* Function name style

mlx/CMakeLists.txt

@@ -23,6 +23,11 @@ if(MSVC)
   target_compile_options(mlx PUBLIC /wd4068 /wd4244 /wd4267 /wd4804)
 endif()
 
+if(WIN32)
+  # Export symbols by default to behave like macOS/linux.
+  set_target_properties(mlx PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
+endif()
+
 if(MLX_BUILD_CPU)
   add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/backend/common)
 else()

mlx/utils.cpp

@@ -56,7 +56,10 @@ inline void PrintFormatter::print(std::ostream& os, complex64_t val) {
   os << val;
 }
 
-PrintFormatter global_formatter;
+PrintFormatter& get_global_formatter() {
+  static PrintFormatter formatter;
+  return formatter;
+}
 
 Dtype result_type(const std::vector<array>& arrays) {
   Dtype t = bool_;
@@ -171,7 +174,7 @@ void print_subarray(std::ostream& os, const array& a, size_t index, int dim) {
       i = n - num_print - 1;
       index += s * (n - 2 * num_print - 1);
     } else if (is_last) {
-      global_formatter.print(os, a.data<T>()[index]);
+      get_global_formatter().print(os, a.data<T>()[index]);
     } else {
       print_subarray<T>(os, a, index, dim + 1);
     }
@@ -187,7 +190,7 @@ void print_array(std::ostream& os, const array& a) {
   os << "array(";
   if (a.ndim() == 0) {
     auto data = a.data<T>();
-    global_formatter.print(os, data[0]);
+    get_global_formatter().print(os, data[0]);
   } else {
     print_subarray<T>(os, a, 0, 0);
   }

mlx/utils.h

@@ -51,7 +51,7 @@ struct PrintFormatter {
   bool capitalize_bool{false};
 };
 
-extern PrintFormatter global_formatter;
+PrintFormatter& get_global_formatter();
 
 /** The type from promoting the arrays' types with one another. */
 inline Dtype result_type(const array& a, const array& b) {

python/src/array.cpp

@@ -85,7 +85,7 @@ class ArrayPythonIterator {
 
 void init_array(nb::module_& m) {
   // Set Python print formatting options
-  mlx::core::global_formatter.capitalize_bool = true;
+  get_global_formatter().capitalize_bool = true;
 
   // Types
   nb::class_<Dtype>(