try manual __imp_ dereference

glib/gobject-sys/build.rs

@@ -2,8 +2,6 @@
 // from gir-files (https://github.com/gtk-rs/gir-files)
 // DO NOT EDIT
 
-mod build_manual;
-
 #[cfg(not(docsrs))]
 use std::process;
 
@@ -16,6 +14,4 @@ fn main() {
         println!("cargo:warning={s}");
         process::exit(1);
     }
-
-    build_manual::main();
 }

glib/gobject-sys/src/manual.rs

@@ -1,10 +1,39 @@
 use glib_sys::GType;
 
-// `g_param_spec_types` extern binding generated by build.rs
-include!(concat!(env!("OUT_DIR"), "/param_spec.rs"));
+#[cfg(not(target_os = "windows"))]
+pub type GParamSpecType = *const GType;
 
-/// # Safety
-/// This should be safe as long as the offset added to g_param_spec_types is in bounds.
-pub unsafe fn g_param_spec_types_get_type(offset: usize) -> GType {
-    *g_param_spec_types.add(offset)
+#[cfg(target_os = "windows")]
+pub type GParamSpecType = usize;
+
+#[repr(C)]
+pub struct GParamSpecTypesWrapper(&'static GParamSpecType);
+
+unsafe impl Sync for GParamSpecTypesWrapper {}
+
+impl GParamSpecTypesWrapper {
+    unsafe fn get_ptr(&self) -> *const GType {
+        if cfg!(target_os = "windows") {
+            *(*self.0 as *const *const GType)
+        } else {
+            *self.0 as *const GType
+        }
+    }
+
+    /// # Safety
+    /// This should be safe as long as the offset added to g_param_spec_types is in bounds.
+    pub unsafe fn get_type(&self, offset: usize) -> GType {
+        *(self.get_ptr()).add(offset)
+    }
 }
+
+extern "C" {
+    #[cfg_attr(target_os = "windows", link_name = "__imp_g_param_spec_types")]
+    static g_param_spec_types: GParamSpecType;
+}
+
+pub static g_param_spec_types_ref: GParamSpecTypesWrapper =
+    unsafe { GParamSpecTypesWrapper(&g_param_spec_types) };
+
+//#[cfg(all(target_env = "msvc", not(feature = "static")))]
+//pub static __imp_g_param_spec_types: &'static GParamSpecTypes = unsafe { &g_param_spec_types };

glib/src/param_spec.rs

@@ -302,7 +302,7 @@ macro_rules! define_param_spec {
             #[inline]
             fn static_type() -> Type {
                 unsafe {
-                    from_glib(gobject_ffi::g_param_spec_types_get_type($rust_type_offset))
+                    from_glib(gobject_sys::g_param_spec_types_ref.get_type($rust_type_offset))
                 }
             }
         }