STUFF

test2/Makefile

@@ -1,7 +1,7 @@
 SHELL = bash
-RUSTC = rustc --target x86_64-pc-windows-msvc -Cpanic=abort -Clinker=lld-link -Clink-arg=/NODEFAULTLIB -Clink-arg=/debug:none -Cdebuginfo=0
+RUSTC = rustc --target x86_64-pc-windows-msvc -Copt-level=3 -Cpanic=abort -Clinker=lld-link -Clink-arg=/NODEFAULTLIB -Clink-arg=/debug:none -Cdebuginfo=0
 
-build: empty_exe.exe one_dll.exe
+build: empty_exe.exe one_dll.exe two_dll.exe
 
 empty_exe.exe: empty_exe.rs
 	$(RUSTC) empty_exe.rs
@@ -12,6 +12,12 @@ one_dll.exe: one_dll.rs small_dll.dll
 small_dll.dll: small_dll.rs
 	$(RUSTC) small_dll.rs
 
+ordinal_dll.dll: ordinal_dll.rs ordinal_dll.def
+	$(RUSTC) -Clink-arg=/def:ordinal_dll.def ordinal_dll.rs
+
+two_dll.exe: small_dll.dll ordinal_dll.dll
+	$(RUSTC) two_dll.rs
+
 .PHONY: clean
 clean:
 	shopt -s nullglob

test2/ordinal_dll.def

@@ -0,0 +1,4 @@
+EXPORTS
+    my_export_ordinal_1 @1
+    my_export_ordinal_2 @2        
+    my_export_named

test2/ordinal_dll.rs

@@ -0,0 +1,28 @@
+#![no_std]
+#![crate_type = "cdylib"]
+#![windows_subsystem = "console"]
+
+#[panic_handler]
+fn handle_panic(_: &core::panic::PanicInfo<'_>) -> ! {
+    loop {}
+}
+
+#[no_mangle]
+pub extern "C" fn my_export_ordinal_1() -> u32 {
+    1
+}
+
+#[no_mangle]
+pub extern "C" fn my_export_ordinal_2() -> u32 {
+    2
+}
+
+#[no_mangle]
+pub extern "C" fn my_export_named() -> u32 {
+    5
+}
+
+#[no_mangle]
+pub extern "stdcall" fn _DllMainCRTStartup() -> u32 {
+    0
+}

test2/two_dll.rs

@@ -0,0 +1,30 @@
+#![no_std]
+#![no_main]
+#![windows_subsystem = "console"]
+
+#[link(name = "small_dll", kind = "raw-dylib")]
+unsafe extern "C" {
+    safe fn my_export() -> u32;
+}
+
+#[link(name = "ordinal_dll", kind = "raw-dylib")]
+unsafe extern "C" {
+    #[link_ordinal(1)]
+    safe fn my_export_ordinal_1() -> u32;
+    #[link_ordinal(2)]
+    safe fn my_export_ordinal_2() -> u32;
+    safe fn my_export_named() -> u32;
+}
+
+#[panic_handler]
+fn handle_panic(_: &core::panic::PanicInfo<'_>) -> ! {
+    loop {}
+}
+
+#[no_mangle]
+pub extern "stdcall" fn mainCRTStartup() -> u32 {
+    my_export()
+        .wrapping_add(my_export_ordinal_1())
+        .wrapping_add(my_export_ordinal_2())
+        .wrapping_add(my_export_named())
+}