Add test for MSVC WHOLEARCHIVE

tests/run-make/msvc-wholearchive/c.c

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+// This page is intentionally left blank

tests/run-make/msvc-wholearchive/dll.def

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+LIBRARY dll
+EXPORTS
+        hello
+        number

tests/run-make/msvc-wholearchive/rmake.rs

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+//@ only-msvc
+// Reason: this is testing the MSVC linker
+
+// This is a regression test for #129020
+// It ensures we can link a rust staticlib into DLL using the MSVC linker
+
+use run_make_support::run::cmd;
+use run_make_support::rustc;
+
+fn main() {
+    // Build the staticlib
+    rustc().crate_type("staticlib").input("static.rs").output("static.lib").run();
+    // Create an empty obj file (using the C compiler)
+    // Then use it to link in the staticlib using `/WHOLEARCHIVE` and produce a DLL.
+    // We call link.exe directly because this test is only for MSVC and not their LLVM equivalents
+    cmd("cl.exe").args(&["c.c", "-nologo", "-c", "-MT"]).run();
+    cmd("link.exe")
+        .args(&["c", "/WHOLEARCHIVE:./static.lib", "/dll", "/def:dll.def", "/out:dll.dll"])
+        // Import libs
+        .args(&["libcmt.lib", "kernel32.lib", "ws2_32.lib", "ntdll.lib", "userenv.lib"])
+        .run();
+}

tests/run-make/msvc-wholearchive/static.rs

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+#[no_mangle]
+pub extern "C" fn hello() {
+    println!("Hello world!");
+}
+
+#[no_mangle]
+pub extern "C" fn number() -> u32 {
+    42
+}