Test wholearchive on rust staticlib

Author: ChrisDenton

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 std::path::Path;
+
+use run_make_support::{cc, env_var, extra_c_flags, rustc};
+
+fn main() {
+    // FIXME: Make this test either work with or ignore LLVM.
+    if false {
+        return;
+    }
+    // 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 test for `cl.exe` to ensure we're using MSVC's tools and not the LLVM equivalents.
+
+    if env_var("CC").ends_with("cl.exe") {
+        cc().input("c.c")
+            .args([
+                "-MT",
+                "-link",
+                "-WHOLEARCHIVE:./static.lib",
+                "-dll",
+                "-def:dll.def",
+                "-out:dll.dll",
+            ])
+            .args(extra_c_flags())
+            .run();
+    }
+
+    // As a sanity check, make sure it works without /WHOLEARCHIVE
+    cc().input("c.c")
+        .args(["-MT", "-link", "./static.lib", "-dll", "-def:dll.def", "-out:dll2.dll"])
+        .args(extra_c_flags())
+        .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
+}