Auto merge of #134918 - ChrisDenton:issue-70093, r=<try>

Windows: Enable issue 70093 link tests

`-Zlink-native-libraries=no` and `-Zlink-directives=no` *should* work on Windows, at least for msvc. The fly in ointment is that `default-linker-libraries` doesn't. On unixy platforms rustc calls another compiler which in turn calls the linker along with the default libraries. On MSVC rustc calls the linker directly therefore it would need to be the one to implement `default-linker-libraries`. Except it doesn't so we workaround that in the test by using `-C link-arg` to talk to the linker.

Marking as draft while I test if it actually *does* work,

try-job: x86_64-msvc
try-job: i686-msvc

Author: bors

src/tools/tidy/src/issues.txt

@@ -2710,8 +2710,6 @@ ui/limits/issue-75158-64.rs
 ui/link-native-libs/issue-109144.rs
 ui/link-native-libs/issue-43925.rs
 ui/link-native-libs/issue-43926.rs
-ui/link-native-libs/issue-70093/issue-70093-link-directives.rs
-ui/link-native-libs/issue-70093/issue-70093.rs
 ui/linkage-attr/auxiliary/issue-12133-dylib.rs
 ui/linkage-attr/auxiliary/issue-12133-dylib2.rs
 ui/linkage-attr/auxiliary/issue-12133-rlib.rs

tests/ui/link-native-libs/issue-70093/issue-70093-link-directives.rs renamed to tests/ui/link-native-libs/issue-70093/link-directives.rs

@@ -1,6 +1,5 @@
 //@ run-pass
 //@ compile-flags: -Zlink-directives=no
-//@ ignore-windows - this will probably only work on unixish systems
 //@ ignore-fuchsia - missing __libc_start_main for some reason (#84733)
 //@ ignore-cross-compile - default-linker-libraries=yes doesn't play well with cross compiling
 

tests/ui/link-native-libs/issue-70093/link-native-libraries-msvc.rs

@@ -0,0 +1,14 @@
+// On Windows MSVC, default-linker-libraries=yes doesn't work because
+// rustc drives the linker directly instead of going through another compiler.
+// Therefore rustc would need to implement default-linker-libraries itself but doesn't.
+// So instead we use -Clink-arg to directly set the required msvcrt.lib as a link arg.
+
+//@ run-pass
+//@ compile-flags: -Zlink-native-libraries=no -Clink-arg=msvcrt.lib
+//@ only-msvc
+//@ ignore-cross-compile
+
+#[link(name = "some-random-non-existent-library", kind = "static")]
+extern "C" {}
+
+fn main() {}