Rollup merge of #119162 - heiher:direct-access-external-data, r=petrochenkov

Add unstable `-Z direct-access-external-data` cmdline flag for `rustc`

The new flag has been described in the Major Change Proposal at https://github.com/rust-lang/compiler-team/issues/707

Fixes #118053

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/codegen/direct-access-external-data.rs b/tests/codegen/direct-access-external-data.rs
new file mode 100644
index 00000000000..ec4bfc33518
--- /dev/null
+++ b/tests/codegen/direct-access-external-data.rs
@@ -0,0 +1,21 @@
+// only-loongarch64-unknown-linux-gnu
+
+// revisions: DEFAULT DIRECT INDIRECT
+// [DEFAULT] compile-flags: -C relocation-model=static
+// [DIRECT] compile-flags: -C relocation-model=static -Z direct-access-external-data=yes
+// [INDIRECT] compile-flags: -C relocation-model=static -Z direct-access-external-data=no
+
+#![crate_type = "rlib"]
+
+// DEFAULT: @VAR = external {{.*}} global i32
+// DIRECT: @VAR = external dso_local {{.*}} global i32
+// INDIRECT: @VAR = external {{.*}} global i32
+
+extern "C" {
+    static VAR: i32;
+}
+
+#[no_mangle]
+pub fn get() -> i32 {
+    unsafe { VAR }
+}