Add a test for issue 47384

Author: nbdd0121

src/test/run-make/issue-47384/Makefile

@@ -0,0 +1,12 @@
+-include ../../run-make-fulldeps/tools.mk
+
+# ignore-windows
+# ignore-cross-compile
+
+all: main.rs
+	$(RUSTC) --crate-type lib lib.rs
+	$(RUSTC) --crate-type cdylib -Clink-args="-Tlinker.ld" main.rs
+	# Ensure `#[used]` and `KEEP`-ed section is there
+	objdump -s -j".static" $(TMPDIR)/libmain.so
+	# Ensure `#[no_mangle]` symbol is there
+	nm $(TMPDIR)/libmain.so | $(CGREP) bar

src/test/run-make/issue-47384/lib.rs

@@ -0,0 +1,12 @@
+mod foo {
+    #[link_section = ".rodata.STATIC"]
+    #[used]
+    static STATIC: [u32; 10] = [1; 10];
+}
+
+mod bar {
+    #[no_mangle]
+    extern "C" fn bar() -> i32 {
+        0
+    }
+}

src/test/run-make/issue-47384/linker.ld

@@ -0,0 +1,7 @@
+SECTIONS
+{
+    .static : ALIGN(4)
+    {
+        KEEP(*(.rodata.STATIC));
+    }
+}

src/test/run-make/issue-47384/main.rs

@@ -0,0 +1 @@
+extern crate lib;