3 files changed, 64 insertions, 0 deletions
diff --git a/tests/run-make-fulldeps/cross-lang-lto/Makefile b/tests/run-make-fulldeps/cross-lang-lto/Makefile
new file mode 100644
index 000000000..92058f952
--- /dev/null
+++ b/tests/run-make-fulldeps/cross-lang-lto/Makefile
@@ -0,0 +1,57 @@
+
+include ../tools.mk
+
+# ignore windows due to libLLVM being present in PATH and the PATH and library path being the same
+# (so fixing it is harder). See #57765 for context
+ifndef IS_WINDOWS
+
+# This test makes sure that the object files we generate are actually
+# LLVM bitcode files (as used by linker LTO plugins) when compiling with
+# -Clinker-plugin-lto.
+
+# this only succeeds for bitcode files
+ASSERT_IS_BITCODE_OBJ=("$(LLVM_BIN_DIR)"/llvm-bcanalyzer $(1))
+EXTRACT_OBJS=(cd $(TMPDIR); rm -f ./*.o; "$(LLVM_BIN_DIR)"/llvm-ar x $(1))
+
+BUILD_LIB=$(RUSTC) lib.rs -Copt-level=2 -Clinker-plugin-lto -Ccodegen-units=1
+BUILD_EXE=$(RUSTC) main.rs -Copt-level=2 -Clinker-plugin-lto -Ccodegen-units=1 --emit=obj
+
+all: staticlib staticlib-fat-lto staticlib-thin-lto rlib exe cdylib rdylib
+
+staticlib: lib.rs
+	$(BUILD_LIB) --crate-type=staticlib -o $(TMPDIR)/liblib.a
+	$(call EXTRACT_OBJS, liblib.a)
+	for file in $(TMPDIR)/liblib.*.rcgu.o; do $(call ASSERT_IS_BITCODE_OBJ, $$file); done
+
+staticlib-fat-lto: lib.rs
+	$(BUILD_LIB) --crate-type=staticlib -o $(TMPDIR)/liblib-fat-lto.a -Clto=fat
+	$(call EXTRACT_OBJS, liblib-fat-lto.a)
+	for file in $(TMPDIR)/liblib-fat-lto.*.rcgu.o; do $(call ASSERT_IS_BITCODE_OBJ, $$file); done
+
+staticlib-thin-lto: lib.rs
+	$(BUILD_LIB) --crate-type=staticlib -o $(TMPDIR)/liblib-thin-lto.a -Clto=thin
+	$(call EXTRACT_OBJS, liblib-thin-lto.a)
+	for file in $(TMPDIR)/liblib-thin-lto.*.rcgu.o; do $(call ASSERT_IS_BITCODE_OBJ, $$file); done
+
+rlib: lib.rs
+	$(BUILD_LIB) --crate-type=rlib -o $(TMPDIR)/liblib.rlib
+	$(call EXTRACT_OBJS, liblib.rlib)
+	for file in $(TMPDIR)/liblib.*.rcgu.o; do $(call ASSERT_IS_BITCODE_OBJ, $$file); done
+
+cdylib: lib.rs
+	$(BUILD_LIB) --crate-type=cdylib --emit=obj -o $(TMPDIR)/cdylib.o
+	$(call ASSERT_IS_BITCODE_OBJ, $(TMPDIR)/cdylib.o)
+
+rdylib: lib.rs
+	$(BUILD_LIB) --crate-type=dylib --emit=obj -o $(TMPDIR)/rdylib.o
+	$(call ASSERT_IS_BITCODE_OBJ, $(TMPDIR)/rdylib.o)
+
+exe: lib.rs
+	$(BUILD_EXE) -o $(TMPDIR)/exe.o
+	$(call ASSERT_IS_BITCODE_OBJ, $(TMPDIR)/exe.o)
+
+else
+
+all:
+
+endif
diff --git a/tests/run-make-fulldeps/cross-lang-lto/lib.rs b/tests/run-make-fulldeps/cross-lang-lto/lib.rs
new file mode 100644
index 000000000..94cfef6ad
--- /dev/null
+++ b/tests/run-make-fulldeps/cross-lang-lto/lib.rs
@@ -0,0 +1,4 @@
+#[no_mangle]
+pub extern "C" fn foo() {
+    println!("abc");
+}
diff --git a/tests/run-make-fulldeps/cross-lang-lto/main.rs b/tests/run-make-fulldeps/cross-lang-lto/main.rs
new file mode 100644
index 000000000..f6320bcb0
--- /dev/null
+++ b/tests/run-make-fulldeps/cross-lang-lto/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello World");
+}