test: add rust import tests

Author: Snowy1803

test/functional/IRDec/import-rust.glu

@@ -0,0 +1,14 @@
+//
+// RUN: mkdir -p %t
+// RUN: rustc --crate-type=lib --emit=llvm-ir -g %S/simple.rs -o %t/example.ll
+// RUN: gluc %s -I %t -o %t/import-rust && %t/import-rust | FileCheck -v %s
+//
+
+import example;
+
+@no_mangling @c_variadic func printf(s: *Char) -> Int;
+
+func main() {
+    // CHECK: Pizza count is 42, compiler is Rust
+    printf("Pizza count is %d, compiler is %.*s\n", example::get_pizza_count(), example::get_cc().length, example::get_cc().data_ptr);
+}

test/functional/IRDec/simple.rs

@@ -0,0 +1,23 @@
+//
+// RUN: rustc --crate-type=lib --emit=llvm-ir -g %s -o %t.ll
+// RUN: gluc %t.ll -print-interface | FileCheck -v %s
+//
+
+#![no_main]
+
+// CHECK: @linkage_name({{.*}}) public func get_pizza_count() -> UInt64;
+pub fn get_pizza_count() -> u64
+{
+    42
+}
+
+// CHECK: @linkage_name({{.*}}) public func get_cc() -> [[STRUCT_NAME:.*]];
+pub fn get_cc() -> &'static str
+{
+    "Rust"
+}
+
+// CHECK: struct [[STRUCT_NAME]] {
+// CHECK-NEXT:    data_ptr: *UInt8,
+// CHECK-NEXT:    length: UInt64,
+// CHECK-NEXT: }

test/functional/lit.cfg.in

@@ -3,7 +3,7 @@ import os
 
 config.name = "Glu functional tests"
 config.test_format = lit.formats.ShTest(execute_external=True)
-config.suffixes = ['.glu', '.c', '.cpp']
+config.suffixes = ['.glu', '.c', '.cpp', '.rs']
 
 # Add LLVM tools directory to PATH
 llvm_tools_dir = '@LLVM_TOOLS_BINARY_DIR@'