Make codegen test for remap-path-prefix more thorough.

Author: michaelwoerister

src/test/codegen/remap_path_prefix.rs renamed to src/test/codegen/remap_path_prefix/auxiliary/remap_path_prefix_aux.rs

@@ -10,10 +10,9 @@
 
 // ignore-tidy-linelength
 
-// compile-flags: -g -Zremap-path-prefix-from={{cwd}} -Zremap-path-prefix-to=/the/cwd -Zremap-path-prefix-from={{src-base}} -Zremap-path-prefix-to=/the/src
+// compile-flags: -g  -Zremap-path-prefix-from={{cwd}} -Zremap-path-prefix-to=/the/aux-cwd -Zremap-path-prefix-from={{src-base}}/remap_path_prefix/auxiliary -Zremap-path-prefix-to=/the/aux-src
 
-// CHECK: !DIFile(filename: "/the/src/remap_path_prefix.rs", directory: "/the/cwd")
-
-fn main() {
-    // We just check that the DIFile got remapped properly.
+#[inline]
+pub fn some_aux_function() -> i32 {
+    1234
 }

src/test/codegen/remap_path_prefix/main.rs

@@ -0,0 +1,30 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// ignore-tidy-linelength
+
+// compile-flags: -g  -C no-prepopulate-passes -Zremap-path-prefix-from={{cwd}} -Zremap-path-prefix-to=/the/cwd -Zremap-path-prefix-from={{src-base}} -Zremap-path-prefix-to=/the/src
+// aux-build:remap_path_prefix_aux.rs
+
+extern crate remap_path_prefix_aux;
+
+// Here we check that the expansion of the file!() macro is mapped.
+// CHECK: internal constant [34 x i8] c"/the/src/remap_path_prefix/main.rs"
+pub static FILE_PATH: &'static str = file!();
+
+fn main() {
+    remap_path_prefix_aux::some_aux_function();
+}
+
+// Here we check that local debuginfo is mapped correctly.
+// CHECK: !DIFile(filename: "/the/src/remap_path_prefix/main.rs", directory: "/the/cwd")
+
+// And here that debuginfo from other crates are expanded to absolute paths.
+// CHECK: !DIFile(filename: "/the/aux-src/remap_path_prefix_aux.rs", directory: "")