Add test for separate pipelined builds

Make sure the resulting executable is 1) linkable, and 2) the same
as built with `--emit metadata,link`.

Author: jsgf

src/test/run-make/pipelined/Makefile

@@ -1,15 +1,33 @@
 -include ../../run-make-fulldeps/tools.mk
 
-O=$(TMPDIR)
+O=$(TMPDIR)/together
+S=$(TMPDIR)/separate
 
-all: $O/main
-	$O/main
+all: $O/main $S/main
+	# Should produce identical output
+	cmp $O/main	$S/main
 
+# Build with combined --emit metadata,link
 $O/main: $O/libmiddle.rlib $O/libleaf.rlib
-	$(RUSTC) main.rs --extern middle=$O/libmiddle.rlib -Ldependency=$O
+	$(BARE_RUSTC) --out-dir $O main.rs --extern middle=$O/libmiddle.rlib -Ldependency=$O
+	$O/main
 
 $O/libmiddle.rlib: middle.rs $O/libleaf.rmeta
-	$(RUSTC) --emit link middle.rs --extern leaf=$O/libleaf.rmeta
+	$(BARE_RUSTC) --out-dir $O --emit link middle.rs --extern leaf=$O/libleaf.rmeta
 
 $O/libleaf.rlib $O/libleaf.rmeta: leaf.rs
-	$(RUSTC) --emit metadata,link leaf.rs
+	$(BARE_RUSTC) --out-dir $O --emit metadata,link leaf.rs
+
+# Build with separate --emit metadata / --emit link
+$S/main: $S/libmiddle.rlib $S/libleaf.rlib
+	$(BARE_RUSTC) --out-dir $S main.rs --extern middle=$S/libmiddle.rlib -Ldependency=$S
+	$S/main
+
+$S/libmiddle.rlib: middle.rs $S/libleaf.rmeta
+	$(BARE_RUSTC) --out-dir $S --emit link middle.rs --extern leaf=$S/libleaf.rmeta
+
+$S/libleaf.rlib: leaf.rs
+	$(BARE_RUSTC) --out-dir $S --emit link leaf.rs
+
+$S/libleaf.rmeta: leaf.rs
+	$(BARE_RUSTC) --out-dir $S --emit metadata -Zmetadata-link leaf.rs

src/test/run-make/pipelined/leaf.rs

@@ -20,6 +20,11 @@ pub fn simple(a: u32, b: u32) -> u32 {
     c
 }
 
+#[inline]
+pub fn inlined(a: u32, b: u32) -> u32 {
+    a * b
+}
+
 pub fn generic<D: std::fmt::Debug>(d: D) {
     println!("generically printing {:?}", d);
 }

src/test/run-make/pipelined/main.rs

@@ -6,4 +6,5 @@ fn main() {
     println!("middle::BAR {}", middle::BAR);
 
     assert_eq!(middle::simple(2, 3), 5);
+    assert_eq!(middle::inlined(2, 3), 6);
 }

src/test/run-make/pipelined/middle.rs

@@ -5,6 +5,7 @@ extern crate leaf;
 pub static BAR: &str = leaf::FOO;
 
 pub use leaf::simple;
+pub use leaf::inlined;
 
 pub fn do_a_thing() {
     let s = leaf::GenericStruct {