auto merge of #10593 : metajack/rust/pkgid-hash, r=brson

This replaces the link meta attributes with a pkgid attribute and uses a hash
of this as the crate hash. This makes the crate hash computable by things
other than the Rust compiler. It also switches the hash function ot SHA1 since
that is much more likely to be available in shell, Python, etc than SipHash.

Fixes #10188, #8523.

mk/tests.mk

@@ -394,7 +394,8 @@ $(3)/stage$(1)/test/rustdoctest-$(2)$$(X_$(2)):					\
 		$$(RUSTDOC_LIB) $$(RUSTDOC_INPUTS)		\
 		$$(SREQ$(1)_T_$(2)_H_$(3)) \
 		$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_LIBSYNTAX_$(2)) \
-		$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_LIBRUSTC_$(2))
+		$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_LIBRUSTC_$(2)) \
+		$$(SUNDOWN_LIB_$(2))
 	@$$(call E, compile_and_link: $$@)
 	$$(STAGE$(1)_T_$(2)_H_$(3)) -o $$@ $$< --test \
 		-L $$(SUNDOWN_DIR_$(2))

src/driver/driver.rs

@@ -9,15 +9,15 @@
 // except according to those terms.
 
 #[cfg(rustpkg)]
-extern mod this(name = "rustpkg");
+extern mod this = "rustpkg";
 
 #[cfg(rustdoc)]
-extern mod this(name = "rustdoc");
+extern mod this = "rustdoc";
 
 #[cfg(rustc)]
-extern mod this(name = "rustc");
+extern mod this = "rustc";
 
 #[cfg(rustdoc_ng)]
-extern mod this(name = "rustdoc_ng");
+extern mod this = "rustdoc_ng";
 
 fn main() { this::main() }

src/etc/combine-tests.py

@@ -42,6 +42,7 @@ def scrub(b):
 c = open("tmp/run_pass_stage2.rc", "w")
 i = 0
 c.write("// AUTO-GENERATED FILE: DO NOT EDIT\n")
+c.write("#[pkgid=\"run_pass_stage2#0.1\"];\n")
 c.write("#[link(name=\"run_pass_stage2\", vers=\"0.1\")];\n")
 c.write("#[feature(globs, macro_rules, struct_variant, managed_boxes)];\n")
 c.write("#[allow(attribute_usage)];\n")

src/libextra/lib.rs

@@ -20,6 +20,8 @@ Rust extras are part of the standard Rust distribution.
 
 */
 
+#[pkgid="extra#0.9-pre"];
+// NOTE: remove after the next snapshot
 #[link(name = "extra",
        package_id = "extra",
        vers = "0.9-pre",