auto merge of #5410 : luqmana/rust/cfg-and, r=graydon

This adopts the syntax from #2119. No more annoying workarounds involving wrapping in mods!

src/compiletest/runtest.rs

@@ -208,18 +208,19 @@ actual:\n\
                         testfile: &Path, src: ~str) -> ProcRes {
         compose_and_run_compiler(
             config, props, testfile,
-            make_typecheck_args(config, testfile),
+            make_typecheck_args(config, props, testfile),
             Some(src))
     }
 
-    fn make_typecheck_args(config: config, testfile: &Path) -> ProcArgs {
+    fn make_typecheck_args(config: config, props: TestProps, testfile: &Path) -> ProcArgs {
         let prog = config.rustc_path;
         let mut args = ~[~"-",
                          ~"--no-trans", ~"--lib",
                          ~"-L", config.build_base.to_str(),
                          ~"-L",
                          aux_output_dir_name(config, testfile).to_str()];
         args += split_maybe_args(config.rustcflags);
+        args += split_maybe_args(props.compile_flags);
         return ProcArgs {prog: prog.to_str(), args: args};
     }
 }

src/librustc/front/config.rs

@@ -185,18 +185,19 @@ pub fn metas_in_cfg(cfg: ast::crate_cfg,
     // Pull the inner meta_items from the #[cfg(meta_item, ...)]  attributes,
     // so we can match against them. This is the list of configurations for
     // which the item is valid
-    let cfg_metas =
-        vec::concat(
-            vec::filter_map(cfg_metas, |i| attr::get_meta_item_list(i)));
-
-    let has_cfg_metas = vec::len(cfg_metas) > 0u;
-    if !has_cfg_metas { return true; }
-
-    for cfg_metas.each |cfg_mi| {
-        if attr::contains(cfg, *cfg_mi) { return true; }
-    }
-
-    return false;
+    let cfg_metas = vec::filter_map(cfg_metas, |i| attr::get_meta_item_list(i));
+
+    if cfg_metas.all(|c| c.is_empty()) { return true; }
+
+    cfg_metas.any(|cfg_meta| {
+        cfg_meta.all(|cfg_mi| {
+            match cfg_mi.node {
+                ast::meta_list(s, ref it) if *s == ~"not"
+                    => it.all(|mi| !attr::contains(cfg, *mi)),
+                _ => attr::contains(cfg, *cfg_mi)
+            }
+        })
+    })
 }
 
 

src/test/compile-fail/test-cfg.rs

@@ -0,0 +1,18 @@
+// Copyright 2012 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.
+
+// compile-flags: --cfg foo
+
+#[cfg(foo, bar)] // foo AND bar
+fn foo() {}
+
+fn main() {
+    foo(); //~ ERROR unresolved name: `foo`.
+}

src/test/run-pass/cfgs-on-items.rs

@@ -0,0 +1,31 @@
+// Copyright 2012 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.
+
+// xfail-fast
+// compile-flags: --cfg fooA --cfg fooB
+
+// fooA AND !bar
+#[cfg(fooA, not(bar))]
+fn foo1() -> int { 1 }
+
+// !fooA AND !bar
+#[cfg(not(fooA, bar))]
+fn foo2() -> int { 2 }
+
+// fooC OR (fooB AND !bar)
+#[cfg(fooC)]
+#[cfg(fooB, not(bar))]
+fn foo2() -> int { 3 }
+
+
+fn main() {
+    fail_unless!(1 == foo1());
+    fail_unless!(3 == foo2());
+}