travis: Add a distcheck target

This commit adds a new entry to the Travis matrix which performs a "distcheck",
which basically means that we create a tarball, extract that tarball, and then
build/test inside there. This ensures that the tarballs we produce are actually
able to be built/tested!

Along the way this also updates the rustbuild distcheck definition to propagate
the configure args from the top-level invocation.

Closes #38691

3 files changed, 9 insertions, 2 deletions

diff --git a/src/bootstrap/check.rs b/src/bootstrap/check.rs
index ec0243908ed..0c6680fab66 100644
--- a/src/bootstrap/check.rs
+++ b/src/bootstrap/check.rs
@@ -554,6 +554,7 @@ pub fn distcheck(build: &Build) {
        .current_dir(&dir);
     build.run(&mut cmd);
     build.run(Command::new("./configure")
+                     .args(&build.config.configure_args)
                      .current_dir(&dir));
     build.run(Command::new(build_helper::make(&build.config.build))
                      .arg("check")
diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index 9767afd73ca..11c5b374ed9 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -94,6 +94,7 @@ pub struct Config {
     pub nodejs: Option<PathBuf>,
     pub gdb: Option<PathBuf>,
     pub python: Option<PathBuf>,
+    pub configure_args: Vec<String>,
 }
 
 /// Per-target configuration stored in the global configuration structure.
@@ -519,6 +520,11 @@ impl Config {
                 "CFG_ENABLE_SCCACHE" if value == "1" => {
                     self.ccache = Some("sccache".to_string());
                 }
+                "CFG_CONFIGURE_ARGS" if value.len() > 0 => {
+                    self.configure_args = value.split_whitespace()
+                                               .map(|s| s.to_string())
+                                               .collect();
+                }
                 _ => {}
             }
         }
diff --git a/src/bootstrap/util.rs b/src/bootstrap/util.rs
index c9e756b6f99..2ab3776ada0 100644
--- a/src/bootstrap/util.rs
+++ b/src/bootstrap/util.rs
@@ -76,9 +76,9 @@ pub fn cp_r(src: &Path, dst: &Path) {
 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
 /// when this function is called. Unwanted files or directories can be skipped
 /// by returning `false` from the filter function.
-pub fn cp_filtered<F: Fn(&Path) -> bool>(src: &Path, dst: &Path, filter: &F) {
+pub fn cp_filtered(src: &Path, dst: &Path, filter: &Fn(&Path) -> bool) {
     // Inner function does the actual work
-    fn recurse<F: Fn(&Path) -> bool>(src: &Path, dst: &Path, relative: &Path, filter: &F) {
+    fn recurse(src: &Path, dst: &Path, relative: &Path, filter: &Fn(&Path) -> bool) {
         for f in t!(fs::read_dir(src)) {
             let f = t!(f);
             let path = f.path();