Use quieter test output when running tests on Travis CI.

Fixes rust-lang#36788.

.travis.yml

@@ -15,7 +15,7 @@ before_install:
 script:
   - docker run -v `pwd`:/build rust
     sh -c "
-      ./configure --enable-rustbuild --llvm-root=/usr/lib/llvm-3.7 &&
+      ./configure --enable-rustbuild --llvm-root=/usr/lib/llvm-3.7 --enable-quiet-tests &&
       make tidy &&
       make check -j4
     "

configure

@@ -610,6 +610,7 @@ opt docs     1 "build standard library documentation"
 opt compiler-docs     0 "build compiler documentation"
 opt optimize-tests 1 "build tests with optimizations"
 opt debuginfo-tests 0 "build tests with debugger metadata"
+opt quiet-tests 0 "enable quieter output when running tests"
 opt libcpp 1 "build llvm with libc++ instead of libstdc++ when using clang"
 opt llvm-assertions 0 "build LLVM with assertions"
 opt debug-assertions 0 "build with debugging assertions"

src/bootstrap/check.rs

@@ -187,6 +187,10 @@ pub fn compiletest(build: &Build,
         cmd.arg("--verbose");
     }
 
+    if build.config.quiet_tests {
+        cmd.arg("--quiet");
+    }
+
     // Only pass correct values for these flags for the `run-make` suite as it
     // requires that a C++ compiler was configured which isn't always the case.
     if suite == "run-make" {
@@ -277,7 +281,13 @@ fn markdown_test(build: &Build, compiler: &Compiler, markdown: &Path) {
     build.add_rustc_lib_path(compiler, &mut cmd);
     cmd.arg("--test");
     cmd.arg(markdown);
-    cmd.arg("--test-args").arg(build.flags.args.join(" "));
+
+    let mut test_args = build.flags.args.join(" ");
+    if build.config.quiet_tests {
+        test_args.push_str(" --quiet");
+    }
+    cmd.arg("--test-args").arg(test_args);
+
     build.run(&mut cmd);
 }
 
@@ -367,6 +377,11 @@ pub fn krate(build: &Build,
     dylib_path.insert(0, build.sysroot_libdir(compiler, target));
     cargo.env(dylib_path_var(), env::join_paths(&dylib_path).unwrap());
 
+    if build.config.quiet_tests {
+        cargo.arg("--");
+        cargo.arg("--quiet");
+    }
+
     if target.contains("android") {
         build.run(cargo.arg("--no-run"));
         krate_android(build, compiler, target, mode);

src/bootstrap/config.rs

@@ -77,6 +77,7 @@ pub struct Config {
 
     // misc
     pub channel: String,
+    pub quiet_tests: bool,
     // Fallback musl-root for all targets
     pub musl_root: Option<PathBuf>,
     pub prefix: Option<String>,
@@ -338,6 +339,7 @@ impl Config {
                 ("RPATH", self.rust_rpath),
                 ("OPTIMIZE_TESTS", self.rust_optimize_tests),
                 ("DEBUGINFO_TESTS", self.rust_debuginfo_tests),
+                ("QUIET_TESTS", self.quiet_tests),
                 ("LOCAL_REBUILD", self.local_rebuild),
                 ("NINJA", self.ninja),
                 ("CODEGEN_TESTS", self.codegen_tests),