build/test the sanitizers only when --enable-sanitizers is used

configure

@@ -649,6 +649,7 @@ opt codegen-tests 1 "run the src/test/codegen tests"
 opt option-checking 1 "complain about unrecognized options in this configure script"
 opt ninja 0 "build LLVM using the Ninja generator (for MSVC, requires building in the correct environment)"
 opt vendor 0 "enable usage of vendored Rust crates"
+opt sanitizers 0 "build the sanitizer runtimes (asan, lsan, msan, tsan)"
 
 # Optimization and debugging options. These may be overridden by the release channel, etc.
 opt_nosave optimize 1 "build optimized rust code"

src/bootstrap/check.rs

@@ -236,6 +236,10 @@ pub fn compiletest(build: &Build,
     cmd.env("RUSTC_BOOTSTRAP", "1");
     build.add_rust_test_threads(&mut cmd);
 
+    if build.config.sanitizers {
+        cmd.env("SANITIZER_SUPPORT", "1");
+    }
+
     cmd.arg("--adb-path").arg("adb");
     cmd.arg("--adb-test-dir").arg(ADB_TEST_DIR);
     if target.contains("android") {
@@ -332,10 +336,7 @@ pub fn krate(build: &Build,
              krate: Option<&str>) {
     let (name, path, features, root) = match mode {
         Mode::Libstd => {
-            ("libstd",
-             "src/rustc/std_shim",
-             build.std_features(),
-             "std_shim")
+            ("libstd", "src/rustc/std_shim", build.std_features(), "std_shim")
         }
         Mode::Libtest => {
             ("libtest", "src/rustc/test_shim", String::new(), "test_shim")

src/bootstrap/compile.rs

@@ -52,15 +52,14 @@ pub fn std(build: &Build, target: &str, compiler: &Compiler) {
         features.push_str(" force_alloc_system");
     }
 
-    if compiler.stage != 0 && !build.system_llvm(target) {
+    if compiler.stage != 0 && build.config.sanitizers {
         // This variable is used by the sanitizer runtime crates, e.g.
         // rustc_lsan, to build the sanitizer runtime from C code
         // When this variable is missing, those crates won't compile the C code,
         // so we don't set this variable during stage0 where llvm-config is
         // missing
-        // We also don't build the runtimes when compiling against system llvm
-        // because some distributions ship llvm packages that have a directory
-        // layout different from the one that the runtime's build system expects
+        // We also only build the runtimes when --enable-sanitizers (or its
+        // config.toml equivalent) is used
         cargo.env("LLVM_CONFIG", build.llvm_config(target));
     }
     cargo.arg("--features").arg(features)

src/bootstrap/config.rs

@@ -48,6 +48,7 @@ pub struct Config {
     pub target_config: HashMap<String, Target>,
     pub full_bootstrap: bool,
     pub extended: bool,
+    pub sanitizers: bool,
 
     // llvm codegen options
     pub llvm_assertions: bool,
@@ -108,8 +109,6 @@ pub struct Config {
 /// Per-target configuration stored in the global configuration structure.
 #[derive(Default)]
 pub struct Target {
-    // `true` if compiling against system LLVM or a pre-built LLVM
-    pub system_llvm: bool,
     pub llvm_config: Option<PathBuf>,
     pub jemalloc: Option<PathBuf>,
     pub cc: Option<PathBuf>,
@@ -150,6 +149,7 @@ struct Build {
     python: Option<String>,
     full_bootstrap: Option<bool>,
     extended: Option<bool>,
+    sanitizers: Option<bool>,
 }
 
 /// TOML representation of various global install decisions.
@@ -294,6 +294,7 @@ impl Config {
         set(&mut config.vendor, build.vendor);
         set(&mut config.full_bootstrap, build.full_bootstrap);
         set(&mut config.extended, build.extended);
+        set(&mut config.sanitizers, build.sanitizers);
 
         if let Some(ref install) = toml.install {
             config.prefix = install.prefix.clone().map(PathBuf::from);
@@ -437,6 +438,7 @@ impl Config {
                 ("VENDOR", self.vendor),
                 ("FULL_BOOTSTRAP", self.full_bootstrap),
                 ("EXTENDED", self.extended),
+                ("SANITIZERS", self.sanitizers),
             }
 
             match key {
@@ -514,7 +516,6 @@ impl Config {
                                      .or_insert(Target::default());
                     let root = parse_configure_path(value);
                     target.llvm_config = Some(push_exe_path(root, &["bin", "llvm-config"]));
-                    target.system_llvm = true;
                 }
                 "CFG_JEMALLOC_ROOT" if value.len() > 0 => {
                     let target = self.target_config.entry(self.build.clone())

src/bootstrap/config.toml.example

@@ -124,6 +124,9 @@
 # disabled by default.
 #extended = false
 
+# Build the sanitizer runtimes
+#sanitizers = false
+
 # =============================================================================
 # General install configuration options
 # =============================================================================

src/bootstrap/lib.rs

@@ -717,10 +717,6 @@ impl Build {
         }
     }
 
-    fn system_llvm(&self, target: &str) -> bool {
-        self.config.target_config.get(target).map(|t| t.system_llvm).unwrap_or(false)
-    }
-
     /// Returns the path to `FileCheck` binary for the specified target
     fn llvm_filecheck(&self, target: &str) -> PathBuf {
         let target_config = self.config.target_config.get(target);

src/librustc_llvm/ffi.rs

@@ -127,7 +127,7 @@ pub enum Attribute {
     ZExt            = 18,
     InReg           = 19,
     SanitizeThread  = 20,
-    SanitizeAddress  = 21,
+    SanitizeAddress = 21,
     SanitizeMemory  = 22,
 }
 

src/test/run-make/sanitizer-address/Makefile

@@ -1,21 +1,11 @@
 -include ../tools.mk
 
 # NOTE the address sanitizer only supports x86_64 linux
-ifndef IS_WINDOWS
-ifeq ($(shell uname),Linux)
-ifeq ($(shell uname -m),x86_64)
+ifdef SANITIZER_SUPPORT
 all:
 	$(RUSTC) -g -Z sanitizer=address -Z print-link-args overflow.rs | grep -q librustc_asan
 	$(TMPDIR)/overflow 2>&1 | grep -q stack-buffer-overflow
 else
 all:
 
 endif
-else
-all:
-
-endif
-else
-all:
-
-endif

src/test/run-make/sanitizer-leak/Makefile

@@ -1,23 +1,10 @@
 -include ../tools.mk
 
-# NOTE the leak sanitizer only supports x86_64 linux
-# Also, this particular sanitizer sometimes doesn't work so we are not going to
-# run the binary
-ifndef IS_WINDOWS
-ifeq ($(shell uname),Linux)
-ifeq ($(shell uname -m),x86_64)
+ifdef SANITIZER_SUPPORT
 all:
 	$(RUSTC) -C opt-level=1 -g -Z sanitizer=leak -Z print-link-args leak.rs | grep -q librustc_lsan
 	$(TMPDIR)/leak 2>&1 | grep -q 'detected memory leaks'
 else
 all:
 
 endif
-else
-all:
-
-endif
-else
-all:
-
-endif

src/test/run-make/sanitizer-memory/Makefile

@@ -1,21 +1,10 @@
 -include ../tools.mk
 
-# NOTE the memory sanitizer only supports x86_64 linux
-ifndef IS_WINDOWS
-ifeq ($(shell uname),Linux)
-ifeq ($(shell uname -m),x86_64)
+ifdef SANITIZER_SUPPORT
 all:
 	$(RUSTC) -g -Z sanitizer=memory -Z print-link-args uninit.rs | grep -q librustc_msan
 	$(TMPDIR)/uninit 2>&1 | grep -q use-of-uninitialized-value
 else
 all:
 
 endif
-else
-all:
-
-endif
-else
-all:
-
-endif

src/test/run-make/sanitizer-thread/Makefile

@@ -1,21 +1,10 @@
 -include ../tools.mk
 
-# NOTE the leak sanitizer only supports x86_64 linux
-ifndef IS_WINDOWS
-ifeq ($(shell uname),Linux)
-ifeq ($(shell uname -m),x86_64)
+ifdef SANITIZER_SUPPORT
 all:
 	$(RUSTC) -g -Z sanitizer=thread -Z print-link-args racy.rs | grep -q librustc_tsan
 	$(TMPDIR)/racy 2>&1 | grep -q 'data race'
 else
 all:
 
 endif
-else
-all:
-
-endif
-else
-all:
-
-endif