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-rw-r--r--Makefile.in3
-rw-r--r--src/libstd/macros.rs6
-rw-r--r--src/libstd/rt/util.rs3
3 files changed, 9 insertions, 3 deletions
diff --git a/Makefile.in b/Makefile.in
index a9a41a073d0..0575f48c4c4 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -96,7 +96,8 @@ ifdef CFG_DISABLE_OPTIMIZE
   $(info cfg: disabling rustc optimization (CFG_DISABLE_OPTIMIZE))
   CFG_RUSTC_FLAGS +=
 else
-  CFG_RUSTC_FLAGS += -O
+  # The rtopt cfg turns off runtime sanity checks
+  CFG_RUSTC_FLAGS += -O --cfg rtopt
 endif
 
 ifdef CFG_ENABLE_DEBUG
diff --git a/src/libstd/macros.rs b/src/libstd/macros.rs
index 600d0bb133e..5378a2c798d 100644
--- a/src/libstd/macros.rs
+++ b/src/libstd/macros.rs
@@ -27,8 +27,10 @@ macro_rules! rtdebug (
 
 macro_rules! rtassert (
     ( $arg:expr ) => ( {
-        if !$arg {
-            rtabort!("assertion failed: %s", stringify!($arg));
+        if ::rt::util::ENFORCE_SANITY {
+            if !$arg {
+                rtabort!("assertion failed: %s", stringify!($arg));
+            }
         }
     } )
 )
diff --git a/src/libstd/rt/util.rs b/src/libstd/rt/util.rs
index f2ede8872c2..c3f5b11a930 100644
--- a/src/libstd/rt/util.rs
+++ b/src/libstd/rt/util.rs
@@ -19,6 +19,9 @@ use unstable::atomics::{AtomicInt, INIT_ATOMIC_INT, SeqCst};
 #[cfg(target_os="macos")]
 use unstable::running_on_valgrind;
 
+// Indicates whether we should perform expensive sanity checks, including rtassert!
+pub static ENFORCE_SANITY: bool = !cfg!(rtopt) || cfg!(rtdebug) || cfg!(rtassert);
+
 /// Get the number of cores available
 pub fn num_cpus() -> uint {
     #[fixed_stack_segment]; #[inline(never)];