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-rw-r--r--src/ci/docker/wasm32-unknown/Dockerfile6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/ci/docker/wasm32-unknown/Dockerfile b/src/ci/docker/wasm32-unknown/Dockerfile
index 853923ad947..56eda548071 100644
--- a/src/ci/docker/wasm32-unknown/Dockerfile
+++ b/src/ci/docker/wasm32-unknown/Dockerfile
@@ -25,6 +25,12 @@ ENV RUST_CONFIGURE_ARGS \
   --set build.nodejs=/node-v9.2.0-linux-x64/bin/node \
   --set rust.lld
 
+# Some run-make tests have assertions about code size, and enabling debug
+# assertions in libstd causes the binary to be much bigger than it would
+# otherwise normally be. We already test libstd with debug assertions in lots of
+# other contexts as well
+ENV NO_DEBUG_ASSERTIONS=1
+
 ENV SCRIPT python2.7 /checkout/x.py test --target $TARGETS \
   src/test/run-make \
   src/test/ui \