Modify a local mongodbtoolchain installation to break behavior. In this case, Drew's toolchain contained a patched binutils. I was able to reproduce the bug by running $ rm -rf build // from mongo root $PY buildscripts/scons.py -j8 \       --link-model=dynamic \       --modules=“” \       --variables-files= --variables-files=./etc/scons/mongodbtoolchain_stable_gcc.vars  \       ICECC=icecc CCACHE= \       build/opt/third_party/libshim_unwind.so The error manifests as mkdir -p /home/eric/repos/mongo/build/scons/icecc && ICECC_VERSION_TMP=$(/usr/bin/icecc-create-env --gcc /opt/mongodbtoolchain/v3/bin/gcc /opt/mongodbtoolchain/v3/bin/g++ | awk '/^creating .*\.tar\.gz/ { print $2 }' ) && mv $ICECC_VERSION_TMP build/scons/icecc/opt_mongodbtoolchain_v3_bin_gcc_opt_mongodbtoolchain_v3_bin_g++.tar.gz Compiling build/opt/third_party/shim_unwind.dyn.o Linking build/opt/third_party/libshim_unwind.so /opt/mongodbtoolchain/revisions/91aa820a4e15ec424e214cdc861c1f4aa575a72c/stow/gcc-v3.fox/lib/gcc/x86_64-mongodb-linux/8.2.0/../../../../x86_64-mongodb-linux/bin/ld.gold: warning: build/opt/third_party/shim_unwind.dyn.o: section .debug_str contains incorrectly aligned strings; the alignment of those strings won't be preserved /opt/mongodbtoolchain/revisions/91aa820a4e15ec424e214cdc861c1f4aa575a72c/stow/gcc-v3.fox/lib/gcc/x86_64-mongodb-linux/8.2.0/../../../../x86_64-mongodb-linux/bin/ld.gold: error: treating warnings as errors collect2: error: ld returned 1 exit status scons: *** [build/opt/third_party/libshim_unwind.so] Error 1 scons: building terminated because of errors. build/opt/third_party/libshim_unwind.so failed: Error 1