diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -133,18 +133,25 @@
     ! grep -q '^--- a' ${BUILD_DIR}/clang-format.patch
 ;;
 check-generated-output)
+    # When using set -e in Bash and use the not operator to invert the result
+    # of a command, the failed test won't stop processing. This is solved by
+    # using the logical or operator. This command won't work as intended:
+    # ! foo
+    # Instead use:
+    # ! foo || false
+    # Note if ! foo is the last command it will work as intended.
     clean
     echo "+++ Checking the output of the generator scripts"
     mkdir -p ${BUILD_DIR}
     # Reject patches that introduce non-ASCII characters or hard tabs.
-    ! grep -rn '[^ -~]' libcxx/include/
+    ! grep -rn '[^ -~]' libcxx/include/ || false
     # Reject patches that don't update the generated output correctly.
     python3 libcxx/utils/generate_feature_test_macro_components.py
     python3 libcxx/utils/generate_header_inclusion_tests.py
     python3 libcxx/utils/generate_header_tests.py
     git diff | tee ${BUILD_DIR}/generated_output.patch
     # Check if the diffs are empty, fail otherwise.
-    ! grep -q '^--- a' ${BUILD_DIR}/generated_output.patch
+    ! grep -q '^--- a' ${BUILD_DIR}/generated_output.patch || false
     # Check that no dependency cycles have been introduced.
     python3 libcxx/utils/graph_header_deps.py >/dev/null
 ;;