Merge "Unset BUILD_NUMBER in build_test.bash"
diff --git a/build_test.bash b/build_test.bash
index 4c43224..ee979e7 100755
--- a/build_test.bash
+++ b/build_test.bash
@@ -27,6 +27,10 @@
# that's detected in the Go code, which skips calculating the startup time.
export TRACE_BEGIN_SOONG=$(date +%s%N)
+# Remove BUILD_NUMBER so that incremental builds on build servers don't
+# re-read makefiles every time.
+unset BUILD_NUMBER
+
export TOP=$(cd $(dirname ${BASH_SOURCE[0]})/../..; PWD= /bin/pwd)
cd "${TOP}"
source "${TOP}/build/soong/scripts/microfactory.bash"