Fix kati regen due to build_number.txt
Do NOT touch build_number.txt if BUILD_NUMBER is explicitly set
but not changed from last build.
Bug: 182221512
Test: BUILD_NUMBER=123 m nothing
Change-Id: Ic88f6e0d2b9767d84e1ec5c826018d1ea08c0fc0
diff --git a/core/main.mk b/core/main.mk
index efa6031..2291740 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -41,7 +41,12 @@
# without changing the command line every time. Avoids rebuilds
# when using ninja.
$(shell mkdir -p $(SOONG_OUT_DIR) && \
- echo -n $(BUILD_NUMBER) > $(SOONG_OUT_DIR)/build_number.txt)
+ echo -n $(BUILD_NUMBER) > $(SOONG_OUT_DIR)/build_number.tmp; \
+ if ! cmp -s $(SOONG_OUT_DIR)/build_number.tmp $(SOONG_OUT_DIR)/build_number.txt; then \
+ mv $(SOONG_OUT_DIR)/build_number.tmp $(SOONG_OUT_DIR)/build_number.txt; \
+ else \
+ rm $(SOONG_OUT_DIR)/build_number.tmp; \
+ fi)
BUILD_NUMBER_FILE := $(SOONG_OUT_DIR)/build_number.txt
.KATI_READONLY := BUILD_NUMBER_FILE
$(KATI_obsolete_var BUILD_NUMBER,See https://android.googlesource.com/platform/build/+/master/Changes.md#BUILD_NUMBER)