Remove empty rules for check_elf_files.timestamp
If we don't have any new dependencies, or we never set up the
check_elf_files.timestamp rule, don't create an empty one now.
There were >7000 of these unused and empty rules in my AOSP
aosp_cf_x86_phone build.
This was initially brought to my attention by the new checks in
https://github.com/google/kati/pull/189
Test: diff out/build-aosp_cf_x86_phone.ninja, only removed phony rules
Change-Id: Ia43cbbd04df4a01d2182b14e3ccbe5d5ecbcabad
diff --git a/core/check_elf_file.mk b/core/check_elf_file.mk
index da4168d..d54a5b7 100644
--- a/core/check_elf_file.mk
+++ b/core/check_elf_file.mk
@@ -38,6 +38,8 @@
$<
$(hide) touch $@
+CHECK_ELF_FILES.$(check_elf_files_stamp) := 1
+
ifneq ($(strip $(LOCAL_CHECK_ELF_FILES)),false)
ifneq ($(strip $(BUILD_BROKEN_PREBUILT_ELF_FILES)),true)
$(LOCAL_BUILT_MODULE): $(check_elf_files_stamp)