Don't check build tools versions (including javac) every time make is run.
This trims off another 1/3 of a second from incremental build times.
VERSION_CHECK_SEQUENCE_NUMBER can be incremented to force a check.
diff --git a/core/main.mk b/core/main.mk
index c3f1e2f..482fefd 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -54,6 +54,12 @@
# be generated correctly
include $(BUILD_SYSTEM)/cleanbuild.mk
+VERSION_CHECK_SEQUENCE_NUMBER := 1
+-include $(OUT_DIR)/versions_checked.mk
+ifneq ($(VERSION_CHECK_SEQUENCE_NUMBER),$(VERSIONS_CHECKED))
+
+$(info Checking build tools versions...)
+
ifneq ($(HOST_OS),windows)
ifneq ($(HOST_OS)-$(HOST_ARCH),darwin-ppc)
# check for a case sensitive file system
@@ -123,6 +129,10 @@
endif # windows
+$(shell echo 'VERSIONS_CHECKED := $(VERSION_CHECK_SEQUENCE_NUMBER)' \
+ > $(OUT_DIR)/versions_checked.mk)
+endif
+
# These are the modifier targets that don't do anything themselves, but
# change the behavior of the build.
# (must be defined before including definitions.make)