qt5base-lts/mkspecs/features/mac/sdk.mk

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CURRENT_MAC_SDK_VERSION := $(shell DEVELOPER_DIR=$(EXPORT_QMAKE_XCODE_DEVELOPER_PATH) /usr/bin/xcrun --sdk $(EXPORT_QMAKE_MAC_SDK) -show-sdk-version)
ifneq ($(CURRENT_MAC_SDK_VERSION),$(EXPORT_QMAKE_MAC_SDK_VERSION))
$(info The platform SDK has been changed from version $(EXPORT_QMAKE_MAC_SDK_VERSION) to version $(CURRENT_MAC_SDK_VERSION).)
$(info This requires a fresh build. Please wipe the build directory completely,)
$(info including any .qmake.stash and .qmake.cache files generated by qmake.)
# FIXME: Ideally this should be advertised as just running make distclean, or we
# should even do it automatically by having proper makefile dependencies between
# .qmake.stash and the SDK version, but as qmake doesn't seem to be consistent in
# how it deals with .qmake.stash as a dependency we need to defer that until later.
$(error ^)
endif