Add min and max supported versions
Add MIN_PLATFORM_VERSION and MAX_PLATFORM_VERSION to track
the range of releases that are expected to be released from
the current branch.
Also simplify version_defaults.mk by moving most of the code
to envsetup.mk.
Test: build/make/tests/envsetup_tests.sh
Change-Id: I4f19c31c267e202f8f5ba1384a8b4385d725f9d7
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 199fe9b..867ba1d 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -11,9 +11,65 @@
# This can be useful if you set OUT_DIR to be a different directory
# than other outputs of your build system.
+# Returns all words in $1 up to and including $2
+define find_and_earlier
+ $(strip $(if $(1),
+ $(firstword $(1))
+ $(if $(filter $(firstword $(1)),$(2)),,
+ $(call find_and_earlier,$(wordlist 2,$(words $(1)),$(1)),$(2)))))
+endef
+
+#$(warning $(call find_and_earlier,A B C,A))
+#$(warning $(call find_and_earlier,A B C,B))
+#$(warning $(call find_and_earlier,A B C,C))
+#$(warning $(call find_and_earlier,A B C,D))
+
+define version-list
+$(1)PR1 $(1)PD1 $(1)PD2 $(1)PM1 $(1)PM2
+endef
+
+ALL_VERSIONS := O P Q R S T U V W X Y Z
+ALL_VERSIONS := $(foreach v,$(ALL_VERSIONS),$(call version-list,$(v)))
+
+# Filters ALL_VERSIONS down to the range [$1, $2], and errors if $1 > $2 or $3 is
+# not in [$1, $2]
+# $(1): min platform version
+# $(2): max platform version
+# $(3): default platform version
+define allowed-platform-versions
+$(strip \
+ $(if $(filter $(ALL_VERSIONS),$(1)),,
+ $(error Invalid MIN_PLATFORM_VERSION '$(1)'))
+ $(if $(filter $(ALL_VERSIONS),$(2)),,
+ $(error Invalid MAX_PLATFORM_VERSION '$(2)'))
+ $(if $(filter $(ALL_VERSIONS),$(3)),,
+ $(error Invalid DEFAULT_PLATFORM_VERSION '$(3)'))
+
+ $(eval allowed_versions_ := $(call find_and_earlier,$(ALL_VERSIONS),$(2)))
+
+ $(if $(filter $(allowed_versions_),$(1)),,
+ $(error MIN_PLATFORM_VERSION '$(1)' must be before MAX_PLATFORM_VERSION '$(2)'))
+
+ $(eval allowed_versions_ := $(1) \
+ $(filter-out $(call find_and_earlier,$(allowed_versions_),$(1)),$(allowed_versions_)))
+
+ $(if $(filter $(allowed_versions_),$(3)),,
+ $(error DEFAULT_PLATFORM_VERSION '$(3)' must be between MIN_PLATFORM_VERSION '$(1)' and MAX_PLATFORM_VERSION '$(2)'))
+
+ $(allowed_versions_))
+endef
+
+#$(warning $(call allowed-platform-versions,OPR1,PPR1,OPR1))
+#$(warning $(call allowed-platform-versions,OPM1,PPR1,OPR1))
+
# Set up version information.
include $(BUILD_SYSTEM)/version_defaults.mk
+ENABLED_VERSIONS := $(call find_and_earlier,$(ALL_VERSIONS),$(TARGET_PLATFORM_VERSION))
+
+$(foreach v,$(ENABLED_VERSIONS), \
+ $(eval IS_AT_LEAST_$(v) := true))
+
# ---------------------------------------------------------------
# If you update the build system such that the environment setup
# or buildspec.mk need to be updated, increment this number, and