diff --git a/core/config.mk b/core/config.mk
index 4e785bc..f5e0aa6 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -79,6 +79,10 @@
 # Some specific paths to tools
 SRC_DROIDDOC_DIR := $(TOPDIR)build/tools/droiddoc
 
+# Set up efficient math functions which are used in make.
+# Here since this file is included by envsetup as well as during build.
+include $(BUILD_SYSTEM)/math.mk
+
 # Various mappings to avoid hard-coding paths all over the place
 include $(BUILD_SYSTEM)/pathmap.mk
 
diff --git a/core/definitions.mk b/core/definitions.mk
index eb69341..15ef6f4 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -3159,68 +3159,6 @@
 endef
 
 ###########################################################
-# Basic math functions for positive integers <= 100
-#
-# (SDK versions for example)
-###########################################################
-__MATH_NUMBERS :=  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 \
-                  21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 \
-                  41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 \
-                  61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 \
-                  81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
-
-# Returns true if $(1) is a positive integer <= 100, otherwise returns nothing.
-define math_is_number
-$(strip \
-  $(if $(1),,$(error Argument missing)) \
-  $(if $(word 2,$(1)),$(error Multiple words in a single argument: $(1))) \
-  $(if $(filter $(1),$(__MATH_NUMBERS)),true))
-endef
-
-#$(warning true == $(call math_is_number,2))
-#$(warning == $(call math_is_number,foo))
-#$(call math_is_number,1 2)
-#$(call math_is_number,no 2)
-
-define _math_check_valid
-$(if $(call math_is_number,$(1)),,$(error Only positive integers <= 100 are supported (not $(1))))
-endef
-
-#$(call _math_check_valid,0)
-#$(call _math_check_valid,1)
-#$(call _math_check_valid,100)
-#$(call _math_check_valid,101)
-#$(call _math_check_valid,)
-#$(call _math_check_valid,1 2)
-
-# Returns the greater of $1 or $2.
-# If $1 or $2 is not a positive integer <= 100, then an error is generated.
-define math_max
-$(strip $(call _math_check_valid,$(1)) $(call _math_check_valid,$(2)) \
-  $(lastword $(filter $(1) $(2),$(__MATH_NUMBERS))))
-endef
-
-#$(call math_max)
-#$(call math_max,1)
-#$(call math_max,1 2,3)
-#$(warning 1 == $(call math_max,1,1))
-#$(warning 42 == $(call math_max,5,42))
-#$(warning 42 == $(call math_max,42,5))
-
-define math_gt_or_eq
-$(if $(filter $(1),$(call math_max,$(1),$(2))),true)
-endef
-
-#$(warning $(call math_gt_or_eq, 2, 1))
-#$(warning $(call math_gt_or_eq, 1, 1))
-#$(warning $(if $(call math_gt_or_eq, 1, 2),false,true))
-
-# $1 is the variable name to increment
-define inc_and_print
-$(strip $(eval $(1) := $($(1)) .)$(words $($(1))))
-endef
-
-###########################################################
 ## Compatibility suite tools
 ###########################################################
 
diff --git a/core/math.mk b/core/math.mk
new file mode 100644
index 0000000..047d046
--- /dev/null
+++ b/core/math.mk
@@ -0,0 +1,77 @@
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+###########################################################
+# Basic math functions for positive integers <= 100
+#
+# (SDK versions for example)
+###########################################################
+__MATH_NUMBERS :=  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 \
+                  21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 \
+                  41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 \
+                  61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 \
+                  81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
+
+# Returns true if $(1) is a positive integer <= 100, otherwise returns nothing.
+define math_is_number
+$(strip \
+  $(if $(1),,$(error Argument missing)) \
+  $(if $(word 2,$(1)),$(error Multiple words in a single argument: $(1))) \
+  $(if $(filter $(1),$(__MATH_NUMBERS)),true))
+endef
+
+#$(warning true == $(call math_is_number,2))
+#$(warning == $(call math_is_number,foo))
+#$(call math_is_number,1 2)
+#$(call math_is_number,no 2)
+
+define _math_check_valid
+$(if $(call math_is_number,$(1)),,$(error Only positive integers <= 100 are supported (not $(1))))
+endef
+
+#$(call _math_check_valid,0)
+#$(call _math_check_valid,1)
+#$(call _math_check_valid,100)
+#$(call _math_check_valid,101)
+#$(call _math_check_valid,)
+#$(call _math_check_valid,1 2)
+
+# Returns the greater of $1 or $2.
+# If $1 or $2 is not a positive integer <= 100, then an error is generated.
+define math_max
+$(strip $(call _math_check_valid,$(1)) $(call _math_check_valid,$(2)) \
+  $(lastword $(filter $(1) $(2),$(__MATH_NUMBERS))))
+endef
+
+#$(call math_max)
+#$(call math_max,1)
+#$(call math_max,1 2,3)
+#$(warning 1 == $(call math_max,1,1))
+#$(warning 42 == $(call math_max,5,42))
+#$(warning 42 == $(call math_max,42,5))
+
+define math_gt_or_eq
+$(if $(filter $(1),$(call math_max,$(1),$(2))),true)
+endef
+
+#$(warning $(call math_gt_or_eq, 2, 1))
+#$(warning $(call math_gt_or_eq, 1, 1))
+#$(warning $(if $(call math_gt_or_eq, 1, 2),false,true))
+
+# $1 is the variable name to increment
+define inc_and_print
+$(strip $(eval $(1) := $($(1)) .)$(words $($(1))))
+endef