From ae28e68d092d4f2e30a8b177fa45d148f9769cc8 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Mon, 18 Jan 2010 06:48:48 +0000
Subject: [PATCH] Add more make utility functions.  - With tests. :)

llvm-svn: 93716
---
 compiler-rt/make/test/test-util.mk | 59 ++++++++++++++++++++++++++++++
 compiler-rt/make/util.mk           | 57 ++++++++++++++++++++++++++++-
 2 files changed, 114 insertions(+), 2 deletions(-)
 create mode 100644 compiler-rt/make/test/test-util.mk

diff --git a/compiler-rt/make/test/test-util.mk b/compiler-rt/make/test/test-util.mk
new file mode 100644
index 000000000000..13e702a9464f
--- /dev/null
+++ b/compiler-rt/make/test/test-util.mk
@@ -0,0 +1,59 @@
+include make/util.mk
+
+streq_t0 = $(call streq,,)
+$(call AssertEqual,streq_t0,true)
+streq_t1 = $(call streq,b,)
+$(call AssertEqual,streq_t1,)
+streq_t2 = $(call streq,,b)
+$(call AssertEqual,streq_t2,)
+streq_t3 = $(call streq,b,b)
+$(call AssertEqual,streq_t3,true)
+streq_t4 = $(call streq,bb,b)
+$(call AssertEqual,streq_t4,)
+streq_t5 = $(call streq,b,bb)
+$(call AssertEqual,streq_t5,)
+streq_t6 = $(call streq,bb,bb)
+$(call AssertEqual,streq_t6,true)
+
+strneq_t7 = $(call strneq,,)
+$(call AssertEqual,strneq_t7,)
+strneq_t8 = $(call strneq,b,)
+$(call AssertEqual,strneq_t8,true)
+strneq_t9 = $(call strneq,,b)
+$(call AssertEqual,strneq_t9,true)
+strneq_t10 = $(call strneq,b,b)
+$(call AssertEqual,strneq_t10,)
+strneq_t11 = $(call strneq,bb,b)
+$(call AssertEqual,strneq_t11,true)
+strneq_t12 = $(call strneq,b,bb)
+$(call AssertEqual,strneq_t12,true)
+strneq_t13 = $(call strneq,bb,bb)
+$(call AssertEqual,strneq_t13,)
+
+contains_t0 = $(call contains,a b b c,a)
+$(call AssertEqual,contains_t0,true)
+contains_t1 = $(call contains,a b b c,b)
+$(call AssertEqual,contains_t1,true)
+contains_t2 = $(call contains,a b b c,c)
+$(call AssertEqual,contains_t2,true)
+contains_t3 = $(call contains,a b b c,d)
+$(call AssertEqual,contains_t3,)
+
+isdefined_t0_defined_var := 0
+isdefined_t0 = $(call IsDefined,isdefined_t0_defined_var)
+$(call AssertEqual,isdefined_t0,true)
+isdefined_t1 = $(call IsDefined,isdefined_t1_never_defined_var)
+$(call AssertEqual,isdefined_t1,)
+
+varordefault_t0_var := 1
+varordefault_t0 = $(call VarOrDefault,varordefault_t0_var.opt,$(varordefault_t0_var))
+$(call AssertEqual,varordefault_t0,1)
+varordefault_t1_var := 1
+varordefault_t1_var.opt := 2
+varordefault_t1 = $(call VarOrDefault,varordefault_t1_var.opt,$(varordefault_t1_var))
+$(call AssertEqual,varordefault_t1,2)
+
+all:
+	@true
+.PHONY: all
+
diff --git a/compiler-rt/make/util.mk b/compiler-rt/make/util.mk
index 2ce9a46a20cb..6764a91cbd24 100644
--- a/compiler-rt/make/util.mk
+++ b/compiler-rt/make/util.mk
@@ -1,4 +1,4 @@
-# Makefile utilities
+# Generic Makefile Utilities
 
 ###
 # Utility functions
@@ -15,6 +15,19 @@ streq = $(if $(1),$(if $(subst $(1),,$(2))$(subst $(2),,$(1)),,true),$(if $(2),,
 # Return "true" if LHS != RHS, otherwise "".
 strneq = $(if $(call streq,$(1),$(2)),,true)
 
+# Function: contains list item
+#
+# Return "true" if 'list' contains the value 'item'.
+contains = $(if $(strip $(foreach i,$(1),$(if $(call streq,$(2),$(i)),T,))),true,)
+
+# Function: is_subset a b
+# Return "true" if 'a' is a subset of 'b'.
+is_subset = $(if $(strip $(set_difference $(1),$(2))),,true)
+
+# Function: set_difference a b
+# Return a - b.
+set_difference = $(foreach i,$(1),$(if $(call contains,$(2),$(i)),,$(i)))
+
 # Function: Set variable value
 #
 # Set the given make variable to the given value.
@@ -25,6 +38,47 @@ Set = $(eval $(1) := $(2))
 # Append the given value to the given make variable.
 Append = $(eval $(1) += $(2))
 
+# Function: IsDefined variable
+#
+# Check whether the given variable is defined.
+IsDefined = $(call strneq,undefined,$(flavor $(1)))
+
+# Function: IsUndefined variable
+#
+# Check whether the given variable is undefined.
+IsUndefined = $(call streq,undefined,$(flavor $(1)))
+
+# Function: VarOrDefault variable default-value
+#
+# Get the value of the given make variable, or the default-value if the variable
+# is undefined.
+VarOrDefault = $(if $(call IsDefined,$(1)),$($(1)),$(2))
+
+# Function: CheckValue variable
+#
+# Print the name, definition, and value of a variable, for testing make
+# utilities.
+#
+# Example:
+#   foo = $(call streq,a,a)
+#   $(call CheckValue,foo)
+# Example Output:
+#   CHECKVALUE: foo: $(call streq,,) - true
+CheckValue = $(info CHECKVALUE: $(1): $(value $(1)) - $($(1)))
+
+# Function: Assert value message
+#
+# Check that a value is true, or give an error including the given message
+Assert = $(if $(1),,\
+           $(error Assertion failed: $(2)))
+
+# Function: AssertEqual variable expected-value
+#
+# Check that the value of a variable is 'expected-value'.
+AssertEqual = \
+  $(if $(call streq,$($(1)),$(2)),,\
+       $(error Assertion failed: $(1): $(value $(1)) - $($(1)) != $(2)))
+
 ###
 # Clean up make behavior
 
@@ -38,4 +92,3 @@ Append = $(eval $(1) += $(2))
 # and origin of XXX.
 make-print-%:
 	$(error PRINT: $(value $*) = "$($*)" (from $(origin $*)))
-