Daniel Dunbar | 6260e4a | 2010-01-18 06:48:48 +0000 | [diff] [blame] | 1 | # Generic Makefile Utilities |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 2 | |
| 3 | ### |
| 4 | # Utility functions |
| 5 | |
Daniel Dunbar | faf0150 | 2010-01-18 06:48:33 +0000 | [diff] [blame] | 6 | # Function: streq LHS RHS |
| 7 | # |
| 8 | # Return "true" if LHS == RHS, otherwise "". |
| 9 | # |
| 10 | # LHS == RHS <=> (LHS subst RHS is empty) and (RHS subst LHS is empty) |
| 11 | streq = $(if $(1),$(if $(subst $(1),,$(2))$(subst $(2),,$(1)),,true),$(if $(2),,true)) |
| 12 | |
| 13 | # Function: strneq LHS RHS |
| 14 | # |
| 15 | # Return "true" if LHS != RHS, otherwise "". |
| 16 | strneq = $(if $(call streq,$(1),$(2)),,true) |
| 17 | |
Daniel Dunbar | 6260e4a | 2010-01-18 06:48:48 +0000 | [diff] [blame] | 18 | # Function: contains list item |
| 19 | # |
| 20 | # Return "true" if 'list' contains the value 'item'. |
| 21 | contains = $(if $(strip $(foreach i,$(1),$(if $(call streq,$(2),$(i)),T,))),true,) |
| 22 | |
| 23 | # Function: is_subset a b |
| 24 | # Return "true" if 'a' is a subset of 'b'. |
| 25 | is_subset = $(if $(strip $(set_difference $(1),$(2))),,true) |
| 26 | |
| 27 | # Function: set_difference a b |
| 28 | # Return a - b. |
| 29 | set_difference = $(foreach i,$(1),$(if $(call contains,$(2),$(i)),,$(i))) |
| 30 | |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 31 | # Function: Set variable value |
| 32 | # |
| 33 | # Set the given make variable to the given value. |
| 34 | Set = $(eval $(1) := $(2)) |
| 35 | |
| 36 | # Function: Append variable value |
| 37 | # |
| 38 | # Append the given value to the given make variable. |
| 39 | Append = $(eval $(1) += $(2)) |
| 40 | |
Daniel Dunbar | 6260e4a | 2010-01-18 06:48:48 +0000 | [diff] [blame] | 41 | # Function: IsDefined variable |
| 42 | # |
| 43 | # Check whether the given variable is defined. |
| 44 | IsDefined = $(call strneq,undefined,$(flavor $(1))) |
| 45 | |
| 46 | # Function: IsUndefined variable |
| 47 | # |
| 48 | # Check whether the given variable is undefined. |
| 49 | IsUndefined = $(call streq,undefined,$(flavor $(1))) |
| 50 | |
| 51 | # Function: VarOrDefault variable default-value |
| 52 | # |
| 53 | # Get the value of the given make variable, or the default-value if the variable |
| 54 | # is undefined. |
| 55 | VarOrDefault = $(if $(call IsDefined,$(1)),$($(1)),$(2)) |
| 56 | |
| 57 | # Function: CheckValue variable |
| 58 | # |
| 59 | # Print the name, definition, and value of a variable, for testing make |
| 60 | # utilities. |
| 61 | # |
| 62 | # Example: |
| 63 | # foo = $(call streq,a,a) |
| 64 | # $(call CheckValue,foo) |
| 65 | # Example Output: |
| 66 | # CHECKVALUE: foo: $(call streq,,) - true |
| 67 | CheckValue = $(info CHECKVALUE: $(1): $(value $(1)) - $($(1))) |
| 68 | |
Daniel Dunbar | 48464e0 | 2010-01-18 06:49:33 +0000 | [diff] [blame^] | 69 | # Function: CopyVariable src dst |
| 70 | # |
| 71 | # Copy the value of the variable 'src' to 'dst', taking care to not define 'dst' |
| 72 | # if 'src' is undefined. The destination variable must be undefined. |
| 73 | CopyVariable = \ |
| 74 | $(call AssertValue,$(call IsUndefined,$(2)),destination is already defined)\ |
| 75 | $(if $(call IsUndefined,$(1)),,\ |
| 76 | $(call Set,$(2),$($(1)))) |
| 77 | |
Daniel Dunbar | 6260e4a | 2010-01-18 06:48:48 +0000 | [diff] [blame] | 78 | # Function: Assert value message |
| 79 | # |
| 80 | # Check that a value is true, or give an error including the given message |
| 81 | Assert = $(if $(1),,\ |
| 82 | $(error Assertion failed: $(2))) |
| 83 | |
| 84 | # Function: AssertEqual variable expected-value |
| 85 | # |
| 86 | # Check that the value of a variable is 'expected-value'. |
| 87 | AssertEqual = \ |
| 88 | $(if $(call streq,$($(1)),$(2)),,\ |
| 89 | $(error Assertion failed: $(1): $(value $(1)) - $($(1)) != $(2))) |
| 90 | |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 91 | ### |
| 92 | # Clean up make behavior |
| 93 | |
| 94 | # Cancel all suffix rules. We don't want no stinking suffix rules. |
| 95 | .SUFFIXES: |
| 96 | |
| 97 | ### |
| 98 | # Debugging |
| 99 | |
Daniel Dunbar | 557a6ea | 2010-01-13 16:13:01 +0000 | [diff] [blame] | 100 | # General debugging rule, use 'make print-XXX' to print the definition, value |
| 101 | # and origin of XXX. |
| 102 | make-print-%: |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 103 | $(error PRINT: $(value $*) = "$($*)" (from $(origin $*))) |