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36 # Helper functions for managing more complex options
39 # Creates a string cache variable with multiple choices
42 # gmx_option_multichoice(VAR "Description" DEFAULT_VALUE
43 # Value1 Value2 ... ValueN)
45 # VAR is set in the cache and in the caller's scope. The caller can assume
46 # that it is always one of the provided values, converted to uppercase.
48 # Main benefit is that the list of allowed values only needs to be provided
49 # once, and gets used in multiple contexts:
50 # 1. It is automatically added to the description.
51 # 2. It is set as the STRINGS property of the created cache variable for use
53 # 3. The user-provided value is checked against the list, and a fatal error
54 # is produced if the value is not known. The caller does not need to
55 # produce good error messages in cases where it may be necessary to check
56 # for the validity again.
57 # As a special case, any "[built-in]" string in the allowed values is ignored
58 # when checking the user-provided value, but is added to all user-visible
61 # It appears that ccmake does not use the STRINGS property, but perhaps some
64 function(GMX_OPTION_MULTICHOICE NAME DESCRIPTION DEFAULT)
65 # Some processing of the input values
66 string(REPLACE ";" ", " _allowed_comma_separated "${ARGN}")
67 set(_description "${DESCRIPTION}. Pick one of: ${_allowed_comma_separated}")
68 string(REPLACE "[built-in]" "" _allowed "${ARGN}")
70 # Set the cache properties
71 set(${NAME} ${DEFAULT} CACHE STRING ${_description})
72 set_property(CACHE ${NAME} PROPERTY STRINGS ${_allowed})
74 # Check that the value is one of the allowed
75 set(_org_value "${${NAME}}")
76 string(TOUPPER "${${NAME}}" ${NAME})
77 string(TOUPPER "${_allowed}" _allowed_as_upper)
78 list(FIND _allowed_as_upper "${${NAME}}" _found_index)
79 if (_found_index EQUAL -1)
80 message(FATAL_ERROR "Invalid value for ${NAME}: ${_org_value}. "
81 "Pick one of: ${_allowed_comma_separated}")
83 # Always provide the upper-case value to the caller
84 set(${NAME} "${${NAME}}" PARENT_SCOPE)
87 # Convenience function for reporting a fatal error for an invalid input value
88 function(GMX_INVALID_OPTION_VALUE NAME)
89 message(FATAL_ERROR "Invalid value for ${NAME}: ${${NAME}}")