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35 # Helper functions for managing more complex options
38 # Creates a string cache variable with multiple choices
41 # gmx_option_multichoice(VAR "Description" DEFAULT_VALUE
42 # Value1 Value2 ... ValueN)
44 # VAR is set in the cache and in the caller's scope. The caller can assume
45 # that it is always one of the provided values, converted to uppercase.
47 # Main benefit is that the list of allowed values only needs to be provided
48 # once, and gets used in multiple contexts:
49 # 1. It is automatically added to the description.
50 # 2. It is set as the STRINGS property of the created cache variable for use
52 # 3. The user-provided value is checked against the list, and a fatal error
53 # is produced if the value is not known. The caller does not need to
54 # produce good error messages in cases where it may be necessary to check
55 # for the validity again.
56 # As a special case, any "[built-in]" string in the allowed values is ignored
57 # when checking the user-provided value, but is added to all user-visible
60 # It appears that ccmake does not use the STRINGS property, but perhaps some
63 function(GMX_OPTION_MULTICHOICE NAME DESCRIPTION DEFAULT)
64 # Some processing of the input values
65 string(REPLACE ";" ", " _allowed_comma_separated "${ARGN}")
66 set(_description "${DESCRIPTION}. Pick one of: ${_allowed_comma_separated}")
67 string(REPLACE "[built-in]" "" _allowed "${ARGN}")
69 # Set the cache properties
70 set(${NAME} ${DEFAULT} CACHE STRING ${_description})
71 set_property(CACHE ${NAME} PROPERTY STRINGS ${_allowed})
73 # Check that the value is one of the allowed
74 set(_org_value "${${NAME}}")
75 string(TOUPPER "${${NAME}}" ${NAME})
76 string(TOUPPER "${_allowed}" _allowed_as_upper)
77 list(FIND _allowed_as_upper "${${NAME}}" _found_index)
78 if (_found_index EQUAL -1)
79 message(FATAL_ERROR "Invalid value for ${NAME}: ${_org_value}. "
80 "Pick one of: ${_allowed_comma_separated}")
82 # Always provide the upper-case value to the caller
83 set(${NAME} "${${NAME}}" PARENT_SCOPE)
86 # Convenience function for reporting a fatal error for an invalid input value
87 function(GMX_INVALID_OPTION_VALUE NAME)
88 message(FATAL_ERROR "Invalid value for ${NAME}: ${${NAME}}")
91 # Hides or shows a cache value based on conditions
94 # gmx_add_cache_dependency(VAR TYPE CONDITIONS VALUE)
96 # VAR is a name of a cached variable
97 # TYPE is the type of VAR
98 # CONDITIONS is a list of conditional expressions (see below)
99 # VALUE is a value that is set to VAR if CONDITIONS is not satisfied
101 # Evaluates each condition in CONDITIONS, and if any of them is false,
102 # VAR is marked internal (hiding it from the user) and its value is set to
103 # VALUE. The previous user-set value of VAR is still remembered in the cache,
104 # and used when CONDITIONS become true again.
106 # The conditions is a semicolon-separated list of conditions as specified for
107 # CMake if() statements, such as "GMX_FFT_LIBRARY STREQUAL FFTW3",
108 # "NOT GMX_MPI" or "GMX_MPI;NOT GMX_DOUBLE". Note that quotes within the
109 # expressions don't work for some reason (even if escaped).
111 # The logic is adapted from cmake_dependent_option().
113 function(GMX_ADD_CACHE_DEPENDENCY NAME TYPE CONDITIONS FORCED_VALUE)
115 foreach(_cond ${CONDITIONS})
116 string(REGEX REPLACE " +" ";" _cond_as_list ${_cond})
117 if (${_cond_as_list})
119 set(_available FALSE)
123 set_property(CACHE ${NAME} PROPERTY TYPE ${TYPE})
125 set(${NAME} "${FORCED_VALUE}" PARENT_SCOPE)
126 set_property(CACHE ${NAME} PROPERTY TYPE INTERNAL)
130 # Works like cmake_dependent_option(), but allows for an arbitrary cache value
131 # instead of only an ON/OFF option
134 # gmx_dependent_cache_variable(VAR "Description" TYPE DEFAULT CONDITIONS)
136 # Creates a cache variable VAR with the given description, type and default
137 # value. If any of the conditions listed in CONDITIONS is not true, then
138 # the cache variable is marked internal (hiding it from the user) and the
139 # value of VAR is set to DEFAULT. The previous user-set value of VAR is still
140 # remembered in the cache, and used when CONDITIONS become true again.
141 # Any further changes to the variable can be done with simple set()
142 # (or set_property(CACHE VAR PROPERTY VALUE ...) if the cache needs to be
145 # See gmx_add_cache_dependency() on how to specify the conditions.
147 macro(GMX_DEPENDENT_CACHE_VARIABLE NAME DESCRIPTION TYPE DEFAULT CONDITIONS)
148 set(${NAME} "${DEFAULT}" CACHE ${TYPE} "${DESCRIPTION}")
149 gmx_add_cache_dependency(${NAME} ${TYPE} "${CONDITIONS}" "${DEFAULT}")
152 # Works like cmake_dependent_option(), but reuses the code from
153 # gmx_dependent_cache_variable() to make sure both behave the same way.
154 macro(GMX_DEPENDENT_OPTION NAME DESCRIPTION DEFAULT CONDITIONS)
155 gmx_dependent_cache_variable(${NAME} "${DESCRIPTION}" BOOL "${DEFAULT}" "${CONDITIONS}")
158 # Checks if one or more cache variables have changed
161 # gmx_check_if_changed(RESULT VAR1 VAR2 ... VARN)
163 # Sets RESULT to true if any of the given cache variables VAR1 ... VARN has
164 # changes since the last call to this function for that variable.
165 # Changes are tracked also across CMake runs.
166 function(GMX_CHECK_IF_CHANGED RESULT)
168 foreach (_var ${ARGN})
169 if (NOT "${${_var}}" STREQUAL "${${_var}_PREVIOUS_VALUE}")
172 set(${_var}_PREVIOUS_VALUE "${${_var}}" CACHE INTERNAL
173 "Previous value of ${_var} for change tracking")
175 set(${RESULT} ${_result} PARENT_SCOPE)