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# PackageMultipass - this module defines two macros
#
# FIND_PACKAGE_MULTIPASS (Name CURRENT
# STATES VAR0 VAR1 ...
# DEPENDENTS DEP0 DEP1 ...)
#
# This function creates a cache entry <UPPERCASED-Name>_CURRENT which
# the user can set to "NO" to trigger a reconfiguration of the package.
# The first time this function is called, the values of
# <UPPERCASED-Name>_VAR0, ... are saved. If <UPPERCASED-Name>_CURRENT
# is false or if any STATE has changed since the last time
# FIND_PACKAGE_MULTIPASS() was called, then CURRENT will be set to "NO",
# otherwise CURRENT will be "YES". IF not CURRENT, then
# <UPPERCASED-Name>_DEP0, ... will be FORCED to NOTFOUND.
# Example:
# find_path (FOO_DIR include/foo.h)
# FIND_PACKAGE_MULTIPASS (Foo foo_current
# STATES DIR
# DEPENDENTS INCLUDES LIBRARIES)
# if (NOT foo_current)
# # Make temporary files, run programs, etc, to determine FOO_INCLUDES and FOO_LIBRARIES
# endif (NOT foo_current)
#
# MULTIPASS_C_SOURCE_RUNS (Name INCLUDES LIBRARIES SOURCE RUNS)
# Always runs the given test, use this when you need to re-run tests
# because parent variables have made old cache entries stale.
macro (FIND_PACKAGE_MULTIPASS _name _current)
string (TOUPPER ${_name} _NAME)
set (_args ${ARGV})
list (REMOVE_AT _args 0 1)
set (_states_current "YES")
list (GET _args 0 _cmd)
if (_cmd STREQUAL "STATES")
list (REMOVE_AT _args 0)
list (GET _args 0 _state)
while (_state AND NOT _state STREQUAL "DEPENDENTS")
# The name of the stored value for the given state
set (_stored_var PACKAGE_MULTIPASS_${_NAME}_${_state})
if (NOT "${${_stored_var}}" STREQUAL "${${_NAME}_${_state}}")
set (_states_current "NO")
endif (NOT "${${_stored_var}}" STREQUAL "${${_NAME}_${_state}}")
set (${_stored_var} "${${_NAME}_${_state}}" CACHE INTERNAL "Stored state for ${_name}." FORCE)
list (REMOVE_AT _args 0)
list (GET _args 0 _state)
endwhile (_state AND NOT _state STREQUAL "DEPENDENTS")
endif (_cmd STREQUAL "STATES")
set (_stored ${_NAME}_CURRENT)
if (NOT ${_stored})
set (${_stored} "YES" CACHE BOOL "Is the configuration for ${_name} current? Set to \"NO\" to reconfigure." FORCE)
set (_states_current "NO")
endif (NOT ${_stored})
set (${_current} ${_states_current})
if (NOT ${_current})
message (STATUS "Clearing ${_name} dependent variables")
# Clear all the dependent variables so that the module can reset them
list (GET _args 0 _cmd)
if (_cmd STREQUAL "DEPENDENTS")
list (REMOVE_AT _args 0)
foreach (dep ${_args})
set (${_NAME}_${dep} "NOTFOUND" CACHE INTERNAL "Cleared" FORCE)
endforeach (dep)
endif (_cmd STREQUAL "DEPENDENTS")
set (${_NAME}_FOUND "NOTFOUND" CACHE INTERNAL "Cleared" FORCE)
endif (NOT ${_current})
endmacro (FIND_PACKAGE_MULTIPASS)
macro (MULTIPASS_C_SOURCE_RUNS name includes libraries source runs)
include (CheckCSourceRuns)
string (TOUPPER ${name} _NAME)
# This is a ridiculous hack. CHECK_C_SOURCE_* thinks that if the
# *name* of the return variable doesn't change, then the test does
# not need to be re-run. We keep an internal count which we
# increment to guarantee that every test name is unique. If we've
# gotten here, then the configuration has changed enough that the
# test *needs* to be rerun.
if (NOT MULTIPASS_TEST_COUNT)
set (MULTIPASS_TEST_COUNT 00)
endif (NOT MULTIPASS_TEST_COUNT)
math (EXPR _tmp "${MULTIPASS_TEST_COUNT} + 1") # Why can't I add to a cache variable?
set (MULTIPASS_TEST_COUNT ${_tmp} CACHE INTERNAL "Unique test ID")
set (testname MULTIPASS_TEST_${MULTIPASS_TEST_COUNT}_${runs})
set (CMAKE_REQUIRED_INCLUDES ${includes})
set (CMAKE_REQUIRED_LIBRARIES ${libraries})
check_c_source_runs ("${source}" ${testname})
set (${runs} "${${testname}}")
endmacro (MULTIPASS_C_SOURCE_RUNS)
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