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# This file contains a generic workaround to cause a list generated by
# a generator expression to be expanded when used as the COMMAND to
# add_custom_command() or add_custom_target().
# Using this workaround:
# - include this file in CMakeLists.txt
# - call expandable_command(<retvar> <command> [arg1] [arg2] ...)
# - use the <retvar> from above as the COMMAND to add_custom_target()
# or add_custom_command().
# Example to execute
# echo a generated list
# code:
# include(/path/to/expand_command.cmake)
# expandable_command(cmdline echo $<TARGET_PROPERTY:echo,MSGLIST>)
# add_custom_target(echo ALL COMMAND ${cmdline} VERBATIM)
# set_property(TARGET echo PROPERTY MSGLIST a generated list)
if(NOT EXPAND_COMMAND_AS_SCRIPT)
#==== This section is processed at configuration time when included
if(COMMAND expandable_command)
return()
endif()
set(EXPAND_COMMAND_SCRIPT "${CMAKE_CURRENT_LIST_FILE}")
# Check if we are a case like VecGeom + VecCore where CUDA is
# initialized by a sub-project (VecCore) but is used also in the
# top project (VecGeom)
get_directory_property(hasParent PARENT_DIRECTORY)
if(hasParent)
set(EXPAND_COMMAND_SCRIPT "${CMAKE_CURRENT_LIST_FILE}" PARENT_SCOPE)
endif()
function(expandable_command retvar)
set(cmdline ${ARGN})
string(REPLACE ";" "$<SEMICOLON>" cmdline "${cmdline}")
set(${retvar} "${CMAKE_COMMAND}" "-D" "EXPAND_COMMAND_AS_SCRIPT=TRUE"
"-D" "EXPAND_COMMAND=${cmdline}" "-P" "${EXPAND_COMMAND_SCRIPT}"
PARENT_SCOPE)
endfunction(expandable_command)
else()
#==== This section is the command wrapper run at build time
FOREACH(VAL ${EXPAND_COMMAND})
STRING(REGEX REPLACE "^\"(.*)\"$" "\\1" VAL2 ${VAL})
STRING(REGEX REPLACE "^,\"(.*)\"$" ",\\1" VAL3 ${VAL2})
STRING(REGEX REPLACE "\",\"" "," VAL4 ${VAL3})
LIST(APPEND real_cmd "${VAL4}")
ENDFOREACH(VAL ${EXPAND_COMMAND})
execute_process(COMMAND ${real_cmd}
ERROR_VARIABLE error
RESULT_VARIABLE result)
set(stderr_type "")
if(result)
set(stderr_type FATAL_ERROR)
endif()
if(result OR error)
message(${stderr_type} "${error}")
endif()
endif()
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