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# Defines a target named ${target} and a command with (symbolic) output
# ${target}-cmd. If ${prg} is undefined the target prints "not found".
#
# - Use add_custom_command(…APPEND) to build the command after this.
# - Use add_custom_target(…DEPENDS) to run the command from a target.
function(def_cmd_target target prg prg_name prg_fatal)
# Define a mostly-empty command, which can be appended-to.
add_custom_command(OUTPUT ${target}-cmd
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
COMMAND ${CMAKE_COMMAND} -E echo "${target}"
)
# Symbolic (does not generate an artifact).
set_source_files_properties(${target}-cmd PROPERTIES SYMBOLIC "true")
if(prg OR NOT prg_fatal)
add_custom_target(${target}
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
DEPENDS ${target}-cmd)
if(NOT prg)
add_custom_command(OUTPUT ${target}-cmd APPEND
COMMAND ${CMAKE_COMMAND} -E echo "${target}: SKIP: ${prg_name} not found")
endif()
else()
add_custom_target(${target} false
COMMENT "${target}: ${prg_name} not found")
endif()
endfunction()
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