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# TargetRequire_Check(NAME t1 t2 t3 ...)
#
# TargetRequire_Check(NAME ...) sets "NAME" as TRUE if all the required targets are
# available, and FALSE otherwise.
function(TargetRequire_Check VARNAME)
set(${VARNAME} TRUE PARENT_SCOPE)
foreach(REQUIRED_TARGET IN ITEMS ${ARGN})
if(NOT TARGET ${REQUIRED_TARGET})
set(${VARNAME} FALSE PARENT_SCOPE)
return()
endif(NOT TARGET ${REQUIRED_TARGET})
endforeach(REQUIRED_TARGET)
endfunction(TargetRequire_Check)
# TargetRequire_Assert(t1 t2 t3 ...)
#
# TargetRequire_Assert(...) stops CMake immediately if there is a target required but unavailable.
function(TargetRequire_Assert)
unset(MISSING_TARGETS)
foreach(REQUIRED_TARGET IN ITEMS ${ARGN})
if(NOT TARGET ${REQUIRED_TARGET})
list(APPEND MISSING_TARGETS ${REQUIRED_TARGET})
endif(NOT TARGET ${REQUIRED_TARGET})
endforeach(REQUIRED_TARGET)
list(LENGTH MISSING_TARGETS MISSING_COUNT)
if(NOT MISSING_COUNT EQUAL 0)
message(FATAL_ERROR "${MISSING_TARGETS} are required, but unavailable")
endif(NOT MISSING_COUNT EQUAL 0)
endfunction(TargetRequire_Assert)
# TargetRequire_Return(t1 t2 t3 ...)
#
# TargetRequire_Return(...) returns immediately if there is a target required but unavailable.
#
# NOTE "macro" is inevitable to make "return" inside affect the caller.
macro(TargetRequire_Return)
foreach(REQUIRED_TARGET IN ITEMS ${ARGN})
if(NOT TARGET ${REQUIRED_TARGET})
return()
endif(NOT TARGET ${REQUIRED_TARGET})
endforeach(REQUIRED_TARGET)
endmacro(TargetRequire_Return)
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