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ExternalProject: error out only if the property is unset 

Property values may be empty; instead make sure they exist and allow for
empty values.
This commit is contained in:
Ben Boeckel 2016-10-18 12:50:46 -04:00
parent b99bbfe88d
commit fdce782b61
1 changed files with 3 additions and 2 deletions
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5
Modules/ExternalProject.cmake
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@ -1184,10 +1184,11 @@ endfunction()
function(ExternalProject_Get_Property name)
foreach(var ${ARGN})
string(TOUPPER "${var}" VAR)
get_property(${var} TARGET ${name} PROPERTY _EP_${VAR})
if(NOT ${var})
get_property(is_set TARGET ${name} PROPERTY _EP_${VAR} SET)
if(NOT is_set)
message(FATAL_ERROR "External project \"${name}\" has no ${var}")
endif()
get_property(${var} TARGET ${name} PROPERTY _EP_${VAR})
set(${var} "${${var}}" PARENT_SCOPE)
endforeach()
endfunction()