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Check if the CLHEP target exists before creating it #1169

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Sep 15, 2023
Merged

Check if the CLHEP target exists before creating it #1169

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6 changes: 5 additions & 1 deletion cmake/DD4hepBuild.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -826,7 +826,11 @@ MACRO(DD4HEP_SETUP_GEANT4_TARGETS)

if(Geant4_builtin_clhep_FOUND)
dd4hep_debug("Using Geant4 internal CLHEP")
ADD_LIBRARY(CLHEP::CLHEP INTERFACE IMPORTED GLOBAL)
if(TARGET CLHEP::CLHEP)
message(WARNING "CLHEP::CLHEP already exists, this may cause problems if there are two different installations of CLHEP, one from Geant4 and one external")
else()
ADD_LIBRARY(CLHEP::CLHEP INTERFACE IMPORTED GLOBAL)
endif()
SET_TARGET_PROPERTIES(CLHEP::CLHEP
PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${Geant4_INCLUDE_DIRS}"
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