Merge branch 'hepmc3_nightly_fixes_22032021_part_1' into 'master'

Try to fix nightly cmake

See merge request !41811

Generators/MCTester_i/CMakeLists.txt

@@ -13,8 +13,8 @@ if (HEPMC3_USE)
   set( HEPMC_MCTester_INTERFACE_DIR ${HEPMC3_INCLUDE_DIR}/../share/HepMC3/interfaces/mc-tester/include)
   #This is needed for HepMC3 only as the HepMC2 interface compiled in MC-TESTER (with the same warnings) 
   #Should be removed after next MC-TESTER release
-  set_source_files_properties(${HEPMC3_INCLUDE_DIR}/../share/HepMC3/interfaces/mc-tester/src/HepMC3Event.cxx PROPERTIES COMPILE_FLAGS -Wno-ignored-qualifiers -Wno-unused-parameter)
-  set_source_files_properties(${HEPMC3_INCLUDE_DIR}/../share/HepMC3/interfaces/mc-tester/src/HepMC3Particle.cxx PROPERTIES COMPILE_FLAGS -Wno-ignored-qualifiers -Wno-unused-parameter)
+  set_source_files_properties("${HEPMC3_INCLUDE_DIR}/../share/HepMC3/interfaces/mc-tester/src/HepMC3Event.cxx" PROPERTIES COMPILE_FLAGS "-Wno-ignored-qualifiers -Wno-unused-parameter")
+  set_source_files_properties("${HEPMC3_INCLUDE_DIR}/../share/HepMC3/interfaces/mc-tester/src/HepMC3Particle.cxx" PROPERTIES COMPILE_FLAGS "-Wno-ignored-qualifiers -Wno-unused-parameter")
 else()
   set( MCTester_sources src/MCTesterAlg.cxx)
   set( HEPMC_MCTester_INTERFACE_DIR ${MCTESTER_INCLUDE_DIRS})