|Message: Why is CXXFLAG -fPIC not used with MT?||Not Logged In (login)|
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I compiled and installed the final version of GEANT4 10.0.0 as a shared build with MT, and tried to build one of the examples (basic/B1). Upon compilation I encountered the following error message:
/usr/bin/ld: B1ActionInitialization.o: relocation R_X86_64_32S against `_ZTV22B1ActionInitialization' can not be used when making a shared object; recompile with -fPIC B1ActionInitialization.o: error adding symbols: Bad value
Then I added -fPIC to my CXXFLAGS in my makefile, and compiled the example successfully.
After further investigation I found the following block in share/Geant4-10.0.0/geant4make/config/sys/Linux-g++.gmk:
ifdef G4LIB_BUILD_SHARED ifndef G4MULTITHREADED CXXFLAGS += -fPIC FCFLAGS += -fPIC CCFLAGS += -fPIC endif endif
This of course disables -fPIC option with a shared build and MT. What is the reason to disable that option in MT mode? What is the intended way to avoid that problem?
kind regards, Christoph
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