Still confused about PIE/PIC and default build flags

[Richard Shaw <hobbes1069@xxxxxxxxx>]

So I run into this occasionally and it's still not clear to me. In this specific case I'm trying to build nanomq[1] and I get the following error:

/usr/bin/ld: CMakeFiles/nano_test.dir/test.c.o: relocation R_X86_64_32 against `.rodata' can not be used when making a PIE object; recompile with -fPIE
/usr/bin/ld: CMakeFiles/nano_test.dir/test_hash.c.o: relocation R_X86_64_32 against `.rodata' can not be used when making a PIE object; recompile with -fPIE
[ 36%] Building C object nng/CMakeFiles/nng.dir/src/sp/protocol/reqrep0/rep.c.o
/usr/bin/ld: CMakeFiles/nano_test.dir/test_dbtree.c.o: relocation R_X86_64_32 against symbol `topic0' can not be used when making a PIE object; recompile with -fPIE

Any hints are appreciated.

Thanks,

Richard

[1] https://github.com/emqx/nanomq

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