On Thu, 24 Jan 2019, Peng Yu wrote: > Is it because gcc enables -fPIC by default, but clang does not? I > don't see this documented. Or it is due to some other reasons. On what > systems gcc enables -fPIC by default? There are platforms (e.g. Darwin) where all code is implicitly PIC by convention (but there Clang will emit position-independent code as well), but in your case the issue is likely because in your distribution GCC is configured to produce PIE by default (see --enable-default-pie in output of gcc -v): > configure:3772: gcc -g -finstrument-functions > -L/root/linux/bin/wrappercomposite/src/xplat/llvmxplat/src/mkvar/bin/Linux > conftest.c -ltrace >&5 > /usr/bin/ld: /root/linux/bin/wrappercomposite/src/xplat/llvmxplat/src/mkvar/bin/Linux/libtrace.a(trace.o): > relocation R_X86_64_32S against `.bss' can not be used when making a > PIE object; recompile with -fPIC ^^^^^^^^^ (as the error message hints) Hope that helps. Alexander
