libdlib.a recompile with -fPIC 问题

问题:
/usr/bin/ld: dlib_build/libdlib.a(threads_kernel_shared.o): relocation R_X86_64_32 against `_ZN4dlib21threads_kernel_shared14thread_starterEPv' can not be used when making a shared object; recompile with -fPIC

dlib_build/libdlib.a: could not read symbols: Bad value

解决方法:
重新编译dlib:
修改文件 dlib-18.18/examples/build/dlib_build/CMakeFiles/dlib.dir/flags.make
CXX_FLAGS后面加上-fPIC

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