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Add PROPERTIES POSITION_INDEPENDENT_CODE option to fix the
following error:

/usr/bin/ld: ../../third_party/xxHash/libxxhash.a(xxhash.c.o):
relocation R_X86_64_32S against `.rodata' can not be used when
making a shared object; recompile with -fPIC

Trying to link a non-PIC static library libxxhash.a into a
.so shared library, which is not allowed. The object file
xxhash.c.o must be recompiled with explicit -fPIC support.

In some OS distributions, g++ exists in the following form:

  # ls -l /usr/bin/g++*
  -rwxr-xr-x 4 root root 985784 Dec  9 12:51 /usr/bin/g++

So make sure to add g++ to the compiler list as well.