将 liblog4cpp.a 链接进一个 so， 编译时出现 ：
liblog4cpp.a(RollingFileAppender.o): relocation R_X86_64_32 against `a local symbol' can not be used when making a shared object; recompile with -fPIC
1
重新编译log4cpp
$ ./configure --enable-shared CFLAGS=-fPIC CXXFLAGS=-fPIC
$ make -j8
from：https://blog.csdn.net/kevin_darkelf/article/details/56016208
