全网首发：relocation R_X86_64_PC32 against symbol can not be used when making a shared object recompile

• 错误

/usr/bin/ld: /usr/local/lib/libavcodec.a(vc1dsp_mmx.o): relocation R_X86_64_PC32 against symbol `ff_pw_9' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status

• 解决办法

　　网上所有教程，都说加-fPIC。大多情况下有用，个别情况下没用。比如编译FFmpeg。这个时候，你需要如下操作： 

# 没想到吧？大锅我要在这里export ECFLAG="-fPIC"
./configure \--extra-cflags="-fPIC "