relocation R_X86_64_PC32 against symbol can not be used when making a shared object; recompile with -fPIC

项目需要链接absl，absl默认编译为静态库，但项目编译为动态库，动态库不能链接静态库，编译时报错

relocation R_X86_64_PC32 against symbol can not be used when making a shared object; recompile with -fPIC

• 解决办法1
  为absl CMakeLists.txt 添加编译选项，重新编译安装absl

set(CMAKE_CXX_FLAGS "-fPIC")

or

set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)

• 解决办法2
  将absl编译为动态库，cmake编译时设置-DBUILD_SHARED_LIBS=ON