GCC 4.8在编译单元头中插入版本4，即使使用-gdwarf-2也是如此

I compiled an application with GCC 4.8 and I'm trying to debug it on an older system that does not have GDB 7.5+ (which supposedly added support for DWARF-4). Upgrading GDB on that system is not an option. I can't debug it because GDB outputs the following message:I compiled an application with GCC 4.8 and I'm