This sounds like a RTFM question. https://gcc.gnu.org/onlinedocs/gcc-6.1.0/gcc/Code-Gen-Options.html ------------------ Best regards, lh_mouse 2016-07-10 ------------------------------------------------------------- 发件人：Yubin Ruan <ablacktshirt@xxxxxxxxx> 发送日期：2016-07-10 22:15 收件人：gcc-help 抄送： 主题：what does -fno-pic do Hi, I am reading some OS kernel codes, and I find that in the Makefile used to build the kernel, there is a **-fno-pic** flag. I totally don't understand what that mean. I try to find some description from the man pages but can find no direct description about that flag(same for the **-fpic** flags). All I can find is something like: For Darwin, only the -m64 option also turns off the -fno-pic and -mdynamic-no-pic options. blah blah blah.... I try to google it but it seems that people rarely discuss it on the Web. Does the **pic** in that flag represent Programmable Interrupt Controller that is used by the kernel the control interrupts to CPU ? If it is, why no pic ? what does it really mean ? And, in addition, what would that flag influence the layout of the kernel image ? Thanks, Ruan.
