With -fno-plt, I see that there is reference to *call *memcpy@GOTPCREL(%rip)* Excuse me if this is stupid question, but is it possible to instruct GCC to insert plain memcpy call here? (With no PLT or GOTPCREL or any other relocation) Like this: *call memcpy* (Similar to the case when -fPIE flag is not specified?) -- GampuZ On Wed, Jul 25, 2018 at 3:45 PM Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> wrote: > On 2018-07-25 15:29 +0530, Gampu Z wrote: > > Is there any way I can instruct GCC to insert call to memcpy and not to > > memcpy@PLT? > > From <https://gcc.gnu.org/onlinedocs/gcc-8.1.0/gcc/Code-Gen-Options.html>: > > > -fno-plt > > Do not use the PLT for external function calls in position-independent > code. > > Instead, load the callee address at call sites from the GOT and branch > to it. > > This leads to more efficient code by eliminating PLT stubs and exposing > GOT > > loads to optimizations. On architectures such as 32-bit x86 where PLT > stubs > > expect the GOT pointer in a specific register, this gives more register > > allocation freedom to the compiler. Lazy binding requires use of the PLT; > > with -fno-plt all external symbols are resolved at load time. > -- > Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> > School of Aerospace Science and Technology, Xidian University >
