Hi! On Tue, Mar 09, 2021 at 06:19:30AM +0000, Christophe Leroy wrote: > With some defconfig including CONFIG_CC_OPTIMIZE_FOR_SIZE, > (for instance mvme5100_defconfig and ps3_defconfig), gcc 5 > generates a call to _restgpr_31_x.
> I don't know if there is a way to tell GCC not to emit that call, because at > the end we get more instructions than needed. The function is required by the ABI, you need to have it. You get *fewer* insns statically, and that is what -Os is about: reduce the size of the binaries. (The only reason you get such problems is because Linux does not have all of libgcc. You can have that *and* have some symbols cause link errors, it isn't rocket science). Segher
