> Fortunately linker plugin solves the problem here and this is why I want to > have it by default. GCC then can do effectively -fwhole-program for binaries > (since linker knows what will be bound elsewhere) and take advantage of > visibility((hidden)) hints for shared libraries same way. Most of important > shared libraries gets visibility ((hidden)) right. > > It is sad that LTO w/o linker plugin doesn't give that much benefits. > Ideas are welcome here.
Linker feedback will be limited here -- mostly global variable aliasing (as I remember only 2/3 spec programs benefit from it), it helps You don't get whole program points-to, whole program mod-ref (with context sensitivity), whole program structure layout. The latter are the real kickers (in terms of SPEC performance), but promoting LTO with those numbers can be misleading as many programs won't get it. David > > Honza >> sell lto without -fwhole-program. >> >> Thanks, >> >> David >> >> > Honza >> > >
