In fact -O* flags need to be passed to the linker too for LTO to do any optimizations at all.
So if I call gcc -O2 -flto x.o y.o, libtool will need to pass both -O2 and -flto. And of course any -f* -m* flags that affect code generation. Also -fuser-linker-plugin needs to be passed on by libtool. P.S.: In fact for LTO I think it'd make sense to pass all of CFLAGS/CXXFLAGS to the linker, since they affect code generation at link time now. Or document the fact that you need to export LDFLAGS="$CFLAGS" if you want LTO to work. Best regards, --Edwin -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
