Richard Guenther <richard.guent...@gmail.com> writes: > > You then can do > > gcc $OPTIONS -flto a.c -o a.o > gcc $OPTIONS -flto b.c -o b.o > gcc $OPTIONS -ffixed-r9 -ffixed-r10 -flto d.c -o d.o > gcc $OPTIONS -ffixed-r9 -ffixed-r10 -flto e.c -o e.o > gcc $OPTIONS -flto a.o b.o -o non-fixed-reg-part.o -r -nostdlib > gcc $OPTIONS -flto -ffixed-r9 -ffixed-r10 d.o e.o -o fixed-reg-part.o > -r -nostdlib > gcc non-fixed-reg-part.o fixed-reg-part.o > > thus, optimize both pieces via partial LTO linking (-r, maybe the -nostdlib is > not needed) and then do the final link separately.
Note that ld -r with LTO has some problems in 4.6, it will work fully reliable. This has been fixed in 4.7. -Andi -- a...@linux.intel.com -- Speaking for myself only
