On Tue, Apr 27, 2010 at 6:30 PM, Bingfeng Mei <b...@broadcom.com> wrote: > Hello, > I have been playing with LTO. I notice that LTO doesn't work when > object files are achived into static library files and the final > binary is linked against them, although these object files are compiled > with -flto and I can see all the lto related sections in .a files. > Is this what is described in LTO Wiki page? > > "As an added feature, LTO will take advantage of the plugin feature > in gold. This allows the compiler to pick up object files that may > have been stored in library archives. " > > So do I have to use gold to solve this issue?
Yes. Or you fix collect2 to do processing of archives and hand lto1 the required information (it expects archive components with LTO bytecode like archiv...@offset with offset being the offset of the .o file with LTO bytecode inside the archive). See lto/lto-elf.c:lto_obj_file_open for "details". Richard. > Many thanks, > Bingfeng >
