On Thu, Jul 02, 2020 at 04:06:32PM +0300, Michael Tokarev wrote: > 01.07.2020 12:12, Christophe de Dinechin wrote: > .. > >>> # Build libraries > >>> > >>> +libqemuutil.a-libs += $(call extract-libs, $(util-obj-y) $(trace-obj-y) > >>> $(stub-obj-y)) > >>> +libvhost-user.a-libs += $(call extract-libs, $(libvhost-user-obj-y) > >>> $(util-obj-y) $(stub-obj-y)) > .. > >> Another thing I wonder about: the purpose of the .a files is to compile > >> all object files and only link those .o files needed by the program > >> (i.e. a subset of the .a file). > > > > I believe that what you are saying is that by passing the required libraries > > automatically, the binaries that use libqemuutil.a will inherit undesired > > ldd dependencies. Indeed, a quick experiment shows that if you pass a -l > > option, the library dependency is recorded even if no symbol in that library > > is used. I saw no obvious linker option to address that. > > There's --as-needed and --no-as-needed ld flag (used with cc as > -Wl,--as-needed), > which is designed for this very case.
Nice, sounds like a solution. So -Wl,--as-needed should be at the end of the command-line followed by $(libqemuutil.a-libs). Stefan
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