Dne 3.2.2016 v 22:20 Al Viro napsal(a): > From: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > > Collect the symbols exported by anything that goes into lib.a and > add an empty object (lib-exports.o) with explicit undefs for each > of those to obj-y. > > That allows to relax the rules regarding the use of exports in > lib-* objects - right now an object with export can be in lib-* > only if we are guaranteed that there always will be users in > built-in parts of the tree, otherwise it needs to be in obj-*. > As the result, we have an unholy mix of lib- and obj- in lib/Makefile > and (especially) in arch/*/lib/Makefile. Moreover, a change in > generic part of the kernel can lead to mysteriously missing exports > on some configs. With this change we don't have to worry about > that anymore. > > One side effect is that built-in.o now pulls everything with exports > from the corresponding lib.a (if such exists). That's exactly what > we want for linking vmlinux and fortunately it's almost the only thing > built-in.o is used in. arch/ia64/hp/sim/boot/bootloader is the only > exception and it's easy to get rid of now - just turn everything in > arch/ia64/lib into lib-* and don't bother with arch/ia64/lib/built-in.o > anymore. > > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > --- > arch/ia64/hp/sim/boot/Makefile | 2 +- > arch/ia64/lib/Makefile | 8 +++----- > scripts/Makefile.build | 20 ++++++++++++++++++++ > 3 files changed, 24 insertions(+), 6 deletions(-) Acked-by: Michal Marek <mmarek@xxxxxxx> Sorry for the delay. > --- a/scripts/Makefile.build > +++ b/scripts/Makefile.build > @@ -81,6 +81,7 @@ endif > > ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) > lib-target := $(obj)/lib.a > +obj-y += $(obj)/lib-ksyms.o > endif > > ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),) > @@ -363,6 +364,25 @@ $(lib-target): $(lib-y) FORCE > $(call if_changed,link_l_target) > > targets += $(lib-target) > + > +dummy-object = $(obj)/__lib_exports.o > +ksyms-lds = $(obj)/lib-ksyms.lds Just a really minor nitpick (no need to resend just because of it): We typically use dotfiles for temporary stuff, e.g. dummy-object = $(obj)/.lib_exports.o ksyms-lds = $(dot-target).lds Michal -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
