Commit 5f56cb03 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild: support 'userldlibs' syntax 



This syntax is useful to specify libraries linked to all userspace
programs in the Makefile.

Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent 1bfaa37f

Documentation/kbuild/makefiles.rst

+4 −0
Original line number Diff line number Diff line
@@ -937,6 +937,10 @@ Example:: 
  # net/bpfilter/Makefile

  bpfilter_umh-userldflags += -static



To specify libraries linked to a userspace program, you can use

``<executable>-userldlibs``. The ``userldlibs`` syntax specifies libraries

linked to all userspace programs created in the current Makefile.



When linking bpfilter_umh, it will be passed the extra option -static.



From command line, :ref:`USERCFLAGS and USERLDFLAGS <userkbuildflags>` will also be used.

scripts/Makefile.userprogs

+3 −3
Original line number Diff line number Diff line
@@ -19,19 +19,19 @@ user-cobjs := $(addprefix $(obj)/, $(user-cobjs)) 
user_ccflags	= -Wp,-MMD,$(depfile) $(KBUILD_USERCFLAGS) $(userccflags) \

			$($(target-stem)-userccflags)

user_ldflags	= $(KBUILD_USERLDFLAGS) $(userldflags) $($(target-stem)-userldflags)

user_ldlibs	= $(userldlibs) $($(target-stem)-userldlibs)



# Create an executable from a single .c file

quiet_cmd_user_cc_c = CC [U]  $@

      cmd_user_cc_c = $(CC) $(user_ccflags) $(user_ldflags) -o $@ $< \

		      $($(target-stem)-userldlibs)

		      $(user_ldlibs)

$(user-csingle): $(obj)/%: $(src)/%.c FORCE

	$(call if_changed_dep,user_cc_c)



# Link an executable based on list of .o files

quiet_cmd_user_ld = LD [U]  $@

      cmd_user_ld = $(CC) $(user_ldflags) -o $@ \

		    $(addprefix $(obj)/, $($(target-stem)-objs)) \

		    $($(target-stem)-userldlibs)

		    $(addprefix $(obj)/, $($(target-stem)-objs)) $(user_ldlibs)

$(user-cmulti): FORCE

	$(call if_changed,user_ld)

$(call multi_depend, $(user-cmulti), , -objs)