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kbuild: support 'userldlibs' syntax

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

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2023-11-01 03:11:57 +09:00
parent 1bfaa37fd3
commit 5f56cb030e
2 changed files with 7 additions and 3 deletions
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4
Documentation/kbuild/makefiles.rst
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@ -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.

6
scripts/Makefile.userprogs
View File

@ -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)