linux-kernel - [PATCH] kbuild: support 'userldlibs' syntax

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Message-Id: <20231031181157.704314-1-masahiroy@kernel.org>
Date:   Wed,  1 Nov 2023 03:11:57 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>, linux-doc@...r.kernel.org
Subject: [PATCH] kbuild: support 'userldlibs' syntax

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

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 Documentation/kbuild/makefiles.rst | 4 ++++
 scripts/Makefile.userprogs         | 6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index d88d4f0f4f89..e9299971220a 100644
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -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.
diff --git a/scripts/Makefile.userprogs b/scripts/Makefile.userprogs
index fb415297337a..f3a7e1ef3753 100644
--- a/scripts/Makefile.userprogs
+++ b/scripts/Makefile.userprogs
@@ -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)
-- 
2.40.1