linux-kernel - [PATCH v2 09/15] samples: connector: build sample program for target architecture

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Date:   Wed, 29 Apr 2020 12:45:21 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     bpf <bpf@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH v2 09/15] samples: connector: build sample program for target architecture

This userspace program includes UAPI headers exported to usr/include/.
'make headers' always works for the target architecture (i.e. the same
architecture as the kernel), so the sample program should be built for
the target as well. Kbuild now supports 'userprogs' for that.

$(CC) can always compile cn_text.o since it is the kenrel-space code,
but building ucon requires libc.

I guarded it by:

  always-$(CONFIG_CC_CAN_LINK) := $(userprogs)

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Acked-by: Sam Ravnborg <sam@...nborg.org>
---

Changes in v2: None

 samples/connector/Makefile | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/samples/connector/Makefile b/samples/connector/Makefile
index b785cbde5ffa..50cb40e09a7b 100644
--- a/samples/connector/Makefile
+++ b/samples/connector/Makefile
@@ -1,13 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_SAMPLE_CONNECTOR) += cn_test.o
 
-# List of programs to build
-hostprogs := ucon
-always-y := $(hostprogs)
+userprogs := ucon
+always-$(CONFIG_CC_CAN_LINK) := $(userprogs)
 
-HOSTCFLAGS_ucon.o += -I$(objtree)/usr/include
-
-all: modules
-
-modules clean:
-	$(MAKE) -C ../.. M=$(CURDIR) $@
+userccflags += -I usr/include
-- 
2.25.1