linux-kernel - [PATCH 09/16] samples: hidraw: build sample program for target architecture

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Date:   Thu, 23 Apr 2020 16:39:22 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     bpf@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 09/16] samples: hidraw: 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 must be built for
the target as well. Kbuild now supports the 'userprogs' syntax to
describe it cleanly.

I also guarded the CONFIG option by 'depends on CC_CAN_LINK' because
$(CC) may not necessarily provide libc.

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

 samples/Kconfig         | 2 +-
 samples/hidraw/Makefile | 9 +++------
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/samples/Kconfig b/samples/Kconfig
index ff9126ef1c79..2e0ef2cc1aa8 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -118,7 +118,7 @@ config SAMPLE_CONNECTOR
 
 config SAMPLE_HIDRAW
 	bool "hidraw sample"
-	depends on HEADERS_INSTALL
+	depends on CC_CAN_LINK && HEADERS_INSTALL
 
 config SAMPLE_PIDFD
 	bool "pidfd sample"
diff --git a/samples/hidraw/Makefile b/samples/hidraw/Makefile
index 8bd25f77671f..752ed03cdb64 100644
--- a/samples/hidraw/Makefile
+++ b/samples/hidraw/Makefile
@@ -1,8 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-# List of programs to build
-hostprogs := hid-example
-always-y := $(hostprogs)
+userprogs := hid-example
+always-y := $(userprogs)
 
-HOSTCFLAGS_hid-example.o += -I$(objtree)/usr/include
-
-all: hid-example
+user-ccflags += -I usr/include
-- 
2.25.1