linux-kernel - [PATCH RFC bpf-next 01/10] samples: bpf: Makefile: use --target from cross-compile

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Message-Id: <20190830005037.24004-2-ivan.khoronzhuk@linaro.org>
Date:   Fri, 30 Aug 2019 03:50:28 +0300
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     linux@...linux.org.uk, ast@...nel.org, daniel@...earbox.net,
        yhs@...com, davem@...emloft.net, jakub.kicinski@...ronome.com,
        hawk@...nel.org, john.fastabend@...il.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Subject: [PATCH RFC bpf-next 01/10] samples: bpf: Makefile: use --target from cross-compile

For cross compiling the target triple can be inherited from
cross-compile prefix as it's done in CLANG_FLAGS from kernel makefile.
So copy-paste this decision from kernel Makefile.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
---
 samples/bpf/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 1d9be26b4edd..61b7394b811e 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -196,6 +196,8 @@ BTF_PAHOLE ?= pahole
 # Detect that we're cross compiling and use the cross compiler
 ifdef CROSS_COMPILE
 HOSTCC = $(CROSS_COMPILE)gcc
+CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%))
+else
 CLANG_ARCH_ARGS = -target $(ARCH)
 endif
 
-- 
2.17.1