linux-kernel - Re: [PATCH v3 bpf-next 13/14] samples: bpf: makefile: add sysroot support

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Message-ID: <20190918110907.GE2908@khorivan>
Date:   Wed, 18 Sep 2019 14:09:08 +0300
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yonghong Song <yhs@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        john fastabend <john.fastabend@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        clang-built-linux@...glegroups.com,
        sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH v3 bpf-next 13/14] samples: bpf: makefile: add sysroot
 support

On Tue, Sep 17, 2019 at 10:23:57PM -0700, Andrii Nakryiko wrote:
>On Mon, Sep 16, 2019 at 4:00 AM Ivan Khoronzhuk
><ivan.khoronzhuk@...aro.org> wrote:
>>
>> Basically it only enables that was added by previous couple fixes.
>> Sysroot contains correct libs installed and its headers ofc. Useful
>
>Please, let's not use unnecessary abbreviations/slang. "Of course" is
>not too long and is a proper English, let's stick to it.
>
>> when working with NFC or virtual machine.
>>
>> Usage:
>>
>> clean (on demand)
>>     make ARCH=arm -C samples/bpf clean
>>     make ARCH=arm -C tools clean
>>     make ARCH=arm clean
>>
>> configure and install headers:
>>
>>     make ARCH=arm defconfig
>>     make ARCH=arm headers_install
>>
>> build samples/bpf:
>>     make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- samples/bpf/ \
>>     SYSROOT="path/to/sysroot"
>>
>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
>> ---
>>  samples/bpf/Makefile | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
>> index 133123d4c7d7..57ddf055d6c3 100644
>> --- a/samples/bpf/Makefile
>> +++ b/samples/bpf/Makefile
>> @@ -194,6 +194,11 @@ TPROGS_CFLAGS += -I$(srctree)/tools/lib/
>>  TPROGS_CFLAGS += -I$(srctree)/tools/include
>>  TPROGS_CFLAGS += -I$(srctree)/tools/perf
>>
>> +ifdef SYSROOT
>> +TPROGS_CFLAGS += --sysroot=${SYSROOT}
>> +TPROGS_LDFLAGS := -L${SYSROOT}/usr/lib
>
>Please stay consistent: $() instead of ${}?
Yes, thanks.

>
>> +endif
>> +
>>  EXTRA_CXXFLAGS := $(TPROGS_CFLAGS)
>>
>>  # options not valid for C++
>> --
>> 2.17.1
>>

-- 
Regards,
Ivan Khoronzhuk