linux-kernel - Re: [PATCH v3 bpf-next 09/14] samples: bpf: makefile: use own flags but not host when cross compile

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Date:   Tue, 17 Sep 2019 13:14:06 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>, ast@...nel.org,
        daniel@...earbox.net, yhs@...com, davem@...emloft.net,
        jakub.kicinski@...ronome.com, hawk@...nel.org,
        john.fastabend@...il.com
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH v3 bpf-next 09/14] samples: bpf: makefile: use own flags
 but not host when cross compile

Hello!

On 16.09.2019 13:54, Ivan Khoronzhuk wrote:

> While compile natively, the hosts cflags and ldflags are equal to ones

   Compiling. Host's.

> used from HOSTCFLAGS and HOSTLDFLAGS. When cross compiling it should
> have own, used for target arch. While verification, for arm, arm64 and
> x86_64 the following flags were used alsways:
> 
> -Wall
> -O2
> -fomit-frame-pointer
> -Wmissing-prototypes
> -Wstrict-prototypes
> 
> So, add them as they were verified and used before adding
> Makefile.target, but anyway limit it only for cross compile options as
> for host can be some configurations when another options can be used,
> So, for host arch samples left all as is, it allows to avoid potential
> option mistmatches for existent environments.

    Mismatches.

> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
[...]

MBR, Sergei