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From: Po-Hsu Lin <po-hsu.lin@canonical.com>
To: linux-fscrypt@vger.kernel.org
Subject: Re: [PATCH] Makefile: improve the cc-option compatibility
Date: Thu, 30 Jul 2020 21:21:38 +0800
Message-ID: <CAMy_GT-JNP0aTM3wC2mniMrREGkHGHuc2G=4Wmj99AFXULa6hQ@mail.gmail.com> (raw)
In-Reply-To: <20200730093520.26905-1-po-hsu.lin@canonical.com>

BTW this is for fsverity-utils.

I should put a [fsverity-utils] in the title, sorry about this.
I can resubmit one if you need.

Thank you
PHLin

On Thu, Jul 30, 2020 at 5:35 PM Po-Hsu Lin <po-hsu.lin@canonical.com> wrote:
>
> The build on Ubuntu Xenial with GCC 5.4.0 will fail with:
>     cc: error: unrecognized command line option ‘-Wimplicit-fallthrough’
>
> This unsupported flag is not skipped as expected.
>
> It is because of the /bin/sh shell on Ubuntu, DASH, which does not
> support this &> redirection. Use 2>&1 to solve this problem.
>
> Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
> ---
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index 7d7247c..a4ce55a 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -27,7 +27,7 @@
>  #
>  ##############################################################################
>
> -cc-option = $(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null &>/dev/null; \
> +cc-option = $(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null > /dev/null 2>&1; \
>               then echo $(1); fi)
>
>  CFLAGS ?= -O2 -Wall -Wundef                                    \
> --
> 2.25.1
>

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-30  9:35 Po-Hsu Lin
2020-07-30 13:21 ` Po-Hsu Lin [this message]
2020-08-01 18:12   ` Eric Biggers
2020-08-03  3:09     ` Po-Hsu Lin

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