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Date:   Tue, 17 Nov 2020 11:22:34 +0100 (CET)
From:   Julia Lawall <julia.lawall@inria.fr>
To:     Sumera Priyadarsini <sylphrenadin@gmail.com>
cc:     Gilles.Muller@lip6.fr, nicolas.palix@imag.fr,
        michal.lkml@markovi.net, cocci@systeme.lip6.fr,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] scripts: coccicheck: Correct usage of make coccicheck
In-Reply-To: <20201111111256.ea5l7slw4cc2fggm@adolin>
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On Wed, 11 Nov 2020, Sumera Priyadarsini wrote:

> The command "make coccicheck C=1 CHECK=scripts/coccicheck" results in the
> error:
>         ./scripts/coccicheck: line 65: -1: shift count out of range
>
> This happens because every time the C variable is specified,
> the shell arguments need to be "shifted" in order to take only
> the last argument, which is the C file to test. These shell arguments
> mostly comprise flags that have been set in the Makefile. However,
> when coccicheck is specified in the make command as a rule, the
> number of shell arguments is zero, thus passing the invalid value -1
> to the shift command, resulting in an error.
>
> Modify coccicheck to print correct usage of make coccicheck so as to
> avoid the error.

With this, one still gets the error from shift.  Could you move the test
so that one only gets the error message?

julia

>
> Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
> ---
>  scripts/coccicheck | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/scripts/coccicheck b/scripts/coccicheck
> index 209bb0427b43..b990c8a60a94 100755
> --- a/scripts/coccicheck
> +++ b/scripts/coccicheck
> @@ -63,6 +63,18 @@ if [ "$C" = "1" -o "$C" = "2" ]; then
>
>      # Take only the last argument, which is the C file to test
>      shift $(( $# - 1 ))
> +    err=$?
> +    if [[ $err -ne 0 ]]; then
> +	    echo ''
> +	    echo 'Specifying both the variable "C" and rule "coccicheck" in the make
> +command results in a shift count error.'
> +	    echo ''
> +	    echo 'Try specifying "scripts/coccicheck" as a value for the CHECK variable instead.'
> +	    echo ''
> +	    echo 'Example:	make C=2 CHECK=scripts/coccicheck drivers/staging/wfx/hi_t.o'
> +	    echo ''
> +	    exit 1
> +    fi
>      OPTIONS="$COCCIINCLUDE $1"
>
>      # No need to parallelize Coccinelle since this mode takes one input file.
> --
> 2.25.1
>
>