[U-Boot] [PATCH] cmd: mtd: fix compilation warning for help when SYS_LONGHELP=n

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hi Quentin,

Quentin Schulz <quentin.schulz@bootlin.com> wrote on Thu, 17 Jan 2019
10:18:47 +0100:

> cmd/mtd.c:447:13: warning: ‘mtd_help_text’ defined but not used [-Wunused-variable]
> static char mtd_help_text[] =
>             ^~~~~~~~~~~~~
> 
> When SYS_LONGHELP is not defined. After looking at how other commands
> work, we should surround the whole help text (even its declaration) with
> an #ifdef CONFIG_SYS_LONGHELP, since it's compiled out when calling
> _CMD_HELP[1] on the help text variable argument to U_BOOT_CMD.
> 
> [1] https://elixir.bootlin.com/u-boot/latest/source/include/command.h#L181
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
> ---
>  cmd/mtd.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/cmd/mtd.c b/cmd/mtd.c
> index 6142223984..361813a4a1 100644
> --- a/cmd/mtd.c
> +++ b/cmd/mtd.c
> @@ -444,8 +444,8 @@ static int do_mtd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  	return CMD_RET_SUCCESS;
>  }
>  
> -static char mtd_help_text[] =
>  #ifdef CONFIG_SYS_LONGHELP
> +static char mtd_help_text[] =
>  	"- generic operations on memory technology devices\n\n"
>  	"mtd list\n"
>  	"mtd read[.raw][.oob]                  <name> <addr> [<off> [<size>]]\n"
> @@ -466,8 +466,7 @@ static char mtd_help_text[] =
>  	"\t\t* must be a multiple of a block for erase\n"
>  	"\t\t* must be a multiple of a page otherwise (special case: default is a page with dump)\n"
>  	"\n"
> -	"The .dontskipff option forces writing empty pages, don't use it if unsure.\n"
> +	"The .dontskipff option forces writing empty pages, don't use it if unsure.\n";
>  #endif
> -	"";
>  
>  U_BOOT_CMD(mtd, 10, 1, do_mtd, "MTD utils", mtd_help_text);

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>


Thanks,
Miquèl