Re: [PATCH 12/23] libblkid: use pre-processor to optimize out code

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On Sun, Sep 28, 2014 at 08:51:45PM +0100, Sami Kerola wrote:
> Signed-off-by: Sami Kerola <kerolasa@xxxxxx>
> ---
>  libblkid/src/superblocks/zfs.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/libblkid/src/superblocks/zfs.c b/libblkid/src/superblocks/zfs.c
> index 6ffa24d..088d110 100644
> --- a/libblkid/src/superblocks/zfs.c
> +++ b/libblkid/src/superblocks/zfs.c
> @@ -156,7 +156,6 @@ static void zfs_extract_guid_name(blkid_probe pr, loff_t offset)
>  	}
>  }
>  
> -#define zdebug(fmt, ...)	do {} while(0)
>  /*#define zdebug(fmt, a...)	fprintf(stderr, fmt, ##a)*/
>  
>  /* ZFS has 128x1kB host-endian root blocks, stored in 2 areas at the start
> @@ -172,7 +171,9 @@ static int probe_zfs(blkid_probe pr,
>  	int tried;
>  	int found;
>  
> +#ifdef zdebug
>  	zdebug("probe_zfs\n");
> +#endif

 no, this is bad way. It's always better to use empty macros than
 #ifdef, ifdef is evil

    Karel


-- 
 Karel Zak  <kzak@xxxxxxxxxx>
 http://karelzak.blogspot.com
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