Re: [Qemu-devel] [PATCH 01/14] dma: Convert conditional compilation of debug printfs to regular ifs

[Michael Tokarev]

28.04.2014 12:26, Marc Marí пишет:
> From: Marc Marí <5.markm...@gmail.com>
> 
> Modify debug macros as explained in 
> https://lists.gnu.org/archive/html/qemu-devel/2014-04/msg03642.html
> 
> Signed-off-by: Marc Marí <5.markm...@gmail.com>
> ---
>  hw/dma/i82374.c |   17 ++++++++++-------
>  hw/dma/i8257.c  |   24 +++++++++++++++++-------
>  hw/dma/rc4030.c |   13 +++++++++----
>  3 files changed, 36 insertions(+), 18 deletions(-)
> 
> diff --git a/hw/dma/i82374.c b/hw/dma/i82374.c
> index dc7a767..fff4e6f 100644
> --- a/hw/dma/i82374.c
> +++ b/hw/dma/i82374.c
> @@ -24,15 +24,18 @@
>  
>  #include "hw/isa/isa.h"
>  
> -//#define DEBUG_I82374
> +//#define DEBUG_I82374 1
>  
> -#ifdef DEBUG_I82374
> -#define DPRINTF(fmt, ...) \
> -do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0)
> -#else
> -#define DPRINTF(fmt, ...) \
> -do {} while (0)
> +#ifndef DEBUG_I82374
> +#define DEBUG_I82374 0
>  #endif
> +
> +#define DPRINTF(fmt, ...) \
> +    do { \
> +        if(DEBUG_I82374) { \
> +            fprintf(stderr, "I82374: " fmt, ## __VA_ARGS__); \
> +        } \
> +    } while (0)

Since this is the same pattern in all files touched, it can be generalized:

qemu-common.h:

#define QEMU_DPRINTF(cond,pfx,fmt,...) \
  do { \
    if (cond) {
      fprintf(stderr, pfx # ": " fmt, ## __VA_ARGS__); \
    } \
  while(0)

This file (and other):

#ifndef DEBUG_I82374
#define DEBUG_I82374 0
#endif
#define DPRINTF(fmt, ...) QEMU_DPRINTF(DEBUG_I82374, "I82374", fmt, ## 
__VA_ARGS__)


which is just 4 lines per file.

FWIW.

Thanks,

/mjt