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log: Add log_nop() to avoid unused-variable warnings

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If a log statement includes a variable and logging is disabled, this can
generate warnings about unused variables. Add a bit more complexity to the
macros to avoid this for the common case.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-09-25 08:56:23 -06:00 committed by Bin Meng
parent 0b7ebee38e
commit fd42948fc9
1 changed files with 26 additions and 7 deletions
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33
include/log.h
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@ -76,6 +76,18 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
int line, const char *func, const char *fmt, ...)
__attribute__ ((format (__printf__, 6, 7)));
static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
const char *file, int line, const char *func,
const char *fmt, ...)
__attribute__ ((format (__printf__, 6, 7)));
static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
const char *file, int line, const char *func,
const char *fmt, ...)
{
return 0;
}
/* Define this at the top of a file to add a prefix to debug messages */
#ifndef pr_fmt
#define pr_fmt(fmt) fmt
@ -101,13 +113,14 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
#define log_io(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
#else
#define _LOG_MAX_LEVEL LOGL_INFO
#define log_err(_fmt...)
#define log_warning(_fmt...)
#define log_notice(_fmt...)
#define log_info(_fmt...)
#define log_debug(_fmt...)
#define log_content(_fmt...)
#define log_io(_fmt...)
#define log_err(_fmt...) log_nop(LOG_CATEGORY, LOGL_ERR, ##_fmt)
#define log_warning(_fmt...) log_nop(LOG_CATEGORY, LOGL_WARNING, ##_fmt)
#define log_notice(_fmt...) log_nop(LOG_CATEGORY, LOGL_NOTICE, ##_fmt)
#define log_info(_fmt...) log_nop(LOG_CATEGORY, LOGL_INFO, ##_fmt)
#define log_debug(_fmt...) log_nop(LOG_CATEGORY, LOGL_DEBUG, ##_fmt)
#define log_content(_fmt...) log_nop(LOG_CATEGORY, \
LOGL_DEBUG_CONTENT, ##_fmt)
#define log_io(_fmt...) log_nop(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
#endif
#if CONFIG_IS_ENABLED(LOG)
@ -129,6 +142,12 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
#define log(_cat, _level, _fmt, _args...)
#endif
#define log_nop(_cat, _level, _fmt, _args...) ({ \
int _l = _level; \
_log_nop((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
__func__, pr_fmt(_fmt), ##_args); \
})
#ifdef DEBUG
#define _DEBUG 1
#else