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logging: introduce LOG_DISABLE_FANCY_OUTPUT_FORMATTING to save flash

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The new Logger subsys uses a very robust formatter function in minimal
libc: _prf().  This adds up to ~3K flash.  For resource constrained
devices running samples that don't use the extra formatting options,
allow them to select LOG_DISABLE_FANCY_OUTPUT_FORMATTING to revert
back to vprintk.

MCUBOOT is one such sample that has a very limited amount of output
and benefits from the flash savings due to small bootloader partition
sizes.

Signed-off-by: Michael Scott <mike@foundries.io>
This commit is contained in:
Michael Scott 2019-02-01 12:06:44 -08:00 • committed by Anas Nashif
commit d646eff3d3
2 changed files with 12 additions and 2 deletions
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6
subsys/logging/log_output.c
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@ -114,7 +114,8 @@ static int print_formatted(const struct log_output *log_output,
int length = 0;
va_start(args, fmt);
#if !defined(CONFIG_NEWLIB_LIBC) && !defined(CONFIG_ARCH_POSIX)
#if !defined(CONFIG_NEWLIB_LIBC) && !defined(CONFIG_ARCH_POSIX) && \
!defined(CONFIG_LOG_DISABLE_FANCY_OUTPUT_FORMATTING)
length = _prf(out_func, (void *)log_output, (char *)fmt, args);
#else
_vprintk(out_func, (void *)log_output, fmt, args);
@ -551,7 +552,8 @@ void log_output_string(const struct log_output *log_output,
level, domain_id, source_id);
}
#if !defined(CONFIG_NEWLIB_LIBC) && !defined(CONFIG_ARCH_POSIX)
#if !defined(CONFIG_NEWLIB_LIBC) && !defined(CONFIG_ARCH_POSIX) && \
!defined(CONFIG_LOG_DISABLE_FANCY_OUTPUT_FORMATTING)
length = _prf(out_func, (void *)log_output, (char *)fmt, ap);
#else
_vprintk(out_func, (void *)log_output, fmt, ap);