zephyr: logging: 32 bit float values don't work.

Code

float x = 1.234f;
printf("this is a 32 bit float %f\n", x);
LOG_INF("this is a 32 bit float %f", x);

Output

***** Booting Zephyr OS build v2.0.0-rc1-50-g70640334730b ***** … this is a 32 bit float 1.234000 [00:00:00.008,000] <inf> ggm.main: this is a 32 bit float 0.000000

Notes CONFIG_LOG_ENABLE_FANCY_OUTPUT_FORMATTING=y This uses the minimal libc print formatter for the log messages. The print formatter works for float formatting when invoked via printf, suggesting that the float value is somehow being clobbered in the log functions.

Environment

• OS: Linux
• Toolchain: gcc-arm-none-eabi-8-2018-q4-major
• Board: mimxrt1020_evk