Using Logging Module in Header Only CPP

[rcolatobe]

Hello, I have a few unit test suites that are all totally implemented in header files. I understand that each function must have LOG_MODULE_DELCARE and in a source file LOG_MODULE_REGISTER must be called once in order to use the logging module in these test suites.

I am trying to register a logging module for each test suite in the same source (main.cpp) using the code shown below.

#include <zephyr/logging/log.h> LOG_MODULE_REGISTER(main); LOG_MODULE_REGISTER(a_sensor_tests); LOG_MODULE_REGISTER(b_sensor_tests);

and get the following build error.

In file included from ..../UnitTests/main.cpp:8: /zephyr/include/zephyr/logging/log.h:405:17: error: redefinition of ‘const log_source_const_data* __log_current_const_data’ 405 | __log_current_const_data __unused = \ | ^~~~~~~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:370:9: note: in expansion of macro ‘LOG_MODULE_DECLARE’ 370 | LOG_MODULE_DECLARE(__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~ ..../UnitTests/main.cpp:47:1: note: in expansion of macro ‘LOG_MODULE_REGISTER’ 47 | LOG_MODULE_REGISTER(b_sensor_tests); | ^~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:405:17: note: ‘const log_source_const_data* __log_current_const_data’ previously defined here 405 | __log_current_const_data __unused = \ | ^~~~~~~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:370:9: note: in expansion of macro ‘LOG_MODULE_DECLARE’ 370 | LOG_MODULE_DECLARE(__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~ ..../UnitTests/main.cpp:46:1: note: in expansion of macro ‘LOG_MODULE_REGISTER’ 46 | LOG_MODULE_REGISTER(main); | ^~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:411:17: error: redefinition of ‘log_source_dynamic_data* __log_current_dynamic_data’ 411 | __log_current_dynamic_data __unused = \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:370:9: note: in expansion of macro ‘LOG_MODULE_DECLARE’ 370 | LOG_MODULE_DECLARE(__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~ ..../UnitTests/main.cpp:47:1: note: in expansion of macro ‘LOG_MODULE_REGISTER’ 47 | LOG_MODULE_REGISTER(b_sensor_tests); | ^~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:411:17: note: ‘log_source_dynamic_data* __log_current_dynamic_data’ previously defined here 411 | __log_current_dynamic_data __unused = \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:370:9: note: in expansion of macro ‘LOG_MODULE_DECLARE’ 370 | LOG_MODULE_DECLARE(__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~ ..../UnitTests/main.cpp:46:1: note: in expansion of macro ‘LOG_MODULE_REGISTER’ 46 | LOG_MODULE_REGISTER(main); | ^~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:417:31: error: redefinition of ‘const uint32_t __log_level’ 417 | static const uint32_t __log_level __unused = \ | ^~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:370:9: note: in expansion of macro ‘LOG_MODULE_DECLARE’ 370 | LOG_MODULE_DECLARE(__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~ ..../UnitTests/main.cpp:47:1: note: in expansion of macro ‘LOG_MODULE_REGISTER’ 47 | LOG_MODULE_REGISTER(b_sensor_tests); | ^~~~~~~~~~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:417:31: note: ‘const uint32_t __log_level’ previously defined here 417 | static const uint32_t __log_level __unused = \ | ^~~~~~~~~~~ /zephyr/include/zephyr/logging/log.h:370:9: note: in expansion of macro ‘LOG_MODULE_DECLARE’ 370 | LOG_MODULE_DECLARE(__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~ ...../UnitTests/main.cpp:46:1: note: in expansion of macro ‘LOG_MODULE_REGISTER’ 46 | LOG_MODULE_REGISTER(main);

The best solution I've had to the issue is creating a source file for each test suite that has the following

#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(b_sensor_tests)

I intend to transition my project from calling printk directly to using the Logging Module and there are quite a few header only implementations, so if possible, I'd like to avoid creating source files to register logging modules like I have for the test suites.