Unable to use LOG_BACKEND_DEFINE macro from log_backend.h using C++

[glenne]

Describe the bug
When including log_backend.h from a C++ application, the following error is produced by the C++ compiler:

zephyr/include/logging/log_backend.h:81:2: error: designator order for field 'log_backend_control_block::id' does not match declaration order in 'log_backend_control_block'

To Reproduce
Steps to reproduce the behavior:

1. Add the following code to a C++ source file

#include <logging/log_backend.h> const struct log_backend_api my_backend_api = {}; LOG_BACKEND_DEFINE(my_backend, my_backend_api, true);
Expected behavior
A compilation error is not produced.

Impact
Annoyance. A workaround is to #undef the macro and redefine it with correct order of arguments.

Fix
The fix is to reverse the order of the .id and .active initialization lines in the LOG_BACKEND_DEFINE macro.

Environment (please complete the following information):

• OS: Fedora
• Toolchain Zephyr riscv SDK
• Commit SHA 4fea711

[glenne]

Fix is in pull request - #22483