GNU Does Not Distinguish Between __thread and thread_local

Error Information

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error: thread-local declaration of 'test' with static initialization follows declaration with dynamic initialization
    3 |  __thread long test;
      |                ^
note: previous declaration is here
    1 |  extern thread_local long test;
      |                           ^

Problem

The __thread identifier is different from the thread_local identifier. The __thread identifier is for static initialization, and the thread_local identifier is for dynamic initialization. Therefore, they cannot be specified at the same time. GNU uses the following processing logic:

Solution

• Modify the statement based on the actual code requirements.
• Use the clang-tidy tool to identify such issues and provide modification suggestions.