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2023-09-20 04:30:06

In the last few months, I have been a part of an ongoing effort to improve Clang’s diagnostic capabilities. The newly released Clang 17 brings several of these improvements to the forefront. This blog post aims to provide a comprehensive overview of these diagnostic enhancements. We will employ simplified code examples and compare diagnostic outputs from Clang 16 and Clang 17 to illustrate how the latest updates can enhance the development experience for Clang users.

One of the most anticipated diagnostic features of Clang 17 is its support for multi-line printing of code snippets. This marks a departure from the old single-line limit, which used to make it difficult to fully understand the context around a code issue. This new feature improves the readability and comprehensibility of diagnostic messages by displaying a more complete view of the code in question. Moreover, line numbers are now attached to the left of each line, allowing for quicker navigation and issue resolution.

Redefinition of compiler builtin macros usually leads to unintended results because library headers often rely on these macros, and they do not expect these macros to be modified by users.

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