GCC 15: Six Major Improvements to Compiler Diagnostics

A Red Hat engineer details six significant improvements to compiler diagnostics in GCC 15, aimed at enhancing usability. These include: prettier visualizations of execution paths using ASCII art and warning emojis; improved presentation of C++ template errors with nested structures for better readability; simultaneous output of text and SARIF diagnostic formats; a smoother transition to C23 with improved error messages highlighting C23 compatibility issues; a revamped color scheme using color to highlight differences in the source code; and the introduction of libgdiagnostics, a shared library making GCC's diagnostic functionality accessible to other projects. These improvements promise a significant boost to the developer experience with GCC.