Malcolm: 6 usability improvements in GCC 15

Date:
Thu, 10 Apr 2025 20:29:37 +0000

Description:
Over on the Red Hat Developer site, David Malcolm has an article
about improvements in GCC 15 , specifically focusing on the diagnostic information that the compiler emits. This includes ASCII art with a ""
warning emoji to display the execution path when it detects a problem (like
an infinite loop in one of his examples), better C++ template errors, machine-readable diagnostics using Static
Analysis Results Interchange Format (SARIF), better messages regarding
C23 compatibility since that is the default C version for GCC 15, and more. Since the changes are focused on messages, there is the inevitable color
scheme update as well: GCC will use color when emitting its text messages on stderr at a suitably modern terminal, using a few colors that seem to work well in a number of different terminal themesbut the exact rules for choosing which color to use for each aspect of the output have been rather arbitrary. For GCC 15, I've gone through C and C++'s errors, looking for places where
two different things in the source are being contrasted, such as type mismatches. These diagnostics now use color to visually highlight and distinguish the differences.

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Link to news story:
https://lwn.net/Articles/1017132/


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