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Why do GCC error messages include ugly characters?

April 26, 2017characters Error gcc Messages ugly

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Why do GCC error messages include ugly characters?

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Linux distributions now often set the locale to UTF-8 by, for example, setting LANG=en_US.UTF-8. gcc takes this as an indication that it can use any Unicode character encoded as UTF-8 so quotes using ‘these’ rather than ASCII. To see these as intended, set output.code.