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How a diagnostic is identified (C90 3.7, C99 3.10, C90 and C99 220.127.116.11).
Diagnostics consist of all the output sent to stderr by GCC.
Whether each nonempty sequence of white-space characters other than
new-line is retained or replaced by one space character in translation
phase 3 (C90 and C99 18.104.22.168).
See (cpp)Implementation-defined behavior section `Implementation-defined behavior' in The C Preprocessor.