If the edit distance between the two macros is more than 50%, DefinedMacro may not be header guard or can be header guard of another header file or it might be defining something completely different set by the build environment.
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and a '!defined(X)' if we find a broken header guard. This is suboptimal; we
should point the diagnostic at the 'X' token not the 'if' token, but it fixes
the crash.
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properly. This warning checks that the #ifndef and #define directives at
the beginning of a header refer to the same macro name. Includes a fix-it
hint to correct the header guard.
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Ismail Pazarbasi