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Add compiler warning for preprocessor replacement within integer literals #3

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rcgoodfellow opened this issue Jun 24, 2022 · 0 comments
Open

Add compiler warning for preprocessor replacement within integer literals #3

rcgoodfellow opened this issue Jun 24, 2022 · 0 comments
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rcgoodfellow commented Jun 24, 2022 •
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From this Stack Overflow thread

Similar considerations mean that _ can't be used either; if there is a #define _234 * 2, then a[1_234] would silently change the meaning of the code.

As _ is the integer literal separator in p4, this silent code modification could sneak up and bite someone. We should detect and emit a warning here.
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