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* cmCommandArgumentParserHelper: rework input handlingOleksandr Koval2020-09-091-1/+1
| | | | | | | | Old implementation uses involved Flex input management technique that requires usage of obsolete YY_INPUT macro. This causes a lot of useless allocations and byte-by-byte scanning. New implementation avoids those hacks, it uses yy_scan_string() API to setup Flex input. Also it fixes reporting of syntax error position and corresponding tests.
* CMP0053: document that `$` is a valid literal variable characterBen Boeckel2018-10-151-0/+24
This was overlooked in the initial implementation of CMP0053. However, an additional policy to reject it again is not worth it. Instead, add tests and document the behavior. Fixes: #17883