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Flex size_t sizes

From: Hans Åberg
Subject: Flex size_t sizes
Date: Thu, 14 Oct 2021 15:23:43 +0200

Hi Akim,

Saw you have edited Flex, so I take it up here, even though not strictly a 
Bison topic:

The Apple flex version has been edited to admit size_t sizes, 64-bit on the 
platform, and perhaps it might be good idea for regular flex, which uses int, 
only 32-bit there. If using '%option c++' and mixing the versions, then the 
FlexLexer.h header is incompatible with the C++ source code, generating a 
compile error.

On MacOS with MacPorts and Xcode, the files are in

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