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bug#51727: add an optional flag to -P to disable JIT

From: Paul Eggert
Subject: bug#51727: add an optional flag to -P to disable JIT
Date: Tue, 9 Nov 2021 16:40:56 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

On 11/9/21 11:04, Carlo Marcelo Arenas Belón wrote:
Severity: wishlist

There are times, when the expression is too simple or will not be used too
often to justify the extra time in -P that is required for JIT compilation.

How much extra time are we talking about? I would expect users would bother thinking about this flag only when it significantly helps performance, which sorta implies large inputs, which means the expression will be used often, which means users won't want to use nojit.

Anyway, if we do this sort of thing I suggest waiting for PCRE2 and doing it then. Also, our flags should use the same spelling as PCRE2 (which suggests that we use 'no-jit' rather than 'nojit'). And what other PCRE2 flags might users want to specify?

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