add build option to reuse a previous precompile statement file #30746
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Often, regenerating all precompile statements from scratch is not needed and kind of annoying. During print out of the timing stats for precompile generation, e.g.:
the "overhead" time is the time spent running everything that generates the statements. The rest of the time is actually including them, which is typically significantly shorter.
This PR saves the precompile statements from a build in a persistent file and one can with a setting in
Make.user
(JULIA_REUSE_PRECOMPILE=1
) chose to use that existing file instead of regenerating a new one. If using the old precompile file fails, a new one will be generated. So reusing the previous one is a bit quicker: