On Wed, Feb 6, 2019 at 4:49 PM Eric Blake <ebl...@redhat.com> wrote: > > On 2/6/19 4:18 PM, Peng Yu wrote: > > Hi, > > > > I deleted the file parser-built, and bash still compiles and an empty > > parser-built file will be generated upon compilation. What is the > > purpose of this file? Should it be deleted? Thanks.
> parser-built is a witness that $(YACC) was run, even if the timestamps > did not change (because the generated file did not change compared to > last time). It exists in the file system so as to let make compute > timestamp dependencies where we know the parser is up-to-date, even > though the actual file we depend on has a timestamp that does NOT change > (because we intentionally don't override it when there is no > difference), all in order to minimize the time spent rebuilding the > project when making a tweak to parse.y (for example, being able to tell > the difference between a minor edit that changes a comment but not the > generated parser, vs. a major edit that requires rebuilding other files > to pick up the changes implied by the changed parser). I don't get the point. Should parser-built be deleted? If bash can be compiled without it, why put it in the source tar.gz file? -- Regards, Peng
