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* doc/make.texi (Remaking Makefiles): [SV 61623] Add optimization

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Dmitry Goncharov 2022-08-03 00:22:48 -04:00 committed by Paul Smith
parent c72e1ec446
commit 6faa02247e
1 changed files with 15 additions and 1 deletions
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doc/make.texi
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@ -1399,11 +1399,25 @@ makefile and restart, and never do anything else. So, to avoid this,
@code{make} will @strong{not} attempt to remake makefiles which are specified
as targets of a double-colon rule with a recipe but no prerequisites.
Phony targets (@pxref{Phony Targets}) have the same issue: they are never
Phony targets (@pxref{Phony Targets}) have the same effect: they are never
considered up-to-date and so an included file marked as phony would cause
@code{make} to restart continuously. To avoid this @code{make} will not
attempt to remake makefiles which are marked phony.
You can take advantage of this to optimize startup time: if you know you don't
need your @file{Makefile} to be remade you can prevent make from trying to
remake it by adding either:
@example
.PHONY: Makefile
@end example
or:
@example
Makefile:: ;
@end example
If you do not specify any makefiles to be read with @samp{-f} or
@samp{--file} options, @code{make} will try the default makefile names;
@pxref{Makefile Names, ,What Name to Give Your Makefile}. Unlike