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Formerly make.texinfo.~41~

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Roland McGrath 1992-08-14 18:47:05 +00:00
parent 30016eef42
commit 0c61dffcb5
1 changed files with 15 additions and 10 deletions
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@ -6,11 +6,10 @@
@smallbook
@c %**end of header
@set EDITION 0.34 Beta
@set EDITION 0.35 Beta
@set VERSION 3.63 Beta
@set UPDATED 23 July 1992
@c !!!!! is there a reason not to use the full date in the title page? -rm
@set UPDATE-MONTH July 1992
@set UPDATED 14 August 1992
@set UPDATE-MONTH August 1992
@c finalout
@ -1723,10 +1722,12 @@ clean:
@end group
@end example
A phony target should not be a dependency of a real target file; strange
things can result from that. As long as you do not do that, the phony
target commands will be executed only when the phony target is a specified
goal (@pxref{Goals, ,Arguments to Specify the Goals}).
A phony target should not be a dependency of a real target file; if it
is, its commands are run every time @code{make} goes to update that
file. As long as a phony target is never a dependency of a real
target, the phony target commands will be executed only when the phony
target is a specified goal (@pxref{Goals, ,Arguments to Specify the
Goals}).
Phony targets can have dependencies. When one directory contains multiple
programs, it is most convenient to describe all of the programs in one
@ -1792,8 +1793,12 @@ There is nothing special about the name @samp{FORCE}, but that is one name
commonly used this way.
As you can see, using @samp{FORCE} this way has the same results as using
@samp{.PHONY: clean}. The latter is more explicit, but other versions of
@code{make} do not support it; thus @samp{FORCE} appears in many makefiles.
@samp{.PHONY: clean}.
Using @samp{.PHONY} is more explicit, more efficient, and more secure,
since it protects against the file actually existing. However, other
versions of @code{make} do not support @samp{.PHONY}; thus
@samp{FORCE} appears in many makefiles. @xref{Phony Targets}.
@node Empty Targets, Special Targets, Force Targets, Rules
@section Empty Target Files to Record Events