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Roland McGrath 1992-03-11 19:56:18 +00:00
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@ -19,8 +19,8 @@ automatically which pieces of a large program need to be recompiled,
and issues the commands to recompile them.
@c !!set edition, date, version
This is Edition 0.31 Beta, last updated 9 March 1991,
of @cite{The GNU Make Manual}, for @code{make}, Version 3.61 Beta.
This is Edition 0.32 Beta, last updated 11 March 1991,
of @cite{The GNU Make Manual}, for @code{make}, Version 3.63 Beta.
Copyright (C) 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
@ -53,7 +53,7 @@ by the Foundation.
@titlepage
@title GNU Make
@subtitle A Program for Directing Recompilation
@subtitle Edition 0.31 Beta, for @code{make} Version 3.61 Beta.
@subtitle Edition 0.32 Beta, for @code{make} Version 3.63 Beta.
@subtitle March 1992
@author by Richard M. Stallman and Roland McGrath
@page
@ -93,9 +93,9 @@ The GNU @code{make} utility automatically determines which pieces of a
large program need to be recompiled, and issues the commands to
recompile them.@refill
This is Edition 0.31 Beta of the @cite{GNU Make Manual},
last updated 9 March 1992,
for @code{make} Version 3.61 Beta.@refill
This is Edition 0.32 Beta of the @cite{GNU Make Manual},
last updated 11 March 1992,
for @code{make} Version 3.63 Beta.@refill
This manual describes @code{make} and contains the following chapters:@refill
@end ifinfo
@ -1798,10 +1798,11 @@ Rules, , Old-Fashioned Suffix Rules}.
@item .DEFAULT
The commands specified for @code{.DEFAULT} are used for any target for
which no other commands are known (either explicitly or through an
implicit rule). If @code{.DEFAULT} commands are specified, every
nonexistent file mentioned as a dependency will have these commands
executed on its behalf. @xref{Search Algorithm, ,Implicit Rule Search Algorithm}.
which no rules are found (either explicit rules or implicit rules). If
@code{.DEFAULT} commands are specified, every file mentioned as a
dependency, but not as a target in a rule, will have these commands
executed on its behalf. @xref{Search Algorithm, ,Implicit Rule Search
Algorithm}.
@item .PRECIOUS
@cindex precious targets
@ -5679,18 +5680,18 @@ would cancel the rule that runs the assembler:
@node Last Resort, Suffix Rules, Pattern Rules, Implicit Rules
@section Defining Last-Resort Default Rules
@findex .DEFAULT
You can define a last-resort implicit rule by writing a rule for the target
@code{.DEFAULT}. Such a rule's commands are used for all targets and
dependencies that have no commands of their own and for which no other
implicit rule applies. Naturally, there is no @code{.DEFAULT} rule unless
you write one.
You can define a last-resort implicit rule by writing a terminal
match-anything pattern rule with no dependencies (@pxref{Match-Anything
Rules}). This is just like any other pattern rule; the only thing
special about it is that it will match any target. So such a rule's
commands are used for all targets and dependencies that have no commands
of their own and for which no other implicit rule applies.
For example, when testing a makefile, you might not care if the source
files contain real data, only that they exist. Then you might do this:
@example
.DEFAULT:
%::
touch $@@
@end example
@ -5698,6 +5699,14 @@ files contain real data, only that they exist. Then you might do this:
to cause all the source files needed (as dependencies) to be created
automatically.
@findex .DEFAULT
You can instead define commands to be used for targets for which there
are no rules at all, even ones which don't specify commands. You do
this by writing a rule for the target @code{.DEFAULT}. Such a rule's
commands are used for all dependencies which do not appear as targets in
any explicit rule, and for which no implicit rule applies. Naturally,
there is no @code{.DEFAULT} rule unless you write one.
If you give @code{.DEFAULT} with no commands or dependencies:
@example
@ -5708,10 +5717,10 @@ If you give @code{.DEFAULT} with no commands or dependencies:
the commands previously stored for @code{.DEFAULT} are cleared.
Then @code{make} acts as if you had never defined @code{.DEFAULT} at all.
If you do not want a target to get the commands from @code{.DEFAULT}, but
you also
do not want any commands to be run for the target, you can give it empty
commands. @xref{Empty Commands, ,Defining Empty Commands}.
If you do not want a target to get the commands from a match-anything
pattern rule or @code{.DEFAULT}, but you also do not want any commands
to be run for the target, you can give it empty commands. @xref{Empty
Commands, ,Defining Empty Commands}.@refill
@node Suffix Rules, Search Algorithm, Last Resort, Implicit Rules
@section Old-Fashioned Suffix Rules