diff options
Diffstat (limited to 'make.texinfo')
| -rw-r--r-- | make.texinfo | 51 |
1 files changed, 30 insertions, 21 deletions
diff --git a/make.texinfo b/make.texinfo index f856fee..c9a620a 100644 --- a/make.texinfo +++ b/make.texinfo @@ -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 |