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Diffstat (limited to 'doc/make.texi')
| -rw-r--r-- | doc/make.texi | 35 |
1 files changed, 25 insertions, 10 deletions
diff --git a/doc/make.texi b/doc/make.texi index a8bc6a6..a81e8ba 100644 --- a/doc/make.texi +++ b/doc/make.texi @@ -38,7 +38,8 @@ and issues the commands to recompile them. This is Edition @value{EDITION}, last updated @value{UPDATED}, of @cite{The GNU Make Manual}, for @code{make}, Version @value{VERSION}. -Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003 +Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, +1998, 1999, 2000, 2002, 2003, 2004 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document @@ -57,11 +58,11 @@ Texts. A copy of the license is included in the section entitled @subtitle A Program for Directing Recompilation @subtitle GNU @code{make} Version @value{VERSION} @subtitle @value{UPDATE-MONTH} -@author Richard M. Stallman, Roland McGrath, Paul Smith +@author Richard M. Stallman, Roland McGrath, Paul D. Smith @page @vskip 0pt plus 1filll Copyright @copyright{} 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, -1996, 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc. +1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004 Free Software Foundation, Inc. @sp 2 Published by the Free Software Foundation @* 59 Temple Place -- Suite 330, @* @@ -350,7 +351,7 @@ The @code{make} utility automatically determines which pieces of a large program need to be recompiled, and issues commands to recompile them. This manual describes GNU @code{make}, which was implemented by Richard Stallman and Roland McGrath. Development since Version 3.76 has been -handled by Paul Smith. +handled by Paul D. Smith. GNU @code{make} conforms to section 6.2 of @cite{IEEE Standard 1003.2-1992} (POSIX.2). @@ -3675,7 +3676,11 @@ a rule alters the effects of the @samp{-t} (@samp{--touch}), @samp{-n} (@samp{--just-print}), or @samp{-q} (@w{@samp{--question}}) option. Using the @code{MAKE} variable has the same effect as using a @samp{+} character at the beginning of the command line. @xref{Instead of -Execution, ,Instead of Executing the Commands}.@refill +Execution, ,Instead of Executing the Commands}. This special feature +is only enabled if the @code{MAKE} variable appears directly in the +command script: it does not apply if the @code{MAKE} variable is +referenced through expansion of another variable. In the latter case +you must use the @samp{+} token to get these special effects.@refill Consider the command @samp{make -t} in the above example. (The @samp{-t} option marks targets as up to date without actually running @@ -5225,10 +5230,11 @@ environment if the @samp{-e} option is in force) will take precedence. Specifying the @code{override} directive will allow the target-specific variable value to be preferred. -There is one more special feature of target-specific variables: when you -define a target-specific variable, that variable value is also in effect -for all prerequisites of this target (unless those prerequisites override -it with their own target-specific variable value). So, for example, a +There is one more special feature of target-specific variables: when +you define a target-specific variable that variable value is also in +effect for all prerequisites of this target, and all their +prerequisites, etc. (unless those prerequisites override that variable +with their own target-specific variable value). So, for example, a statement like this: @example @@ -5240,7 +5246,16 @@ prog : prog.o foo.o bar.o will set @code{CFLAGS} to @samp{-g} in the command script for @file{prog}, but it will also set @code{CFLAGS} to @samp{-g} in the command scripts that create @file{prog.o}, @file{foo.o}, and -@file{bar.o}, and any command scripts which create their prerequisites. +@file{bar.o}, and any command scripts which create their +prerequisites. + +Be aware that a given prerequisite will only be built once per +invocation of make, at most. If the same file is a prerequisite of +multiple targets, and each of those targets has a different value for +the same target-specific variable, then the first target to be built +will cause that prerequisite to be built and the prerequisite will +inherit the target-specific value from the first target. It will +ignore the target-specific values from any other targets. @node Pattern-specific, , Target-specific, Using Variables @section Pattern-specific Variable Values |