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Formerly make.texinfo.~115~

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Roland McGrath 1993-08-01 22:32:20 +00:00
parent cbeeeafde9
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make.texinfo
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@ -7,10 +7,10 @@
@c For publication, format makebook.texi instead of using this file directly.
@set EDITION 0.43
@set VERSION 3.68 Beta
@set UPDATED 26 July 1993
@set UPDATE-MONTH July 1993
@set EDITION 0.44
@set VERSION 3.69 Beta
@set UPDATED 1 August 1993
@set UPDATE-MONTH August 1993
@c finalout
@ -3271,12 +3271,11 @@ are not put into @code{MAKEFLAGS}; these options are not passed down.@refill
@cindex @code{--jobs}, and recursion
@cindex recursion, and @code{-j}
@cindex job slots, and recursion
The @samp{-j} option is a special case
(@pxref{Parallel, ,Parallel Execution}). If you set
it to some numeric value, @samp{-j 1} is always put into
The @samp{-j} option is a special case (@pxref{Parallel, ,Parallel Execution}).
If you set it to some numeric value, @samp{-j 1} is always put into
@code{MAKEFLAGS} instead of the value you specified. This is because if
the @w{@samp{-j}} option were passed down to sub-@code{make}s, you would get
many more jobs running in parallel than you asked for. If you give
the @w{@samp{-j}} option were passed down to sub-@code{make}s, you would
get many more jobs running in parallel than you asked for. If you give
@samp{-j} with no numeric argument, meaning to run as many jobs as
possible in parallel, this is passed down, since multiple infinities are
no more than one.@refill
@ -3299,8 +3298,10 @@ subsystem:
@vindex MFLAGS
A similar variable @code{MFLAGS} exists also, for historical compatibility.
It has the same value as @code{MAKEFLAGS} except that a hyphen is added at
the beginning if it is not empty. @code{MFLAGS} was traditionally used
It has the same value as @code{MAKEFLAGS} except that it always begins with
a hyphen unless it is empty (@code{MAKEFLAGS} begins with a hyphen only when
it begins with an option that has no single-letter version, such as
@samp{--warn-undefined-variables}). @code{MFLAGS} was traditionally used
explicitly in the recursive @code{make} command, like this:
@example
@ -3316,12 +3317,19 @@ but now @code{MAKEFLAGS} makes this usage redundant.
@cindex setting options in makefiles
@cindex options, setting in makefiles
The @code{MAKEFLAGS} and @code{MFLAGS} variables can also be useful if you
want to have certain options, such as @samp{-k}
(@pxref{Options Summary, ,Summary of Options})
set each time you run @code{make}. Just put @samp{MAKEFLAGS=k} or
@w{@samp{MFLAGS=-k}} in your environment. These variables may also be
set in makefiles, so a makefile can specify additional flags that should
also be in effect for that makefile.@refill
want to have certain options, such as @samp{-k} (@pxref{Options Summary,
,Summary of Options}), set each time you run @code{make}. You simply put a
value for @code{MAKEFLAGS} or @code{MFLAGS} in your environment. These
variables may also be set in makefiles, so a makefile can specify additional
flags that should also be in effect for that makefile.
When @code{make} interprets the value of @code{MAKEFLAGS} or @code{MFLAGS}
(either from the environment or from a makefile), it first prepends a hyphen
if the value does not already begin with one. Then it chops the value into
words separated by blanks, and parses these words as if they were options
given on the command line (except that @samp{-C}, @samp{-f}, @samp{-h},
@samp{-o}, @samp{-W}, and their long-named versions are ignored; and there
is no error for an invalid option).
If you do put @code{MAKEFLAGS} or @code{MFLAGS} in your environment, you
should be sure not to include any options that will drastically affect