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Roland McGrath 1992-05-04 22:47:45 +00:00
parent 2ebaa9f881
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@ -19,7 +19,7 @@ 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 0.33 Beta, last updated 3 May 1992,
This is Edition 0.33 Beta, last updated 4 May 1992,
of @cite{The GNU Make Manual}, for @code{make}, Version 3.63 Beta.
Copyright (C) 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
@ -94,7 +94,7 @@ large program need to be recompiled, and issues the commands to
recompile them.@refill
This is Edition 0.33 Beta of the @cite{GNU Make Manual},
last updated 3 May 1992,
last updated 4 May 1992,
for @code{make} Version 3.63 Beta.@refill
This manual describes @code{make} and contains the following chapters:@refill
@ -2491,10 +2491,10 @@ the sub-@code{make} as defaults, but do not override what is specified
in the sub-@code{make}'s makefile unless the @samp{-e} switch is used
(@pxref{Options Summary, ,Summary of Options}).@refill
By default, a variable is passed down if its name consists only of letters,
numbers and underscores. Some shells cannot cope with environment
variable names consisting of characters other than letters, numbers,
and underscores.
By default, a variable is only passed down if its name consists only of
letters, numbers and underscores. Some shells cannot cope with
environment variable names consisting of characters other than letters,
numbers, and underscores.
Variable are @emph{not} normally passed down if they were created by
default by @code{make} (@pxref{Implicit Variables, ,Variables Used by
@ -2550,6 +2550,31 @@ export @var{variable}
You may notice that the @code{export} and @code{unexport} directives
work in @code{make} just like they work in the shell, @code{sh}.
If you want all variables to be exported by default, you can use
@code{export} by itself:
@example
export
@end example
@noindent
This tells @code{make} that variables which are not explicitly mentioned
in an @code{export} or @code{unexport} directive should be exported.
Any variable given in an @code{unexport} directive will still @emph{not}
be exported. If you use @code{export} by itself to export variables by
default, variables whose names contain characters other than
alphanumerics and underscores will not be exported unless specifically
mentioned in an @code{export} directive.@refill
Likewise, you can use @code{unexport} by itself to tell @code{make}
@emph{not} to export variables by default. Since this is the default
behavior, you would only need to do this if @code{export} had been used
by itself earlier (in an included makefile, perhaps). You
@strong{cannot} use @code{export} and @code{unexport} by themselves to
have variables exported for some commands and not for others. The last
@code{export} or @code{unexport} directive that appears by itself
determines the behavior for the entire run of @code{make}.@refill
@vindex MAKELEVEL
As a special feature, the variable @code{MAKELEVEL} is changed when it
is passed down from level to level. This variable's value is a string