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Reset GNUMAKEFLAGS after parsing.

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If we don't do this we'll continually add flags on recursion.  This
is mainly for users to set in their environment before invoking make.
This commit is contained in:
Paul Smith
2013-09-29 13:15:00 -04:00
parent e8122ecb5d
commit 543521cd47
6 changed files with 52 additions and 8 deletions
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15
doc/make.texi
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@@ -4808,10 +4808,17 @@ to GNU @code{make}, and hence do not want to add GNU
@code{make}-specific flags to the @code{MAKEFLAGS} variable, you can
add them to the @code{GNUMAKEFLAGS} variable instead. This variable
is parsed just before @code{MAKEFLAGS}, in the same way as
@code{MAKEFLAGS}. Note, however, that when @code{make} constructs
@code{MAKEFLAGS} to pass to a recursive @code{make} it will include
all flags. GNU @code{make} never sets the @code{GNUMAKEFLAGS}
variable itself.
@code{MAKEFLAGS}. When @code{make} constructs @code{MAKEFLAGS} to
pass to a recursive @code{make} it will include all flags, even those
taken from @code{GNUMAKEFLAGS}. As a result, after parsing
@code{GNUMAKEFLAGS} GNU @code{make} sets this variable to the empty
string to avoid duplicating flags during recursion.
It's best to use @code{GNUMAKEFLAGS} only with flags which won't
materially change the behavior of your makefiles. If your makefiles
require GNU make anyway then simply use @code{MAKEFLAGS}. Flags such
as @samp{--no-print-directory} or @samp{--output-sync} may be
appropriate for @code{GNUMAKEFLAGS}.
@node -w Option, , Options/Recursion, Recursion
@subsection The @samp{--print-directory} Option