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Document VPATH = $(variable) issue in VPATH chapter.

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* doc/autoconf.texi (Variables listed in VPATH): New node.
(Top, VPATH and Make): Adjust menus.
(Build Directories): Refer to it.
Prompted by report from Bruno Haible.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
This commit is contained in:
Ralf Wildenhues 2009-05-21 14:18:39 +02:00
parent 6382b687fd
commit 35e67f5c0d
2 changed files with 31 additions and 3 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2009-05-21 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
Document VPATH = $(variable) issue in VPATH chapter.
* doc/autoconf.texi (Variables listed in VPATH): New node.
(Top, VPATH and Make): Adjust menus.
(Build Directories): Refer to it.
Prompted by report from Bruno Haible.
2009-05-19 Eric Blake <ebb9@byu.net>
Update uses of all-permissive license.

26
doc/autoconf.texi
View File

@ -519,6 +519,7 @@ Portable Make Programming
@code{VPATH} and Make
* Variables listed in VPATH:: @code{VPATH} must be literal on ancient hosts
* VPATH and Double-colon:: Problems with @samp{::} on ancient hosts
* $< in Explicit Rules:: @code{$<} does not work in ordinary rules
* Automatic Rule Rewriting:: @code{VPATH} goes wild on Solaris
@ -2953,9 +2954,8 @@ srcdir = @@srcdir@@
VPATH = @@srcdir@@
@end example
Do not set @code{VPATH} to the value of another variable, for example
@samp{VPATH = $(srcdir)}, because some versions of @command{make} do not do
variable substitutions on the value of @code{VPATH}.
Do not set @code{VPATH} to the value of another variable (@pxref{Variables
listed in VPATH}.
@command{configure} substitutes the correct value for @code{srcdir} when
it produces @file{Makefile}.
@ -18028,6 +18028,7 @@ Here are some known issues with some @code{VPATH}
implementations.
@menu
* Variables listed in VPATH:: @code{VPATH} must be literal on ancient hosts
* VPATH and Double-colon:: Problems with @samp{::} on ancient hosts
* $< in Explicit Rules:: @code{$<} does not work in ordinary rules
* Automatic Rule Rewriting:: @code{VPATH} goes wild on Solaris
@ -18035,6 +18036,25 @@ implementations.
* Make Target Lookup:: More details about @code{VPATH} lookup
@end menu
@node Variables listed in VPATH
@subsection Variables listed in @code{VPATH}
@cindex @code{VPATH} and variables
@cindex variables and @code{VPATH}
Do not set @code{VPATH} to the value of another variable, for example
@samp{VPATH = $(srcdir)}, because some ancient versions of
@command{make} do not do variable substitutions on the value of
@code{VPATH}. For example, use this
@example
srcdir = @@srcdir@@
VPATH = @@srcdir@@
@end example
@noindent
rather than @samp{VPATH = $(srcdir)}. Note that with @acronym{GNU}
Automake, there is no need to set this yourself.
@node VPATH and Double-colon
@subsection @code{VPATH} and Double-colon Rules
@cindex @code{VPATH} and double-colon rules