doc: overriding targets doesn't mean third-party Makefiles.

Fixes automake bug https://bugs.gnu.org/60607.

* doc/automake.texi (dvi and distcheck): simply show
dvi: as an example of a do-nothing Makefile (xref to Extending),
instead of cross-referencing the complicated method in
Third-Party Makefiles.
(Clean, Extending): wording tweaks.

1 files changed, 18 insertions, 10 deletions

diff --git a/doc/automake.texi b/doc/automake.texi
index 813674214..58156d9bf 100644
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -8540,7 +8540,7 @@ be defined to specify additional files to clean.  These variables are
 @trindex maintainer-clean-local
 When cleaning involves more than deleting some hard-coded list of
 files, it is also possible to supplement the cleaning rules with your
-own commands.  Simply define a rule for any of the
+own commands: define a rule for any of the
 @code{mostlyclean-local}, @code{clean-local}, @code{distclean-local},
 or @code{maintainer-clean-local} targets (@pxref{Extending}).  A common
 case is deleting a directory, for instance, a directory created by the
@@ -8885,8 +8885,16 @@ example,
 AM_DISTCHECK_DVI_TARGET = pdf
 @end example
 
-To make @code{dvi} into a do-nothing target, see the example for
-@code{EMPTY_AUTOMAKE_TARGETS} in @ref{Third-Party Makefiles}.
+To make @code{dvi} into a do-nothing target, add it to your
+@file{Makefile.am} with no commands:
+
+@example
+dvi:
+@end example
+
+@noindent
+As usual with Automake, your user-defined target will override
+Automake's target (@pxref{Extending}).
 
 @trindex distcheck-hook
 @subheading distcheck-hook
@@ -11509,17 +11517,17 @@ As far as rules are concerned, a user-defined rule overrides any
 @cindex overriding semantics
 @cindex rules, overriding
 
-These overriding semantics make it possible to fine tune some default
+These overriding semantics make it possible to fine-tune some default
 settings of Automake, or replace some of its rules.  Overriding
 Automake rules is often inadvisable, particularly in the topmost
 directory of a package with subdirectories.  The @option{-Woverride}
-option (@pxref{automake Invocation}) comes in handy to catch overridden
-definitions.
+option (@pxref{automake Invocation}) comes in handy to catch definitions
+overridden by accident.
 
-Note that Automake does not make any distinction between rules with
-commands and rules that only specify dependencies.  So it is not
-possible to append new dependencies to an @command{automake}-defined
-target without redefining the entire rule.
+Automake does not make any distinction between rules with commands and
+rules that only specify dependencies.  So it is not possible to append
+new dependencies to an @command{automake}-defined target without
+redefining the entire rule.
 
 @cindex @option{-local} targets
 @cindex local targets