* Bugs fixed:
+ - The user is no longer allowed to override the --srcdir nor the --prefix
+ configure options used by "make distcheck" (bug#14991).
+
- Fixed a gross inefficiency in the recipes for installing byte-compiled
python files, that was causing an O(N^2) performance on the number N of
files, instead of the expected O(N) performance. Note that this bug
@file{Makefile.am}. The user can still extend or override the flags
provided there by defining the @code{DISTCHECK_CONFIGURE_FLAGS} variable,
on the command line when invoking @command{make}.
-
-Still, developers are encouraged to strive to make their code buildable
-without requiring any special configure option; thus, in general, you
-shouldn't define @code{AM_DISTCHECK_CONFIGURE_FLAGS}. However, there
-might be few scenarios in which the use of this variable is justified.
+@c See automake bug#14991 for more details about how the following holds.
+It's worth nothing that @command{make distcheck} needs complete control
+over the @command{configure} options @option{--srcdir} and
+@option{--prefix}, so those options cannot be overridden by
+@code{AM_DISTCHECK_CONFIGURE_FLAGS} nor by
+@code{DISTCHECK_CONFIGURE_FLAGS}.
+
+Also note that developers are encouraged to strive to make their code
+buildable without requiring any special configure option; thus, in
+general, you shouldn't define @code{AM_DISTCHECK_CONFIGURE_FLAGS}.
+However, there might be few scenarios in which the use of this variable
+is justified.
GNU @command{m4} offers an example. GNU @command{m4} configures by
default with its experimental and seldom used "changeword" feature
disabled; so in its case it is useful to have @command{make distcheck}
## so be sure to 'cd' back to the original directory after this.
&& am__cwd=`pwd` \
&& $(am__cd) $(distdir)/_build \
- && ../configure --srcdir=.. --prefix="$$dc_install_base" \
+ && ../configure \
?GETTEXT? --with-included-gettext \
-## Additional flags for configure. Keep this last in the configure
-## invocation so the developer and user can override previous options,
-## and let the user's flags take precedence over the developer's ones.
+## Additional flags for configure.
$(AM_DISTCHECK_CONFIGURE_FLAGS) \
$(DISTCHECK_CONFIGURE_FLAGS) \
+## At the moment, the code doesn't actually support changes in these --srcdir
+## and --prefix values, so don't allow them to be overridden by the user or
+## the developer. That used to be allowed, and caused issues in practice
+## (in corner-case usages); see automake bug#14991.
+ --srcdir=.. --prefix="$$dc_install_base" \
&& $(MAKE) $(AM_MAKEFLAGS) \
&& $(MAKE) $(AM_MAKEFLAGS) dvi \
&& $(MAKE) $(AM_MAKEFLAGS) check \
t/override-conditional-2.sh \
t/override-conditional-pr13940.sh \
t/dist-pr109765.sh \
-t/distcheck-no-prefix-or-srcdir-override.sh \
t/instdir-cond2.sh \
t/java-nobase.sh \
t/objext-pr10128.sh \