Hello,
On Tue, Oct 18, 2005 at 01:24:14PM +0200, Ralf Wildenhues wrote:
> > Please hold back the AM_SUBST_IGNORE until multiline substitutions in
> > Automake are solved.
>
> I don't see why the solution to the problem of not substituting certain
> variables is dependent on the problem of how to handle multiline
> substitutions?
I wrote an answer yesterday, but by mistake I posted it to Ralf only.
In short, I'm not sure that the feature is necessary.
Ralf wrote me a very nice explanation, which convinced me.
In short, it is needed as the solution for PR/477.
Perhaps you could post the explanation here, Ralf?
I still think it should be implemented in Autoconf, see the patch below.
Would you like it this way? If yes, I'll finish the patch and submit it
to autoconf-patches.
(A nice side effect: AC_SUBST_NOTRACE would work even if used with
previous versions of Automake.)
Have a nice day,
Stepan Kasal
Index: lib/autoconf/general.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/general.m4,v
retrieving revision 1.886
diff -u -r1.886 general.m4
--- lib/autoconf/general.m4 19 Oct 2005 05:21:23 -0000 1.886
+++ lib/autoconf/general.m4 19 Oct 2005 05:27:20 -0000
@@ -1962,7 +1962,17 @@
#
m4_define([AC_SUBST],
[AC_SUBST_TRACE([$1])dnl
-m4_pattern_allow([^$1$])dnl
+AC_SUBST_NOTRACE($@)dnl
+])
+
+
+# AC_SUBST_NOTRACE(VARIABLE, [VALUE])
+# -----------------------------------
+# Like AC_SUBST, but without the call to AC_SUBST_TRACE. This implies
+# that this variable is not propagated to Automake-generated makefiles.
+#
+m4_define([AC_SUBST_NOTRACE],
+[m4_pattern_allow([^$1$])dnl
m4_ifvaln([$2], [$1=$2])[]dnl
m4_append_uniq([_AC_SUBST_VARS], [$1], [
])dnl
@@ -1971,7 +1981,7 @@
# AC_SUBST_FILE(VARIABLE)
# -----------------------
-# Read the comments of the preceding macro.
+# Read the comments of AC_SUBST.
m4_define([AC_SUBST_FILE],
[m4_pattern_allow([^$1$])dnl
m4_append_uniq([_AC_SUBST_FILES], [$1], [
