possible fix for PR/315

Richard, is the code I'm destroying below very important?  I've
got the impression it was just a "bonus-optimization", but I
can't say I understand all the issues with conditional
combinatorial explosions and al.

Index: ChangeLog
--- ChangeLog
+++ ChangeLog
@@ -1,1 +1,12 @@
+2002-04-22  Alexandre Duret-Lutz  <duret_g@xxxxxxxx>
+
+       Fix PR automake/315:
+       * automake.in (subobjname): Always generate unique variable name,
+       even if this leads to duplication of objects.  The conditions
+       allowing the share object variable between target are hard to
+       compute at this point.
+       (%substnums): Remove.
+       * tests/Makefile.am (XFAIL_TESTS): Remove specflags8.test.
+       * tests/specflags8.test: Mention PR 315.
+

Index: automake.in
===================================================================
RCS file: /cvs/automake/automake/automake.in,v
retrieving revision 1.1292
diff -u -r1.1292 automake.in
--- automake.in 19 Apr 2002 20:53:56 -0000      1.1292
+++ automake.in 22 Apr 2002 20:30:14 -0000
@@ -599,11 +599,6 @@
 # force.
 my @substtos;
 
-# Associates a variable name, together with a list of substitutions to be
-# performed on it, with a number.  Used to provide unique names for generated
-# variables.
-my %substnums = ();
-
 # If a file name appears as a key in this hash, then it has already
 # been checked for.  This variable is local to the "require file"
 # functions.
@@ -2238,34 +2233,20 @@
 #   $VARNAME is the name of the variable the object variable is being
 #   generated from.
 #
-# This function also looks at @substfroms and @substtos to determine any
-# substitutions to be performed on the object variable.
+# This function returns unique names.
 #
-# The name returned is unique for the combination of $varname and
-# substitutions to be performed.
+# This is suboptimal, we only have to generate a name which is
+# unique for the combination of $VARNAME, substitutions performed
+# on $VARNAME, and uses in targets with per-target flags.
+# However this latter condition (is the variable used in such a target?)
+# is hard to evaluate at this point because we need to know each language
+# used (and for this we'd have to follow the suffix rules, for all possibly
+# compiled sources, etc.).
+my $subobjnamenum = 0;
 sub subobjname ($)
 {
-    my ($varname) = @_;
-    my $key = $varname;
-    my $substnum=$#substfroms;
-    while ($substnum >= 0)
-    {
-       if (defined $substfroms[$substnum] &&
-           ($substfroms[$substnum] || $substtos[$substnum]))
-       {
-           $key .= ":" . $substfroms[$substnum] . "=" . $substtos[$substnum];
-       }
-       $substnum -= 1;
-    }
-
-    my $num = $substnums{$key};
-    if (! $num)
-    {
-       $num = keys(%substnums) + 1;
-       $substnums{$key} = $num;
-    }
-
-    return "am__objects_$num";
+    ++$subobjnamenum;
+    return "am__objects_${subobjnamenum}";
 }
 
 
Index: tests/Makefile.am
===================================================================
RCS file: /cvs/automake/automake/tests/Makefile.am,v
retrieving revision 1.390
diff -u -r1.390 Makefile.am
--- tests/Makefile.am   19 Apr 2002 10:21:34 -0000      1.390
+++ tests/Makefile.am   22 Apr 2002 20:30:15 -0000
@@ -1,6 +1,6 @@
 ## Process this file with automake to create Makefile.in
 
-XFAIL_TESTS = condd.test subdir5.test auxdir2.test cond17.test specflags8.test
+XFAIL_TESTS = condd.test subdir5.test auxdir2.test cond17.test
 
 TESTS =        \
 acinclude.test \
Index: tests/Makefile.in
===================================================================
RCS file: /cvs/automake/automake/tests/Makefile.in,v
retrieving revision 1.506
diff -u -r1.506 Makefile.in
--- tests/Makefile.in   19 Apr 2002 10:21:34 -0000      1.506
+++ tests/Makefile.in   22 Apr 2002 20:30:16 -0000
@@ -84,7 +84,7 @@
 sysconfdir = @sysconfdir@
 target_alias = @target_alias@
 
-XFAIL_TESTS = condd.test subdir5.test auxdir2.test cond17.test specflags8.test
+XFAIL_TESTS = condd.test subdir5.test auxdir2.test cond17.test
 
 TESTS = \
 acinclude.test \
Index: tests/specflags8.test
===================================================================
RCS file: /cvs/automake/automake/tests/specflags8.test,v
retrieving revision 1.2
diff -u -r1.2 specflags8.test
--- tests/specflags8.test       2 Apr 2002 16:20:15 -0000       1.2
+++ tests/specflags8.test       22 Apr 2002 20:30:16 -0000
@@ -2,6 +2,7 @@
 
 # Like the ctags/etags example from the manual,
 # with one extra indirection in the sources.
+# PR 315.
 
 . $srcdir/defs || exit 1
 

-- 
Alexandre Duret-Lutz