[SCM] GNU M4 source repository branch, branch-1.6, updated. v1.5.89a-44-gc9d53ab

[Eric Blake]

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- Log -----------------------------------------------------------------
commit c9d53ab9bcef0cb04d59f5797e6f20159150b75d
Author: Eric Blake <address@hidden>
Date:   Wed Jul 30 07:08:29 2008 -0600

    Fix regression in trace output, introduced 2008-05-09.
    
    * src/input.c (push_token): When cloning chains, break pointer
    back to original chain; latent bug from 2008-02-02 that did not
    cause misbehavior until trace output read unfinished chain.
    * doc/m4.texinfo (Trace): Add test for this.
    
    Signed-off-by: Eric Blake <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog      |    8 ++++++++
 doc/m4.texinfo |   16 ++++++++++++++++
 src/input.c    |    1 +
 3 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 47449f2..d4f182e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2008-07-30  Eric Blake  <address@hidden>
+
+       Fix regression in trace output, introduced 2008-05-09.
+       * src/input.c (push_token): When cloning chains, break pointer
+       back to original chain; latent bug from 2008-02-02 that did not
+       cause misbehavior until trace output read unfinished chain.
+       * doc/m4.texinfo (Trace): Add test for this.
+
 2008-07-28  Eric Blake  <address@hidden>
 
        Optimize iteration examples.
diff --git a/doc/m4.texinfo b/doc/m4.texinfo
index f8b3998..abacef9 100644
--- a/doc/m4.texinfo
+++ b/doc/m4.texinfo
@@ -3854,6 +3854,22 @@ indir(`my_defn', indir(`shift', `', `foo'))
 @result{}bar
 @end example
 
address@hidden
address@hidden not worth including in the manual, but this tests a trace code
address@hidden path that was temporarily broken
address@hidden options: -de --trace ifelse
address@hidden
+$ @kbd{m4 -de --trace ifelse}
+define(`e', `ifelse(`$1', `$2', `ifelse(`$1', `$2', `e(shift($@@))')')')
address@hidden
+e(`1', `1')
address@hidden: -1- ifelse -> ifelse(`1', `1', `e(shift(`1',`1'))')
address@hidden: -1- ifelse -> e(shift(`1',`1'))
address@hidden: -1- ifelse ->@w{ }
address@hidden
address@hidden example
address@hidden ignore
+
 @node Debug Levels
 @section Controlling debugging output
 
diff --git a/src/input.c b/src/input.c
index 18271cd..0d08215 100644
--- a/src/input.c
+++ b/src/input.c
@@ -472,6 +472,7 @@ push_token (token_data *token, int level, bool inuse)
             destructively modifies the chain it is parsing.  */
          chain = (token_chain *) obstack_copy (current_input, src_chain,
                                                sizeof *chain);
+         chain->next = NULL;
          if (chain->type == CHAIN_STR && chain->u.u_s.level == -1)
            {
              if (chain->u.u_s.len <= INPUT_INLINE_THRESHOLD || !inuse)


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