m4 ChangeLog NEWS doc/m4.texinfo src/builtin.c ... [branch]

[Eric Blake]

CVSROOT:        /sources/m4
Module name:    m4
Branch:         branch
Changes by:     Eric Blake <ericb>      06/06/06 12:28:46

Modified files:
        .              : ChangeLog NEWS 
        doc            : m4.texinfo 
        src            : builtin.c symtab.c 

Log message:
        Solve crash when passing "indir(`foo')" to "m4 -tfoo".
        * src/symtab.c (lookup_symbol) <SYMBOL_DELETE, SYMBOL_POPDEF>:
        Preserve placeholder when macro is being traced.
        * src/builtin.c (m4_ifdef, m4_indir): A traced but undefined
        symbol is not defined.
        (set_trace): Remove placeholder when no longer traced.
        (m4_traceon): On named traces, always reserve a slot in the
        symbol table.
        (m4_traceoff): Don't warn about untracing a nonexistent symbol.
        * NEWS: Document new trace behavior.
        * doc/m4.texinfo (Trace): Tracing by name now consistently works
        no matter whether that macro is currently defined.
        (Incompatibilities): Document differences between traditional and
        GNU trace.

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/m4/ChangeLog?cvsroot=m4&only_with_tag=branch&r1=1.1.1.1.2.52&r2=1.1.1.1.2.53
http://cvs.savannah.gnu.org/viewcvs/m4/NEWS?cvsroot=m4&only_with_tag=branch&r1=1.1.1.1.2.14&r2=1.1.1.1.2.15
http://cvs.savannah.gnu.org/viewcvs/m4/doc/m4.texinfo?cvsroot=m4&only_with_tag=branch&r1=1.1.1.1.2.15&r2=1.1.1.1.2.16
http://cvs.savannah.gnu.org/viewcvs/m4/src/builtin.c?cvsroot=m4&only_with_tag=branch&r1=1.1.1.1.2.5&r2=1.1.1.1.2.6
http://cvs.savannah.gnu.org/viewcvs/m4/src/symtab.c?cvsroot=m4&only_with_tag=branch&r1=1.1.1.1.2.4&r2=1.1.1.1.2.5