m4 ChangeLog doc/m4.texinfo modules/gnu.c

[Eric Blake]

CVSROOT:        /sources/m4
Module name:    m4
Changes by:     Eric Blake <ericb>      07/10/09 20:10:46

Modified files:
        .              : ChangeLog 
        doc            : m4.texinfo 
        modules        : gnu.c 

Log message:
        Fix regexp regression of 2007-09-29.
        
        * modules/gnu.c (substitute): Allow NULL buf when no
        subexpressions were present.
        (regexp): Handle \ escapes even with empty regex.
        * doc/m4.texinfo (Regexp, Patsubst): Catch this bug.
        
        Signed-off-by: Eric Blake <address@hidden>

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/m4/ChangeLog?cvsroot=m4&r1=1.553&r2=1.554
http://cvs.savannah.gnu.org/viewcvs/m4/doc/m4.texinfo?cvsroot=m4&r1=1.113&r2=1.114
http://cvs.savannah.gnu.org/viewcvs/m4/modules/gnu.c?cvsroot=m4&r1=1.77&r2=1.78