Replace BISON_PROG_GNU_M4 with Autoconf's AC_PROG_GNU_M4.

[bison.git] / ChangeLog

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+2009-04-04  Joel E. Denny  <jdenny@ces.clemson.edu>
+
+       Replace BISON_PROG_GNU_M4 with Autoconf's AC_PROG_GNU_M4.
+       If the first m4 in $PATH is wrong, it keeps looking.  Moreover, its
+       requirements for a correct m4 are stricter.
+       * m4/m4.m4: Make it a symbolic link to submodules/autoconf/m4/m4.m4.
+       * configure.ac: Update to use AC_PROG_GNU_M4.
+       Reported by Eric Blake.
+
 2009-04-03  Joel E. Denny  <jdenny@ces.clemson.edu>
 
        Help with updating web manual.