Bootrapping the gcc-3_2-branch using bison-1.50 is broken. Reverting back to bison-1.35 works. HEAD does work well using bison-1.50 cd /build/gcc/gcc-3.2-3.2.1ds3/src/gcc && \ if bison -o c-p$$.c c-parse.y; then \ test -f c-p$$.output && mv -f c-p$$.output c-parse.output ; \ mv -f c-p$$.c c-parse.c ; \ else \ rm -f c-p$$.* ; \ false ; \ fi c-parse.y:1432.2-1436.10: type clash (`' `ttype') on default action