3.1 bootstrap failure on irix6.5 - Unresolved text symbol "C_alloca"

[Billinghurst, David (CRTS)]

3.1 bootstrap on irix6.5 with cc dies with:

cc  -DIN_GCC    -g    -DHAVE_CONFIG_H -DGENERATOR_FILE  -o gencodes \
 gencodes.o rtl.o bitmap.o ggc-none.o gensupport.o hashtab.o safe-ctype.o
print-rtl.o errors.o ` case "obstack.o" in ?*) echo obstack.o ;; esac ` `
case "" in ?*) echo  ;; esac ` ` case "" in ?*) echo  ;; esac ` ` case "" in
?*) echo  ;; esac `
ld32: ERROR 33: Unresolved text symbol "C_alloca" -- 1st referenced by
bitmap.o.
        Use linker option -v to see when and which objects, archives and
dsos are loaded.