Bootstrap error with ss2000-07-03, i386-unknown-openbsd

[Marc Espie]

stage2/xgcc -Bstage2/ -B/usr/local/i386-unknown-openbsd2.7/bin/  -DIN_GCC   -W -Wall -Wtraditional -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long -O2 -O2 -g   -DHAVE_CONFIG_H  -o gengenrtl  gengenrtl.o ` case "obstack.o" in ?*) echo obstack.o ;; esac ` ` case "" in ?*) echo  ;; esac ` ` case "" in ?*) echo  ;; esac `   ` case "" in ?*) echo  ;; esac ` ` case "" in ?*) echo  ;; esac ` 
./gengenrtl -h >tmp-genrtl.h
Memory fault (core dumped)
*** Error code 139
Starting it up with gdb says:
Program received signal SIGSEGV, Segmentation fault.
0x4006f644 in strchr ()
(gdb) where
#0  0x4006f644 in strchr ()
#1  0x0 in ?? ()

which is not much more informative.
Poking around reveal it breaks within find_formats()