[bug] segfault of bison 3.4 with gettext 0.20.1

[Juergen Daubert]

Hi,

the binary created from bison 3.4 with gettext 0.20.1 is broken and
segfaults already when called without any options. Works for me with 
gettext 0.19.8.1. See backtrace below.

best regards
Juergen



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Reading symbols from bison...done.
[New LWP 8893]
Core was generated by `./bison'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f16aaf900b6 in ?? () from /lib/libc.so.6
(gdb) bt full
#0  0x00007f16aaf900b6 in ?? () from /lib/libc.so.6
No symbol table info available.
#1  0x00007f16aaf30f26 in getenv () from /lib/libc.so.6
No symbol table info available.
#2  0x00007f16ab8c5974 in style_file_prepare () from /usr/lib/libtextstyle.so.0
No symbol table info available.
#3  0x000055d532712f4c in complain_init_color () at src/complain.c:258
        statbuf = {st_dev = 0, st_ino = 4294967295, st_nlink = 0, st_mode = 0, 
st_uid = 0, st_gid = 0, __pad0 = 0, st_rdev = 1095233372415, st_size = 0, 
          st_blksize = 0, st_blocks = 0, st_atim = {tv_sec = 0, tv_nsec = 0}, 
st_mtim = {tv_sec = 0, tv_nsec = 0}, st_ctim = {tv_sec = 0, tv_nsec = 0}, 
          __glibc_reserved = {0, 331, 94374163085904}}
#4  0x000055d532717985 in getargs_colors (argc=1, argv=0x7ffcbb7062c8) at 
src/getargs.c:612
No locals.
#5  0x000055d5327179c9 in getargs (argc=1, argv=0x7ffcbb7062c8) at 
src/getargs.c:619
        c = 0
#6  0x000055d5327211d3 in main (argc=1, argv=0x7ffcbb7062c8) at src/main.c:90
        generate = 171
(gdb) quit