1.4.18 fails under macOS

[Rainer J.H. Brandt]

Dear maintainers,

in https://lists.gnu.org/archive/html/bug-m4/2019-11/msg00005.html,
Vanessa McHale wrote that m4 built under macOS fails with "Abort trap: 6".
When I try that, I get "Abort" and a return code 134.
Here's a backtrace:

(lldb) run
Process 85082 launched: '/tmp/buildbot.57092/m4-1.4.18/src/m4' (x86_64)
Process 85082 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x00007fff68a25eb6 libsystem_kernel.dylib`__abort_with_payload + 
10
libsystem_kernel.dylib`__abort_with_payload:
->  0x7fff68a25eb6 <+10>: jae    0x7fff68a25ec0            ; <+20>
    0x7fff68a25eb8 <+12>: movq   %rax, %rdi
    0x7fff68a25ebb <+15>: jmp    0x7fff68a1dae9            ; cerror_nocancel
    0x7fff68a25ec0 <+20>: retq   
Target 0: (m4) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
  * frame #0: 0x00007fff68a25eb6 libsystem_kernel.dylib`__abort_with_payload + 
10
    frame #1: 0x00007fff68a202b8 
libsystem_kernel.dylib`abort_with_payload_wrapper_internal + 89
    frame #2: 0x00007fff68a202e5 libsystem_kernel.dylib`abort_with_payload + 9
    frame #3: 0x00007fff68936ecc libsystem_c.dylib`_os_crash_fmt + 182
    frame #4: 0x00007fff6896d8a8 libsystem_c.dylib`__vfprintf + 16526
    frame #5: 0x00007fff68992059 libsystem_c.dylib`__v2printf + 473
    frame #6: 0x00007fff6897734b libsystem_c.dylib`_vsnprintf + 415
    frame #7: 0x00007fff689773a8 libsystem_c.dylib`vsnprintf_l + 41
    frame #8: 0x00007fff68968318 libsystem_c.dylib`snprintf + 180
    frame #9: 0x000000010004638e m4`vasnprintf(resultbuf=0x0000000000000000, 
lengthp=0x00007ffeefbff418, format="internal error detected; please report this 
bug to <%s>", args=0x00007ffeefbff540) at vasnprintf.c:5077
    frame #10: 0x00000001000471e7 m4`rpl_vasprintf(resultp=0x00007ffeefbff460, 
format="internal error detected; please report this bug to <%s>", 
args=0x00007ffeefbff540) at vasprintf.c:36
    frame #11: 0x0000000100022d7a m4`xvasprintf(format="internal error 
detected; please report this bug to <%s>", args=0x00007ffeefbff540) at 
xvasprintf.c:102
    frame #12: 0x0000000100023110 m4`xasprintf(format=<unavailable>) at 
xasprintf.c:30 [opt]
    frame #13: 0x000000010000121e m4`main(argc=1, argv=0x00007ffeefbff6a8) at 
m4.c:398
    frame #14: 0x00007fff688d6015 libdyld.dylib`start + 1
    frame #15: 0x00007fff688d6015 libdyld.dylib`start + 1


I also tried to build and run older versions.  The last verrsion that works
for me is 1.4.11. With 1.4.12, the error occurs.

If there's anything else I can do please let me know.  I'm not subscribed
to the list.

Thank you,
Rainer

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