Trying to package bison 3.8/.1 for Cygwin - previous releases to 3.7.6 built and checked okay - bison 3.8.1 checked okay on 32 bit - all tests segv on 64 bit!

Reran build and check with bison 3.8 and 3.8.1 using gcc 10.2.0 and 11.2.0 with no change in all tests segv @ 0x0000000100000000.

Build runs with autoreconf et al as per normal on 32 and 64 bit; adding debug output allowed me see test commands to narrow down cause.

Ran using gdb against tests/c/bistromathic/parse.y (see attached for gdb command, script, and full log) getting the output below.

It appears to be possible that `gl_lock_lock` expansion to `pthread_in_use() ? pthread_mutex_lock(...)` -> glthread_in_use() ? ...` has avoided defining the latter in the build, or some underlying dynamic library function may not be loaded?

Thread 1 "bison" hit Breakpoint 10, block_fatal_signals () at /usr/src/debug/bison-3.8.1-1/lib/fatal-signal.c:318
318       if (mt) gl_lock_lock (fatal_signals_block_lock);
Continuing.

Thread 1 "bison" received signal SIGSEGV, Segmentation fault.
0x0000000100000000 in ?? ()
#0  0x0000000100000000 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)