bug#39118: Segfault while building on 64-bit Cygwin

Both Cygwin and MacOS crash in pretty much the same way.  By disabling the
JIT, I was able to get the Cygwin build to run to completion.  On MacOS
with --disable-jit, however, I am now getting an entirely new failure:

  CC       readline.lo
readline.c:432:7: warning: implicitly declaring library function 'strncmp'
with type 'int (const char *, const char *,
      unsigned long)' [-Wimplicit-function-declaration]
  if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
      ^
readline.c:432:7: note: include the header <string.h> or explicitly provide
a declaration for 'strncmp'
readline.c:432:16: warning: implicit declaration of function
'rl_get_keymap_name' is invalid in C99
      [-Wimplicit-function-declaration]
  if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
               ^
readline.c:432:16: warning: incompatible integer to pointer conversion
passing 'int' to parameter of type 'const char *'
      [-Wint-conversion]
  if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 warnings generated.
  CCLD     guile-readline.la
Undefined symbols for architecture x86_64:
  "_rl_get_keymap_name", referenced from:
      _scm_init_readline in readline.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)

On Thu, Jan 23, 2020 at 3:35 PM Ludovic Courtès <[email protected]> wrote:

> Hi,
>
> John Cowan <[email protected]> skribis:
>
> > Thanks.  Unfortunately, the standard recipe for making core dumps on Mac
>
> This bug report is about Cygwin, not macOS, right?  :-)
>
> Ludo’.
>