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])],

[*-cygwin*], [

AS_IF([test "x$ac_cv_func_sigaltstack" = xno], [

AC_CACHE_CHECK(for CaptureStackBackTrace, rb_cv_have_CaptureStackBackTrace, [

AC_LINK_IFELSE([AC_LANG_SOURCE([[

#include <windows.h>

#define TRACE_SIZE 256

void *trace[TRACE_SIZE];

int

main()

{

CaptureStackBackTrace(0, TRACE_SIZE, trace, NULL);

return 0;

}

]])],

rb_cv_have_CaptureStackBackTrace=yes,

rb_cv_have_CaptureStackBackTrace=no)

])

AS_IF([test "$rb_cv_have_CaptureStackBackTrace" = yes], [

AC_DEFINE(HAVE_CAPTURESTACKBACKTRACE, 1)

])])])

++ b/vm_dump.c

#elif defined(__CYGWIN__) && defined(HAVE_CAPTURESTACKBACKTRACE) && \

defined(USE_LIBBACKTRACE)

# define HAVE_BACKTRACE 1

# include <windows.h>

# undef backtrace

# define backtrace(buffer, size) CaptureStackBackTrace(0, size, buffer, NULL)