Support recovery from C stack overflow on MS-Windows

[gnu-emacs] / nt / inc / ms-w32.h

diff --git a/nt/inc/ms-w32.h b/nt/inc/ms-w32.h
index 4fb32df0c07d0de848ae9418262ef1441e27c9cb..e7a94e81c2d169170a4bdfcac3277dfe9a283c64 100644 (file)
--- a/nt/inc/ms-w32.h
+++ b/nt/inc/ms-w32.h
@@ -187,6 +187,20 @@ extern struct tm * sys_localtime (const time_t *);
 #undef HAVE__SETJMP
 #endif
 
+/* The following is needed for recovery from C stack overflows.  */
+#include <setjmp.h>
+typedef jmp_buf sigjmp_buf;
+#ifdef MINGW_W64
+/* Evidently, MinGW64's longjmp crashes when invoked from an exception
+   handler, see https://sourceforge.net/p/mingw-w64/mailman/message/32421953/.
+   This seems to be an unsolved problem in the MinGW64 runtime.  So we
+   use the GCC intrinsics instead.  FIXME.  */
+#define sigsetjmp(j,m) __builtin_setjmp(j)
+#else
+#define sigsetjmp(j,m) setjmp(j)
+#endif
+extern void w32_reset_stack_overflow_guard (void);
+
 #ifdef _MSC_VER
 #include <sys/timeb.h>
 #include <sys/stat.h>