diff -up gc-7.6.4/pthread_start.c.dont_disable_exceptions gc-7.6.4/pthread_start.c

--- gc-7.6.4/pthread_start.c.dont_disable_exceptions	2018-01-26 07:16:17.000000000 -0600

+++ gc-7.6.4/pthread_start.c	2018-03-14 09:21:34.263477197 -0500

@@ -22,7 +22,7 @@

 /* case at the top of the file.  FIXME: it's still unclear whether this */

 /* will actually cause the exit handler to be invoked last when         */

 /* thread_exit is called (and if -fexceptions is used).                 */

-#if defined(__GNUC__) && defined(__linux__)

+#if 0 && defined(__GNUC__) && defined(__linux__)

   /* We undefine __EXCEPTIONS to avoid using GCC __cleanup__ attribute. */

   /* The current NPTL implementation of pthread_cleanup_push uses       */

   /* __cleanup__ attribute when __EXCEPTIONS is defined (-fexceptions). */