diff -Nrup a/thirdparty/libbacktrace/btest.c b/thirdparty/libbacktrace/btest.c

--- a/thirdparty/libbacktrace/btest.c	2019-07-03 06:46:05.000000000 -0600

+++ b/thirdparty/libbacktrace/btest.c	2019-10-17 15:49:18.326666643 -0600

@@ -277,9 +277,9 @@ error_callback_three (void *vdata, const

 /* Test the backtrace function with non-inlined functions.  */

-static int test1 (void) __attribute__ ((noinline, unused));

-static int f2 (int) __attribute__ ((noinline));

-static int f3 (int, int) __attribute__ ((noinline));

+static int test1 (void) __attribute__ ((noinline, noclone, unused));

+static int f2 (int) __attribute__ ((noinline, noclone));

+static int f3 (int, int) __attribute__ ((noinline, noclone));

 static int

 test1 (void)

@@ -391,9 +391,9 @@ f13 (int f1line, int f2line)

 /* Test the backtrace_simple function with non-inlined functions.  */

-static int test3 (void) __attribute__ ((noinline, unused));

-static int f22 (int) __attribute__ ((noinline));

-static int f23 (int, int) __attribute__ ((noinline));

+static int test3 (void) __attribute__ ((noinline, noclone, unused));

+static int f22 (int) __attribute__ ((noinline, noclone));

+static int f23 (int, int) __attribute__ ((noinline, noclone));

 static int

 test3 (void)