From d3089d5373c2d84623bbff1010da909a9db66497 Mon Sep 17 00:00:00 2001
From: Jared Beck <jared@jaredbeck.com>
Date: Sat, 12 Jul 2014 19:34:21 -0400
Subject: [PATCH] proof of concept for bug #10008

---
 configure.in | 58 +---------------------------------------------------------
 1 file changed, 1 insertion(+), 57 deletions(-)

diff --git a/configure.in b/configure.in
index 1a001e6..4dbc9a5 100644
--- a/configure.in
+++ b/configure.in
@@ -2830,63 +2830,7 @@ AS_CASE(["$target_cpu-$target_os"],
     fi])
 AC_CHECK_FUNCS(backtrace)
 
-if test "x$ac_cv_func_backtrace" = xyes; then
-  AC_CACHE_CHECK(for broken backtrace, rb_cv_broken_backtrace,
-    [AC_TRY_RUN([
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <string.h>
-#include <signal.h>
-#include <execinfo.h>
-
-#define TRACE_SIZE 256
-
-void sigsegv(int signum, siginfo_t *info, void *ctx){
-    void *trace[TRACE_SIZE];
-    int n = backtrace(trace, TRACE_SIZE);
-    if (n > 0) {
-	/*fprintf(stdout, "backtrace:%d\n",n);*/
-    } else {
-	abort();
-    }
-    _exit(0);
-}
-int
-main()
-{
-    stack_t ss;
-    ss.ss_sp = malloc(SIGSTKSZ);
-    if (ss.ss_sp == NULL) {
-	fprintf(stderr, "cannot allocate memory for sigaltstack\n");
-	abort();
-    }
-    ss.ss_size = SIGSTKSZ;
-    ss.ss_flags = 0;
-    if (sigaltstack(&ss, NULL) == -1) {
-	fprintf(stderr, "sigaltstack failed\n");
-	abort();
-    }
-    struct sigaction sa;
-    memset(&sa, 0, sizeof(struct sigaction));
-    sigemptyset(&sa.sa_mask);
-    sa.sa_sigaction = sigsegv;
-    sa.sa_flags |= SA_SIGINFO;
-    sa.sa_flags |= SA_ONSTACK;
-    sigaction(SIGSEGV, &sa, NULL);
-    int *a = NULL;
-    a[0] = 1;
-    return 0;
-}
-],
-	rb_cv_broken_backtrace=no,
-	rb_cv_broken_backtrace=yes,
-	rb_cv_broken_backtrace=no)])
-  if test "$rb_cv_broken_backtrace" = yes; then
-    AC_DEFINE(BROKEN_BACKTRACE, 1)
-  fi
-fi
+AC_DEFINE(BROKEN_BACKTRACE, 1)
 
 AC_ARG_WITH(valgrind,
         AS_HELP_STRING([--without-valgrind],[disable valgrind memcheck support]),
-- 
1.8.4.3