Add support for the QNX operating system.

src/checks.cc

Index: src/checks.cc
diff --git a/src/checks.cc b/src/checks.cc
index a4514bf965094891cfb371ea46c05a6b1d26f05d..2b1c76cb9b1bc35b7ef19288bf6daee662d03c64 100644
--- a/src/checks.cc
+++ b/src/checks.cc
@@ -30,6 +30,8 @@
 #if V8_LIBC_GLIBC || V8_OS_BSD
 # include <cxxabi.h>
 # include <execinfo.h>
+#elif V8_OS_QNX
+# include <backtrace.h>
 #endif  // V8_LIBC_GLIBC || V8_OS_BSD
 #include <stdio.h>
 
@@ -64,6 +66,26 @@ static V8_INLINE void DumpBacktrace() {
     }
   }
   free(symbols);
+#elif V8_OS_QNX
+  char out[1024];
+  bt_accessor_t acc;
+  bt_memmap_t memmap;
+  bt_init_accessor(&acc, BT_SELF);
+  bt_load_memmap(&acc, &memmap);
+  bt_sprn_memmap(&memmap, out, sizeof(out));
+  i::OS::PrintError(out);
+  bt_addr_t trace[100];
+  int size = bt_get_backtrace(&acc, trace, ARRAY_SIZE(trace));
+  i::OS::PrintError("\n==== C stack trace ===============================\n\n");
+  if (size == 0) {
+    i::OS::PrintError("(empty)\n");
+  } else {
+    bt_sprnf_addrs(&memmap, trace, size, const_cast<char*>("%a\n"),
+                   out, sizeof(out), NULL);
+    i::OS::PrintError(out);
+  }
+  bt_unload_memmap(&memmap);
+  bt_release_accessor(&acc);
 #endif  // V8_LIBC_GLIBC || V8_OS_BSD
 }