Index: compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.h
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.h
+++ compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.h
@@ -25,6 +25,9 @@
 extern uptr MainThreadStackBase, MainThreadStackSize;
 extern sanitizer_shadow_bounds_t ShadowBounds;
 
+// One frame in a backtrace (printed on a line by itself).
+constexpr const char *kFormatBacktraceFrame = "{{{bt:%u:%p}}}";
+
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_FUCHSIA
Index: compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_fuchsia.cc
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_fuchsia.cc
+++ compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_fuchsia.cc
@@ -13,9 +13,13 @@
 //===----------------------------------------------------------------------===//
 
 #include "sanitizer_platform.h"
-#if SANITIZER_FUCHSIA
+#if SANITIZER_FUCHSIA || SANITIZER_RTEMS
 
+#if SANITIZER_FUCHSIA
 #include "sanitizer_fuchsia.h"
+#elif SANITIZER_RTEMS
+#include "sanitizer_rtems.h"
+#endif
 #include "sanitizer_stacktrace.h"
 #include "sanitizer_symbolizer.h"
 
@@ -43,9 +47,6 @@
 // Global variable name or equivalent from data memory address.
 constexpr const char *kFormatData = "{{{data:%p}}}";
 
-// One frame in a backtrace (printed on a line by itself).
-constexpr const char *kFormatFrame = "{{{bt:%u:%p}}}";
-
 // This is used by UBSan for type names, and by ASan for global variable names.
 // It's expected to return a static buffer that will be reused on each call.
 const char *Symbolizer::Demangle(const char *name) {
@@ -97,7 +98,7 @@
 void RenderFrame(InternalScopedString *buffer, const char *format, int frame_no,
                  const AddressInfo &info, bool vs_style,
                  const char *strip_path_prefix, const char *strip_func_prefix) {
-  buffer->append(kFormatFrame, frame_no, info.address);
+  buffer->append(kFormatBacktraceFrame, frame_no, info.address);
 }
 
 Symbolizer *Symbolizer::PlatformInit() {
@@ -111,6 +112,7 @@
                         UnwindSignalStackCallbackType unwind,
                         const void *unwind_context) {}
 
+#if !SANITIZER_RTEMS
 struct UnwindTraceArg {
   BufferedStackTrace *stack;
   u32 max_depth;
@@ -146,6 +148,7 @@
   CHECK_NE(context, nullptr);
   UNREACHABLE("signal context doesn't exist");
 }
+#endif  // !SANITIZER_RTEMS
 
 }  // namespace __sanitizer