compiler-rt: Do not use backtrace APIs on non-glibc linux

musl e.g. does not provide backtrace APIs

Upstream-Status: Pending
Signed-off-by: Khem Raj <[email protected]>

Author: kraj

compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp

@@ -7,7 +7,9 @@
 //===----------------------------------------------------------------------===//
 
 #include <assert.h>
+#ifdef __GLIBC__
 #include <execinfo.h>
+#endif
 #include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -21,16 +23,23 @@
 namespace {
 size_t Backtrace(uintptr_t *TraceBuffer, size_t Size) {
   static_assert(sizeof(uintptr_t) == sizeof(void *), "uintptr_t is not void*");
-
+#ifdef __GLIBC__
   return backtrace(reinterpret_cast<void **>(TraceBuffer), Size);
+#else
+  return -1;
+#endif
 }
 
 // We don't need any custom handling for the Segv backtrace - the libc unwinder
 // has no problems with unwinding through a signal handler. Force inlining here
 // to avoid the additional frame.
 GWP_ASAN_ALWAYS_INLINE size_t SegvBacktrace(uintptr_t *TraceBuffer, size_t Size,
                                             void * /*Context*/) {
+#ifdef __GLIBC__
   return Backtrace(TraceBuffer, Size);
+#else
+  return -1;
+#endif
 }
 
 static void PrintBacktrace(uintptr_t *Trace, size_t TraceLength,
@@ -40,6 +49,7 @@ static void PrintBacktrace(uintptr_t *Trace, size_t TraceLength,
     return;
   }
 
+#ifdef __GLIBC__
   char **BacktraceSymbols =
       backtrace_symbols(reinterpret_cast<void **>(Trace), TraceLength);
 
@@ -53,6 +63,7 @@ static void PrintBacktrace(uintptr_t *Trace, size_t TraceLength,
   Printf("\n");
   if (BacktraceSymbols)
     free(BacktraceSymbols);
+#endif
 }
 } // anonymous namespace