From 4a23e833e66896f40bb36c3c13b4a4bb1b79162f Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Wed, 19 May 2021 17:32:13 -0700
Subject: [PATCH] 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 <raj.khem@gmail.com>
---
 .../lib/gwp_asan/optional/backtrace_linux_libc.cpp  | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp b/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp
index ea8e72be287d..0344074dd254 100644
--- a/compiler-rt/lib/gwp_asan/optional/backtrace_linux_libc.cpp
+++ b/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>
@@ -21,8 +23,11 @@
 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
@@ -30,7 +35,11 @@ size_t Backtrace(uintptr_t *TraceBuffer, size_t Size) {
 // 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
 
