gecko-dev/build/build-clang/find_symbolizer_linux_clang_15.patch

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_file.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_file.cpp
index c3e08f58c2ce..b5c5b9e3e74a 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_file.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_file.cpp
@@ -21,6 +21,10 @@
 #include "sanitizer_file.h"
 #  include "sanitizer_interface_internal.h"
 
+#if SANITIZER_LINUX
+#include "sanitizer_posix.h"
+#endif
+
 namespace __sanitizer {
 
 void CatastrophicErrorWrite(const char *buffer, uptr length) {
@@ -222,6 +226,34 @@ char *FindPathToBinary(const char *name) {
     if (*end == '\0') break;
     beg = end + 1;
   }
+
+#if SANITIZER_LINUX
+  // If we cannot find the requested binary in PATH, we should try to locate
+  // it next to the binary, in case it is shipped with the build itself
+  // (e.g. llvm-symbolizer shipped with sanitizer build to symbolize on client.
+  if (internal_readlink("/proc/self/exe", buffer.data(), kMaxPathLength) < 0)
+    return nullptr;
+
+  uptr buf_len = internal_strlen(buffer.data());
+
+  /* Avoid using dirname() here */
+  while (buf_len > 0) {
+    if (buffer[buf_len - 1] == '/')
+      break;
+    buf_len--;
+  }
+
+  if (!buf_len)
+    return nullptr;
+
+  if (buf_len + name_len + 1 <= kMaxPathLength) {
+    internal_memcpy(&buffer[buf_len], name, name_len);
+    buffer[buf_len + name_len] = '\0';
+    if (FileExists(buffer.data()))
+      return internal_strdup(buffer.data());
+  }
+#endif
+
   return nullptr;
 }