[llvm-readobj] Fix forward build breakages caused by https://reviews.llvm.org/rG33b3c...

Change: use std::function instead of function_ref because it's not safe to store a function_ref

(original phab: https://reviews.llvm.org/D116787)

diff --git a/llvm/tools/llvm-readobj/ObjDumper.h b/llvm/tools/llvm-readobj/ObjDumper.h
index c1edf981cf2a6dc461ee8d15aee5d04b1ceb3c0b..a7633301c5ab5e4044d52e12aec9bd5d6558730e 100644 (file)
--- a/llvm/tools/llvm-readobj/ObjDumper.h
+++ b/llvm/tools/llvm-readobj/ObjDumper.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_TOOLS_LLVM_READOBJ_OBJDUMPER_H
 #define LLVM_TOOLS_LLVM_READOBJ_OBJDUMPER_H
 
+#include <functional.
 #include <memory>
 #include <system_error>
 
@@ -44,7 +45,7 @@ class ScopedPrinter;
 class SymbolComparator {
 public:
   using CompPredicate =
-      function_ref<bool(object::SymbolRef, object::SymbolRef)>;
+      std::function<bool(object::SymbolRef, object::SymbolRef)>;
 
   // Each Obj format has a slightly different way of retrieving a symbol's info
   // So we defer the predicate's impl to each format.