Use a custom ToString instead of std::to_string that is not available on mingw.

Needed for #276.

--
MOS_MIGRATED_REVID=114867808

1 files changed, 15 insertions, 2 deletions

diff --git a/third_party/ijar/classfile.cc b/third_party/ijar/classfile.cc
index 09c03cfeeb..04e54221b9 100644
--- a/third_party/ijar/classfile.cc
+++ b/third_party/ijar/classfile.cc
@@ -33,11 +33,24 @@
 #include <string.h>
 
 #include <set>
+#include <sstream>
 #include <string>
 #include <vector>
 
 #include "third_party/ijar/common.h"
 
+namespace {
+// Converts a value to string.
+// Workaround for mingw where std::to_string is not implemented.
+// See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52015.
+template <typename T>
+std::string ToString(const T& value) {
+  std::ostringstream oss;
+  oss << value;
+  return oss.str();
+}
+}  // namespace
+
 namespace devtools_ijar {
 
 // See Table 4.3 in JVM Spec.
@@ -347,7 +360,7 @@ struct Constant_MethodHandle : Constant
   }
 
   std::string Display() {
-    return "Constant_MethodHandle::" + std::to_string(reference_kind_) + "::"
+    return "Constant_MethodHandle::" + ToString(reference_kind_) + "::"
         + constant(reference_index_)->Display();
   }
 
@@ -390,7 +403,7 @@ struct Constant_InvokeDynamic : Constant
 
   std::string Display() {
     return  "Constant_InvokeDynamic::"
-        + std::to_string(bootstrap_method_attr_index_) + "::"
+        + ToString(bootstrap_method_attr_index_) + "::"
         + constant(name_and_type_index_)->Display();
   }