[core] Fix build on Android + GCC and Android + armeabi

Sadly we don't have bots for these two setups.

2 files changed, 5 insertions, 3 deletions

diff --git a/include/mbgl/style/expression/parsing_context.hpp b/include/mbgl/style/expression/parsing_context.hpp
index 65c5ebe188..a983789cbd 100644
--- a/include/mbgl/style/expression/parsing_context.hpp
+++ b/include/mbgl/style/expression/parsing_context.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <mbgl/util/optional.hpp>
+#include <mbgl/util/string.hpp>
 #include <mbgl/style/expression/type.hpp>
 #include <mbgl/style/conversion.hpp>
 
@@ -104,11 +105,11 @@ public:
     }
     
     void error(std::string message, std::size_t child) {
-        errors->push_back({message, key + "[" + std::to_string(child) + "]"});
+        errors->push_back({message, key + "[" + util::toString(child) + "]"});
     }
     
     void error(std::string message, std::size_t child, std::size_t grandchild) {
-        errors->push_back({message, key + "[" + std::to_string(child) + "][" + std::to_string(grandchild) + "]"});
+        errors->push_back({message, key + "[" + util::toString(child) + "][" + util::toString(grandchild) + "]"});
     }
     
     void appendErrors(ParsingContext&& ctx) {
diff --git a/include/mbgl/style/expression/type.hpp b/include/mbgl/style/expression/type.hpp
index d801cd3ac9..da59eb001c 100644
--- a/include/mbgl/style/expression/type.hpp
+++ b/include/mbgl/style/expression/type.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <mbgl/util/optional.hpp>
+#include <mbgl/util/string.hpp>
 #include <mbgl/util/variant.hpp>
 #include <vector>
 
@@ -88,7 +89,7 @@ struct Array {
     Array(Type itemType_, optional<std::size_t> N_) : itemType(std::move(itemType_)), N(std::move(N_)) {}
     std::string getName() const {
         if (N) {
-            return "array<" + toString(itemType) + ", " + std::to_string(*N) + ">";
+            return "array<" + toString(itemType) + ", " + util::toString(*N) + ">";
         } else if (itemType == Value) {
             return "array";
         } else {