[core] Fix issues with the std:: namespace and old compilers

Specifically when building Android with GCC 4.9 (which Qt still does :-/)

8 files changed, 39 insertions, 3 deletions

diff --git a/include/mbgl/util/string.hpp b/include/mbgl/util/string.hpp
index de061647b5..82d317c620 100644
--- a/include/mbgl/util/string.hpp
+++ b/include/mbgl/util/string.hpp
@@ -1,9 +1,34 @@
 #pragma once
 
+#include <sstream>
 #include <string>
 #include <cassert>
+#include <cstdlib>
 #include <exception>
 
+// Polyfill needed by Qt when building for Android with GCC
+#if defined(__ANDROID__) && defined(__GLIBCXX__)
+
+namespace std {
+
+template <typename T>
+std::string to_string(T value)
+{
+    std::ostringstream oss;
+    oss << value;
+
+    return oss.str();
+}
+
+inline int stoi(const std::string &str)
+{
+    return atoi(str.c_str());
+}
+
+} // namespace std
+
+#endif
+
 namespace mbgl {
 namespace util {
 
diff --git a/src/mbgl/annotation/shape_annotation_impl.hpp b/src/mbgl/annotation/shape_annotation_impl.hpp
index ed9e8d015a..caf2cff1a5 100644
--- a/src/mbgl/annotation/shape_annotation_impl.hpp
+++ b/src/mbgl/annotation/shape_annotation_impl.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <mbgl/util/string.hpp>
 #include <mapbox/geojsonvt.hpp>
 
 #include <mbgl/annotation/annotation.hpp>
diff --git a/src/mbgl/style/parser.cpp b/src/mbgl/style/parser.cpp
index 467b44632c..a83897dbf5 100644
--- a/src/mbgl/style/parser.cpp
+++ b/src/mbgl/style/parser.cpp
@@ -8,6 +8,7 @@
 #include <mbgl/style/conversion/light.hpp>
 
 #include <mbgl/util/logging.hpp>
+#include <mbgl/util/string.hpp>
 
 #include <mapbox/geojsonvt.hpp>
 
diff --git a/src/mbgl/style/sources/geojson_source_impl.cpp b/src/mbgl/style/sources/geojson_source_impl.cpp
index be347af2ab..efa4018b46 100644
--- a/src/mbgl/style/sources/geojson_source_impl.cpp
+++ b/src/mbgl/style/sources/geojson_source_impl.cpp
@@ -1,10 +1,13 @@
 #include <mbgl/style/sources/geojson_source_impl.hpp>
 #include <mbgl/util/constants.hpp>
 #include <mbgl/tile/tile_id.hpp>
+#include <mbgl/util/string.hpp>
 
 #include <mapbox/geojsonvt.hpp>
 #include <supercluster.hpp>
 
+#include <cmath>
+
 namespace mbgl {
 namespace style {
 
@@ -52,14 +55,14 @@ GeoJSONSource::Impl::Impl(const Impl& other, const GeoJSON& geoJSON)
         mapbox::supercluster::Options clusterOptions;
         clusterOptions.maxZoom = options.clusterMaxZoom;
         clusterOptions.extent = util::EXTENT;
-        clusterOptions.radius = std::round(scale * options.clusterRadius);
+        clusterOptions.radius = ::round(scale * options.clusterRadius);
         data = std::make_unique<SuperclusterData>(
             geoJSON.get<mapbox::geometry::feature_collection<double>>(), clusterOptions);
     } else {
         mapbox::geojsonvt::Options vtOptions;
         vtOptions.maxZoom = options.maxzoom;
         vtOptions.extent = util::EXTENT;
-        vtOptions.buffer = std::round(scale * options.buffer);
+        vtOptions.buffer = ::round(scale * options.buffer);
         vtOptions.tolerance = scale * options.tolerance;
         data = std::make_unique<GeoJSONVTData>(geoJSON, vtOptions);
     }
diff --git a/src/mbgl/text/shaping.cpp b/src/mbgl/text/shaping.cpp
index c81f25d4eb..6c7ecff42a 100644
--- a/src/mbgl/text/shaping.cpp
+++ b/src/mbgl/text/shaping.cpp
@@ -7,6 +7,7 @@
 #include <boost/algorithm/string.hpp>
 
 #include <algorithm>
+#include <cmath>
 
 namespace mbgl {
 
@@ -72,7 +73,7 @@ float determineAverageLineWidth(const std::u16string& logicalInput,
         }
     }
     
-    int32_t targetLineCount = std::fmax(1, std::ceil(totalWidth / maxWidth));
+    int32_t targetLineCount = ::fmax(1, std::ceil(totalWidth / maxWidth));
     return totalWidth / targetLineCount;
 }
 
diff --git a/src/mbgl/tile/geojson_tile.cpp b/src/mbgl/tile/geojson_tile.cpp
index d5e2e14e54..f6861140b7 100644
--- a/src/mbgl/tile/geojson_tile.cpp
+++ b/src/mbgl/tile/geojson_tile.cpp
@@ -2,6 +2,7 @@
 #include <mbgl/tile/geometry_tile_data.hpp>
 #include <mbgl/renderer/query.hpp>
 #include <mbgl/renderer/tile_parameters.hpp>
+#include <mbgl/util/string.hpp>
 
 #include <mapbox/geojsonvt.hpp>
 #include <supercluster.hpp>
diff --git a/src/mbgl/util/dtoa.cpp b/src/mbgl/util/dtoa.cpp
index 6ca3e19c3d..0e3aef6117 100644
--- a/src/mbgl/util/dtoa.cpp
+++ b/src/mbgl/util/dtoa.cpp
@@ -6,6 +6,8 @@
 #include <rapidjson/internal/dtoa.h>
 #endif
 
+#include <mbgl/util/string.hpp>
+
 namespace mbgl {
 namespace util {
 
diff --git a/src/mbgl/util/http_header.cpp b/src/mbgl/util/http_header.cpp
index 40711232ff..ce31a06c5e 100644
--- a/src/mbgl/util/http_header.cpp
+++ b/src/mbgl/util/http_header.cpp
@@ -1,5 +1,7 @@
 #include <mbgl/util/http_header.hpp>
 
+#include <mbgl/util/string.hpp>
+
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunknown-pragmas"
 #pragma GCC diagnostic ignored "-Wunused-parameter"