From fc0745a699a0ef60c080e9c2ff5eaecde9cb5306 Mon Sep 17 00:00:00 2001
From: Sudarsana Babu Nagineni <sudarsana.babu@mapbox.com>
Date: Thu, 9 Aug 2018 17:13:05 +0300
Subject: [core] Fix build when building Qt Location plugin for Android

- log2 is not available on Android before API 18.
- Android doesn't have 'round' on the std:: namespace when using g++.

Co-authored-by: Thiago Marcos P. Santos <thiago@mapbox.com>
---
 include/mbgl/math/log2.hpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'include/mbgl')

diff --git a/include/mbgl/math/log2.hpp b/include/mbgl/math/log2.hpp
index 6a1ba23ed9..3136ac22b4 100644
--- a/include/mbgl/math/log2.hpp
+++ b/include/mbgl/math/log2.hpp
@@ -2,6 +2,11 @@
 
 #include <cmath>
 #include <cstdint>
+#include <type_traits>
+
+#if defined(__ANDROID__)
+#include <android/api-level.h>
+#endif
 
 namespace mbgl {
 namespace util {
@@ -12,3 +17,14 @@ uint32_t ceil_log2(uint64_t x);
 
 } // namespace util
 } // namespace mbgl
+
+// log2 is not available on Android before API 18.
+#if defined(__ANDROID__) && defined(__GNUC__) && \
+    defined(__ANDROID_API__) && __ANDROID_API__ < 18
+
+template <typename T>
+typename std::enable_if_t<std::is_floating_point<T>::value, T> log2(T x) {
+    return ::log(x) / M_LN2;
+}
+
+#endif
-- 
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