From 6282b28b6fe218390b843a8a71bb5cc2b63dd05c Mon Sep 17 00:00:00 2001
From: Bruno de Oliveira Abinader <bruno@mapbox.com>
Date: Tue, 11 Jul 2017 15:32:51 +0300
Subject: [core] Added MBGL_CONSTEXPR to satisfy GCC 4.9

---
 include/mbgl/map/mode.hpp     | 11 ++++++-----
 include/mbgl/util/convert.hpp |  4 +++-
 include/mbgl/util/util.hpp    |  7 +++++++
 3 files changed, 16 insertions(+), 6 deletions(-)

(limited to 'include')

diff --git a/include/mbgl/map/mode.hpp b/include/mbgl/map/mode.hpp
index afec5c0a08..05de2df22c 100644
--- a/include/mbgl/map/mode.hpp
+++ b/include/mbgl/map/mode.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <mbgl/util/util.hpp>
 #include <mbgl/util/traits.hpp>
 
 #include <cstdint>
@@ -51,23 +52,23 @@ enum class MapDebugOptions : EnumType {
 #endif // MBGL_USE_GLES2
 };
 
-constexpr MapDebugOptions operator|(MapDebugOptions lhs, MapDebugOptions rhs) {
+MBGL_CONSTEXPR MapDebugOptions operator|(MapDebugOptions lhs, MapDebugOptions rhs) {
     return MapDebugOptions(mbgl::underlying_type(lhs) | mbgl::underlying_type(rhs));
 }
 
-constexpr MapDebugOptions& operator|=(MapDebugOptions& lhs, MapDebugOptions rhs) {
+MBGL_CONSTEXPR MapDebugOptions& operator|=(MapDebugOptions& lhs, MapDebugOptions rhs) {
     return (lhs = MapDebugOptions(mbgl::underlying_type(lhs) | mbgl::underlying_type(rhs)));
 }
 
-constexpr bool operator&(MapDebugOptions lhs, MapDebugOptions rhs) {
+MBGL_CONSTEXPR bool operator&(MapDebugOptions lhs, MapDebugOptions rhs) {
     return mbgl::underlying_type(lhs) & mbgl::underlying_type(rhs);
 }
 
-constexpr MapDebugOptions& operator&=(MapDebugOptions& lhs, MapDebugOptions rhs) {
+MBGL_CONSTEXPR MapDebugOptions& operator&=(MapDebugOptions& lhs, MapDebugOptions rhs) {
     return (lhs = MapDebugOptions(mbgl::underlying_type(lhs) & mbgl::underlying_type(rhs)));
 }
 
-constexpr MapDebugOptions operator~(MapDebugOptions value) {
+MBGL_CONSTEXPR MapDebugOptions operator~(MapDebugOptions value) {
     return MapDebugOptions(~mbgl::underlying_type(value));
 }
 
diff --git a/include/mbgl/util/convert.hpp b/include/mbgl/util/convert.hpp
index c2b3d9950d..bedb1a4a08 100644
--- a/include/mbgl/util/convert.hpp
+++ b/include/mbgl/util/convert.hpp
@@ -1,3 +1,5 @@
+#include <mbgl/util/util.hpp>
+
 #include <array>
 #include <type_traits>
 #include <utility>
@@ -7,7 +9,7 @@ namespace util {
 
 template<typename To, typename From, std::size_t Size,
          typename = std::enable_if_t<std::is_convertible<From, To>::value>>
-constexpr std::array<To, Size> convert(const std::array<From, Size>&from) {
+MBGL_CONSTEXPR std::array<To, Size> convert(const std::array<From, Size>&from) {
     std::array<To, Size> to {};
     std::copy(std::begin(from), std::end(from), std::begin(to));
     return to;
diff --git a/include/mbgl/util/util.hpp b/include/mbgl/util/util.hpp
index c5a7cb3780..7960b40299 100644
--- a/include/mbgl/util/util.hpp
+++ b/include/mbgl/util/util.hpp
@@ -12,3 +12,10 @@
 #define MBGL_VERIFY_THREAD(tid)
 
 #endif
+
+// GCC 4.9 compatibility
+#if !defined(__GNUC__) || __GNUC__ >= 5
+#define MBGL_CONSTEXPR constexpr
+#else
+#define MBGL_CONSTEXPR inline
+#endif
-- 
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