add a few fixes for gcc

fixes #437

include/mbgl/text/collision.hpp

@@ -5,8 +5,9 @@
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-parameter"
+#ifdef __clang__
 #pragma GCC diagnostic ignored "-Wdeprecated-register"
-#ifndef __clang__
+#else
 #pragma GCC diagnostic ignored "-Wunused-local-typedefs"
 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
 #endif

include/mbgl/text/types.hpp

@@ -101,7 +101,7 @@ struct PlacementProperty {
         : zoom(zoom), rotationRange(rotationRange) {}
 
     inline operator bool() const {
-        return !isnan(zoom) && zoom != std::numeric_limits<float>::infinity() &&
+        return !std::isnan(zoom) && zoom != std::numeric_limits<float>::infinity() &&
                rotationRange[0] != rotationRange[1];
     }
 

include/mbgl/util/threadpool.hpp

@@ -4,6 +4,7 @@
 #include <pthread.h>
 #include <forward_list>
 #include <queue>
+#include <memory>
 
 namespace mbgl {
 namespace util {

include/mbgl/util/utf.hpp

@@ -4,11 +4,9 @@
 #include <memory>
 
 // g++/libstdc++ is missing c++11 codecvt support
-#ifdef __linux__
-#pragma GCC diagnostic push
 #ifndef __clang__
+#pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-local-typedefs"
-#endif
 #include <boost/locale.hpp>
 #pragma GCC diagnostic pop
 #else
@@ -20,7 +18,7 @@ namespace mbgl {
 
 namespace util {
 
-#ifdef __linux__
+#ifndef __clang__
 
 class utf8_to_utf32 {
  public:

include/mbgl/util/vec.hpp

@@ -71,7 +71,7 @@ struct vec2 {
 
     template<typename U = T, typename std::enable_if<std::numeric_limits<U>::has_quiet_NaN, int>::type = 0>
     inline operator bool() const {
-        return !isnan(x) && !isnan(y);
+        return !std::isnan(x) && !std::isnan(y);
     }
 
     template<typename U = T, typename std::enable_if<!std::numeric_limits<U>::has_quiet_NaN, int>::type = 0>