Merge /u/elgaton/simgear/ branch specify-standards-fixes into next

https://sourceforge.net/p/flightgear/simgear/merge-requests/15/

CMakeLists.txt

@@ -22,6 +22,16 @@ set(CMAKE_OSX_DEPLOYMENT_TARGET 10.7)
 # only relevant for building shared libs but let's set it regardless
 set(CMAKE_OSX_RPATH 1)
 
+# Set the C++ standard to C++98 to avoid compilation errors on GCC 6 (which
+# defaults to C++14).
+if(CMAKE_VERSION VERSION_LESS "3.1")
+  if(CMAKE_COMPILER_IS_GNUCXX)
+    set (CMAKE_CXX_FLAGS "--std=gnu++98 ${CMAKE_CXX_FLAGS}")
+  endif()
+else()
+  set (CMAKE_CXX_STANDARD 98)
+endif()
+
 project(SimGear)
 
 # read 'version' file into a variable (stripping any newlines or spaces)

simgear/canvas/ShivaVG/src/shPipeline.c

@@ -80,8 +80,12 @@ void updateBlendingStateGL(VGContext *c, int alphaIsOne)
 
   case VG_BLEND_SRC_OVER: default:
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-    if (alphaIsOne) glDisable(GL_BLEND);
-    else glEnable(GL_BLEND); break;
+    if (alphaIsOne) {
+      glDisable(GL_BLEND);
+    } else {
+      glEnable(GL_BLEND);
+    }
+    break;
   };
 }
 

simgear/environment/metar.cxx

@@ -648,8 +648,9 @@ bool SGMetar::scanWeather()
 	weather = pre + weather + post;
 	weather.erase(weather.length() - 1);
 	_weather.push_back(weather);
-    if( ! w.phenomena.empty() )
+    if( ! w.phenomena.empty() ) {
         _weather2.push_back( w );
+    }
     _grpcount++;
     return true;
 }

simgear/package/Root.cxx

@@ -384,7 +384,7 @@ void Root::refresh(bool aForce)
     CatalogList toRefresh;
     CatalogDict::iterator it = d->catalogs.begin();
     for (; it != d->catalogs.end(); ++it) {
-        int age = it->second->ageInSeconds();
+        unsigned int age = it->second->ageInSeconds();
         if (aForce || (age > maxAgeSeconds())) {
             toRefresh.push_back(it->second);
         }

simgear/sound/sample_openal.cxx

@@ -260,5 +260,8 @@ SGPath SGSoundSample::file_path() const
 
 void SGSoundSample::free_data()
 {
-   if ( _data != NULL ) free( _data ); _data = NULL;
+   if ( _data != NULL ) {
+     free( _data );
+   }
+   _data = NULL;
 }