fix: macOS build

CMakeLists.txt

@@ -26,7 +26,7 @@ set(OSGEARTH_VERSION ${OSGEARTH_MAJOR_VERSION}.${OSGEARTH_MINOR_VERSION}.${OSGEA
 # Increment this each time the ABI changes
 set(OSGEARTH_SOVERSION 154)
 
-# Require C++11
+# Require C++14
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 

src/osgEarth/CMakeLists.txt

@@ -15,6 +15,14 @@ find_package(SQLite3 REQUIRED)
 
 # optional
 find_package(geos QUIET)
+IF(APPLE)
+    # support of newer protobuf cmake - module
+    set(protobuf_MODULE_COMPATIBLE ON CACHE BOOL "")
+    find_package(Protobuf REQUIRED CONFIG)
+else()
+    find_package(Protobuf QUIET)
+endif()
+
 find_package(Protobuf QUIET)
 find_package(blend2d QUIET)
 find_package(blosc QUIET)

src/osgEarth/CoverageLayer

@@ -78,6 +78,8 @@ namespace osgEarth
 
         //! Table of preset sample values.
         struct Presets : public std::unordered_map<std::string, Config> {
+            Presets() : _nodata() {
+            }
             const Config _nodata;
             inline const Config& get(const std::string& name) const;
         };

src/osgEarthCesium/CesiumCreditsNode.cpp

@@ -45,7 +45,7 @@ namespace
             auto searchStartItr = input.begin();
             decltype(searchStartItr) imgItr;
             while ((imgItr = std::search(searchStartItr, input.end(), img.begin(), img.end(),
-                [&](unsigned char c1, unsigned char c2)
+                [&](char c1, char c2)
                 {
                     return std::toupper(c1, locale) == std::toupper(c2, locale);
                 })) != input.end())