Fix C++ support in RPI

templates/concurrency_view/c_pohi_gpr/partition.tmplt

@@ -143,7 +143,6 @@ project @_CAPITALIZE:Name_@ is
          "-ffunction-sections",
          "-fdiagnostics-color=always",
          "-Wno-cast-function-type",
-         "-Wmissing-prototypes",
 @@IF@@ @_Coverage_@
          "-fprofile-arcs",
          "-ftest-coverage",
@@ -164,7 +163,7 @@ project @_CAPITALIZE:Name_@ is
 
       case Build is
          when "Release" =>
-            for Default_Switches ("C")   use Common_C_Switches   & ("-O2", "-DNDEBUG");
+            for Default_Switches ("C")   use Common_C_Switches   & ("-O2", "-DNDEBUG" ,"-Wmissing-prototypes");
             for Default_Switches ("C++") use Common_C_Switches   & ("-O2", "-DNDEBUG");
             for Default_Switches ("Ada") use Common_Ada_Switches & ("-O2", "-DNDEBUG");
          when "Debug" =>
@@ -185,6 +184,7 @@ project @_CAPITALIZE:Name_@ is
           "-lm",
 @@IF@@ @_CPU_Platform_@ = PLATFORM_RPI
           "-lgnat",
+          "-lstdc++",
 @@END_IF@@
 @@IF@@ @_Coverage_@
           "-fprofile-arcs",

templates/concurrency_view/rpi_cgpr/partition.tmplt

@@ -116,8 +116,8 @@ configuration project Raspberry_PI is
        for Export_File_Switch use "-Wl,--version-script=";
        for Map_File_Option    use "-Wl,-Map,";
        for Default_Switches ("C") use Common_C_Linker_Switches;
-       for Default_Switches ("C++") use Common_C_Linker_Switches;
-       for Default_Switches ("Ada") use ("-pipe", "-g", "-lm");
+       for Default_Switches ("C++") use Common_C_Linker_Switches & ("-lstdc++");
+       for Default_Switches ("Ada") use ("-pipe", "-g", "-lm", "-lgnat");
    end Linker;
 
    package Clean is