Add validation to avoid mixed versions of generated protogen code

Author: brunexgeek

CMakeLists.txt

@@ -6,6 +6,9 @@ set(PROTOGEN_MAJOR 0)
 set(PROTOGEN_MINOR 4)
 set(PROTOGEN_PATCH 0)
 
+add_definitions(-DPROTOGEN_MAJOR=${PROTOGEN_MAJOR})
+add_definitions(-DPROTOGEN_MINOR=${PROTOGEN_MINOR})
+add_definitions(-DPROTOGEN_PATCH=${PROTOGEN_PATCH})
 add_definitions(-DPROTOGEN_VERSION="${PROTOGEN_MAJOR}.${PROTOGEN_MINOR}.${PROTOGEN_PATCH}")
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wfatal-errors -pedantic -std=c++11 -Wl,--no-undefined -fPIC -Wall -Wextra -Wconversion -Werror=return-type -Werror=implicit-function-declaration")

compiler/main.cc

@@ -40,7 +40,7 @@ int main( int argc, char **argv )
         protogen::Proto3 proto;
         try
         {
-            protogen::Proto3::parse(proto, input, argv[1]);
+            protogen::Proto3::parse(proto, input, fullPath);
             protogen::CppGenerator gen;
             gen.generate(proto, output);
         } catch (protogen::exception &ex)

library/cppgen.cc

@@ -434,6 +434,10 @@ static std::string makeGuard( const std::string &fileName )
 
 static void generateModel( Printer &printer, const Proto3 &proto )
 {
+    char version[8] = { 0 };
+    snprintf(version, sizeof(version) - 1, "%02X%02X%02X",
+        (int) PROTOGEN_MAJOR, (int) PROTOGEN_MINOR, (int) PROTOGEN_PATCH);
+
     std::string guard = makeGuard(proto.fileName);
     printer(
         "// Generated by the protogen $1$ compiler.  DO NOT EDIT!\n"
@@ -445,8 +449,14 @@ static void generateModel( Printer &printer, const Proto3 &proto )
         "#include <iterator>\n"
         "#include <sstream>\n\n"
         "#pragma GCC diagnostic ignored \"-Wunused-function\"\n\n"
+        "#ifndef PROTOGEN_VERSION\n"
+        "    #define PROTOGEN_VERSION 0x$5$ // $1$\n"
+        "#endif\n"
+        "#if (PROTOGEN_VERSION != 0x$5$) // $1$\n"
+        "    #error Mixed versions of protogen!\n"
+        "#endif\n"
         // base template
-        "\n$2$\n", PROTOGEN_VERSION, BASE_TEMPLATE, proto.fileName, guard);
+        "\n$2$\n", PROTOGEN_VERSION, BASE_TEMPLATE, proto.fileName, guard, version);
 
     // forward declarations
     printer("\n// forward declarations\n");

library/proto3.cc

@@ -169,7 +169,7 @@ template <typename I> class InputStream
 
     public:
         InputStream( const I& first, const I& last ) : cur_(first), end_(last),
-            last_(-1), ungot_(false), line_(1), column_(0)
+            last_(-1), line_(1), column_(0), ungot_(false)
         {
         }