Added compiler metadata (#21)

The libraries must be compiled with the same version of the compiler and pybind11.
If they are compiled with different versions bad things happen.
Adding this data at compile time allows dependent libraries to validate compatibility.

CMakeLists.txt

@@ -36,6 +36,9 @@ add_subdirectory(submodules/leveldb-mcpe)
 # Add python extension
 pybind11_add_module(_leveldb src/leveldb/__init__leveldb.py.cpp)
 target_compile_definitions(_leveldb PRIVATE PYBIND11_DETAILED_ERROR_MESSAGES)
+target_compile_definitions(_leveldb PRIVATE PYBIND11_VERSION="${pybind11_VERSION}")
+target_compile_definitions(_leveldb PRIVATE COMPILER_ID="${CMAKE_CXX_COMPILER_ID}")
+target_compile_definitions(_leveldb PRIVATE COMPILER_VERSION="${CMAKE_CXX_COMPILER_VERSION}")
 if (WIN32)
     target_compile_definitions(_leveldb PRIVATE "DLLX=__declspec(dllimport)")
 else()

src/leveldb/__init__leveldb.py.cpp

@@ -295,6 +295,12 @@ class LevelDBItemsRangeIterator {
 
 static void init_module(py::module m)
 {
+    py::dict compiler_config;
+    compiler_config["pybind11_version"] = PYBIND11_VERSION;
+    compiler_config["compiler_id"] = COMPILER_ID;
+    compiler_config["compiler_version"] = COMPILER_VERSION;
+    m.attr("compiler_config") = compiler_config;
+
     py::register_local_exception<LevelDBException>(m, "LevelDBException");
     py::register_local_exception<LevelDBEncrypted>(m, "LevelDBEncrypted");