set and ensure minimum version of LLVM

Closes #115.

Author: klemens-morgenstern

include/mrdox/Platform.hpp

@@ -21,6 +21,10 @@
 namespace clang {
 namespace mrdox {
 
+/** The minimum version of LLVM required
+*/
+#define MRDOX_MINIMUM_LLVM_VERSION 15
+
 //------------------------------------------------
 //
 // Shared Libraries

source/api/Config.cpp

@@ -12,11 +12,20 @@
 #include "ConfigImpl.hpp"
 #include "Support/Path.hpp"
 #include <mrdox/Error.hpp>
+
+#include <llvm/Config/llvm-config.h>
 #include <llvm/Support/FileSystem.h>
 #include <llvm/Support/Path.h>
 #include <llvm/Support/YAMLParser.h>
 #include <llvm/Support/YAMLTraits.h>
 
+// Check llvm version
+#define STRINGIFY(Value) #Value
+static_assert(
+    LLVM_VERSION_MAJOR >= MRDOX_MINIMUM_LLVM_VERSION,
+    "MrDox requires at least clang " STRINGIFY(MRDOX_MINIMUM_LLVM_VERSION)
+    ", got " LLVM_VERSION_STRING " instead.");
+
 namespace clang {
 namespace mrdox {