Configurable read buffer size

CMakeLists.txt

@@ -86,6 +86,27 @@ FetchContent_MakeAvailable(llhttp)
 
 include_directories(src)
 
+# Check for VLA (Variable Length Array) support
+include(CheckCXXSourceCompiles)
+check_cxx_source_compiles(
+  "
+int main() {
+  int n = 10;
+  char arr[n];
+  return 0;
+}
+"
+  HAVE_VLA_SUPPORT)
+
+if(NOT HAVE_VLA_SUPPORT)
+  message(
+    FATAL_ERROR
+      "Compiler must support Variable Length Arrays (VLA). Please use GCC or Clang."
+  )
+endif()
+
+message(STATUS "Compiler supports Variable Length Arrays")
+
 find_package(weaseljson REQUIRED)
 
 # Generate JSON token hash table using gperf