diff --git a/compiler/cpp/src/main.h b/compiler/cpp/src/main.h
new file mode 100644
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--- /dev/null
+++ b/compiler/cpp/src/main.h
@@ -0,0 +1,103 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef T_MAIN_H
+#define T_MAIN_H
+
+#include <string>
+#include "parse/t_const.h"
+#include "parse/t_field.h"
+
+/**
+ * Defined in the flex library
+ */
+
+int yylex(void);
+
+int yyparse(void);
+
+/**
+ * Expected to be defined by Flex/Bison
+ */
+void yyerror(const char* fmt, ...);
+
+/**
+ * Parse debugging output, used to print helpful info
+ */
+void pdebug(const char* fmt, ...);
+
+/**
+ * Parser warning
+ */
+void pwarning(int level, const char* fmt, ...);
+
+/**
+ * Failure!
+ */
+void failure(const char* fmt, ...);
+
+/**
+ * Check constant types
+ */
+void validate_const_type(t_const* c);
+
+/**
+ * Check constant types
+ */
+void validate_field_value(t_field* field, t_const_value* cv);
+
+/**
+ * Check members of a throws block
+ */
+bool validate_throws(t_struct* throws);
+
+/**
+ * Converts a string filename into a thrift program name
+ */
+std::string program_name(std::string filename);
+
+/**
+ * Gets the directory path of a filename
+ */
+std::string directory_name(std::string filename);
+
+/**
+ * Get the absolute path for an include file
+ */
+std::string include_file(std::string filename);
+
+/**
+ * Clears any previously stored doctext string.
+ */
+void clear_doctext();
+
+/**
+ * Cleans up text commonly found in doxygen-like comments
+ */
+char* clean_up_doctext(char* doctext);
+
+/**
+ * Flex utilities
+ */
+
+extern int   yylineno;
+extern char  yytext[];
+extern FILE* yyin;
+
+#endif