Hi, I clone this example in my machine (ubuntu16.04), and meet lots of undefined reference problems when linking all .o .a files together (in step $(CC) $(LDARGS) $(OUTPUT)/hello.o $(OUTPUT)/modelicaBaseListener.o $(OUTPUT)/modelicaLexer.o $(OUTPUT)/modelicaListener.o $(OUTPUT)/modelicaParser.o $(LIBS) -o hello).
hello.cpp:(.text+0x7c): undefined reference to antlr4::ANTLRInputStream::ANTLRInputStream(std::istream&) hello.cpp:(.text+0xb2): undefined reference to antlr4::CommonTokenStream::CommonTokenStream(antlr4::TokenSource*) hello.cpp:(.text+0xc1): undefined reference to antlr4::BufferedTokenStream::fill() hello.cpp:(.text+0xda): undefined reference to antlr4::BufferedTokenStream::getTokens() output/hello.o: In function antlr4::ANTLRInputStream::~ANTLRInputStream(): hello.cpp:(.text._ZN6antlr416ANTLRInputStreamD2Ev[_ZN6antlr416ANTLRInputStreamD5Ev]+0xd): undefined reference to vtable for antlr4::ANTLRInputStream hello.cpp:(.text._ZN6antlr416ANTLRInputStreamD2Ev[_ZN6antlr416ANTLRInputStreamD5Ev]+0x40): undefined reference to antlr4::CharStream::~CharStream()'

However, my classmate is able to make successfully in her macOS.
Any compiler or system requirement to make this hello example ?

Hi, i am working on a project of a compiler in cpp for Decaf. I have al ready generated the lexer an parser based on decaf grammar, i was using your hello.cpp for a guide but couldn't use the parser.stored_definition().

Everything else is working ok.