Add extra compiler flags

Author: simon-staal

Makefile

@@ -2,10 +2,9 @@
 
 CXXFLAGS := -std=c++20 # use the 2020 version of the C++ standard
 CXXFLAGS += -g # generate debugging information
-CXXFLAGS += -Wall # enable most warnings, except those about ...
-CXXFLAGS += -Wno-unused-parameter # ... unused function parameters, ...
-CXXFLAGS += -Wno-unused-variable # ... unused variables, ...
-CXXFLAGS += -Wno-unused-function # ... or unused functions.
+CXXFLAGS += -Wall # enable most warnings
+CXXFLAGS += -Wextra # enable extra warnings
+CXXFLAGS += -Werror # treat all warnings as errors
 CXXFLAGS += -fsanitize=address # enable address sanitization
 CXXFLAGS += -static-libasan # statically link with Address Sanitizer
 CXXFLAGS += -O0 # perform minimal optimisations

src/ast_constant.cpp

@@ -2,7 +2,7 @@
 
 namespace ast {
 
-void IntConstant::EmitRISC(std::ostream& stream, Context& context) const
+void IntConstant::EmitRISC(std::ostream& stream, Context&) const
 {
     stream << "li a0, " << value_ << std::endl;
 }

src/ast_identifier.cpp

@@ -2,7 +2,7 @@
 
 namespace ast {
 
-void Identifier::EmitRISC(std::ostream& stream, Context& context) const
+void Identifier::EmitRISC(std::ostream& stream, Context&) const
 {
     stream << identifier_;
 }

src/lexer.flex

@@ -7,6 +7,9 @@
   extern "C" int fileno(FILE *stream);
 
   #include "parser.tab.hpp"
+
+  // Suppress warning about unused function
+  [[maybe_unused]] static void yyunput (int c, char * yy_bp );
 %}
 
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