Enable more compiler warnings

src/CMakeLists.txt

 cmake_minimum_required(VERSION 2.8.12)
 project(bpftrace)
 
+add_compile_options("-std=c++14")
+add_compile_options("-Wall")
+add_compile_options("-Wextra")
+add_compile_options("-Wundef")
+add_compile_options("-Wpointer-arith")
+add_compile_options("-Wcast-align")
+add_compile_options("-Wwrite-strings")
+add_compile_options("-Wcast-qual")
+add_compile_options("-Wswitch-default")
+add_compile_options("-Wswitch-enum")
+add_compile_options("-Wconversion")
+add_compile_options("-Wunreachable-code")
+add_compile_options("-Wformat=2")
+add_compile_options("-Wstrict-overflow=5")
+add_compile_options("-Wdisabled-optimization")
+add_compile_options("-pedantic")
+
 find_package(BISON REQUIRED)
 find_package(FLEX REQUIRED)
 find_package(LLVM REQUIRED CONFIG)

src/ast.h

@@ -114,9 +114,9 @@ public:
 class Probe : public Node {
 public:
   Probe(std::string &type, std::string &attach_point, StatementList *stmts)
-    : type(type), attach_point(attach_point), pred(nullptr), stmts(stmts), name(type+":"+attach_point) { }
+    : type(type), attach_point(attach_point), name(type+":"+attach_point), pred(nullptr), stmts(stmts) { }
   Probe(std::string &type, std::string &attach_point, Predicate *pred, StatementList *stmts)
-    : type(type), attach_point(attach_point), pred(pred), stmts(stmts), name(type+":"+attach_point) { }
+    : type(type), attach_point(attach_point), name(type+":"+attach_point), pred(pred), stmts(stmts) { }
 
   std::string type;
   std::string attach_point;

src/semantic_analyser.cpp

@@ -10,7 +10,7 @@ namespace ast {
 
 using ebpf::bpftrace::typestr;
 
-void SemanticAnalyser::visit(Integer &integer)
+void SemanticAnalyser::visit(Integer &)
 {
   type_ = Type::integer;
 }
@@ -30,7 +30,7 @@ void SemanticAnalyser::visit(Builtin &builtin)
 
 void SemanticAnalyser::visit(Call &call)
 {
-  int nargs = 0;
+  std::vector<Expression*>::size_type nargs = 0;
   if (call.vargs) {
     nargs = call.vargs->size();
     for (Expression *expr : *call.vargs) {