[C++] Add --warn flag which produces extra warnings

1 files changed, 4 insertions, 0 deletions

diff --git a/func.cc b/func.cc
index 4de6de8..a194eb7 100644
--- a/func.cc
+++ b/func.cc
@@ -455,6 +455,10 @@ void EvalFunc(const vector<Value*>& args, Evaluator* ev, string*) {
   //const string text = args[0]->Eval(ev);
   string* text = new string;
   args[0]->Eval(ev, text);
+  if (ev->avoid_io()) {
+    KATI_WARN("%s:%d: *warning*: $(eval) in a recipe is not recommended: %s",
+              LOCF(ev->loc()), text->c_str());
+  }
   vector<Stmt*> stmts;
   Parse(*text, ev->loc(), &stmts);
   for (Stmt* stmt : stmts) {