make pc2line recording conditional to compilation option DUK_OPT_NO_PC2LINE (DUK_USE_PC2LINE)

src/duk_features.h

@@ -1227,6 +1227,15 @@ extern double duk_computed_nan;
 #undef DUK_USE_SECTION_B
 #endif
 
+/*
+ *  Function instance features.
+ */
+
+#define DUK_USE_PC2LINE
+#if defined(DUK_OPT_NO_PC2LINE)
+#undef DUK_USE_PC2LINE
+#endif
+
 /*
  *  Deep vs. shallow stack.
  *

src/duk_js_compiler.c

@@ -837,7 +837,8 @@ static void convert_to_function_template(duk_compiler_ctx *comp_ctx) {
 	}
 
 	/* _pc2line */
-	if (1) {  /* FIXME: condition */
+#ifdef DUK_USE_PC2LINE
+	if (1) {
 		/*
 		 *  Size-optimized pc->line mapping.
 		 */
@@ -846,10 +847,11 @@ static void convert_to_function_template(duk_compiler_ctx *comp_ctx) {
 		duk_hobject_pc2line_pack(thr, q_instr, (duk_uint_fast32_t) code_count);  /* -> pushes fixed buffer */
 		duk_def_prop_stridx(ctx, -2, DUK_STRIDX_INT_PC2LINE, DUK_PROPDESC_FLAGS_NONE);
 
-		/* FIXME: if assertions enabled, walk through all valid PCs
+		/* XXX: if assertions enabled, walk through all valid PCs
 		 * and check line mapping.
 		 */
 	}
+#endif  /* DUK_USE_PC2LINE */
 
 	/* fileName */
 	if (comp_ctx->h_filename) {