From 01fa5dfdb75eda79ddae546e1e5ffc631342b501 Mon Sep 17 00:00:00 2001
From: hanez <you@hanez.org>
Date: Sun, 14 Sep 2025 15:48:28 +0200
Subject: [PATCH] Added -DFUN_DEBUG=ON flag as cmake option to enable debug
 messages. Default is -DFUN_DEBUG=off.

---
 CMakeLists.txt | 7 +++++++
 src/parser.c   | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ee4cd91..1ed8b6a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,13 @@ target_include_directories(fun_core PUBLIC
         ${CMAKE_CURRENT_SOURCE_DIR}/src
 )
 
+# Debug option to enable verbose parser/VM logging
+option(FUN_DEBUG "Enable extra debug logging in Fun" OFF)
+if(FUN_DEBUG)
+    message(STATUS "FUN_DEBUG enabled: building with verbose debug logging")
+    target_compile_definitions(fun_core PUBLIC FUN_DEBUG=1)
+endif()
+
 # Playground / interpreter (future /usr/bin/fun)
 add_executable(fun
         src/fun.c
diff --git a/src/parser.c b/src/parser.c
index 813aa54..3688ed9 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -328,8 +328,10 @@ static int emit_primary(Bytecode *bc, const char *src, size_t len, size_t *pos)
                 free(name);
                 return 0;
             }
+#ifdef FUN_DEBUG
             /* DEBUG: show compiled call */
             printf("compile: CALL %s with %d arg(s)\n", name, argc);
+#endif
             bytecode_add_instruction(bc, OP_CALL, argc);
             free(name);
             return 1;
@@ -845,10 +847,12 @@ static void parse_block(Bytecode *bc, const char *src, size_t len, size_t *pos,
             /* ensure function returns */
             bytecode_add_instruction(fn_bc, OP_RETURN, 0);
 
+#ifdef FUN_DEBUG
             /* DEBUG: dump compiled function bytecode */
             printf("=== compiled function %s (%d params) ===\n", fname, env.count);
             bytecode_dump(fn_bc);
             printf("=== end function %s ===\n", fname);
+#endif
 
             /* bind function to global: LOAD_CONST <fn> ; STORE_GLOBAL fgi */
             int fci = bytecode_add_constant(bc, make_function(fn_bc));