additional changes

gui/Makefile

@@ -8,13 +8,28 @@
 # output dirs live at the repo root and are referenced through `$(ROOT)`.
 
 ODIN         ?= odin
+GDB          ?= gdb
 ROOT         := ..
 BIN          := $(ROOT)/bin
 BINARY       := $(BIN)/desi_explorer
 ODIN_FLAGS   := -collection:lib=lib/local
 WASM_DEFINE  := RAYLIB_WASM_LIB=env.o
 
-.PHONY: help setup add-dep run build build-debug build-web test clean fmt
+# Normalize GUI_ENV_FILE (given relative to the repo root) to an absolute path
+# so the Odin process can open it regardless of its working directory.
+# "override" is required because GUI_ENV_FILE is usually set on the command
+# line (or passed as an env var to this sub-make), which would otherwise
+# override any assignment made here.
+ifdef GUI_ENV_FILE
+ifneq ($(abspath $(GUI_ENV_FILE)),$(GUI_ENV_FILE))
+override GUI_ENV_FILE := $(abspath $(ROOT)/$(GUI_ENV_FILE))
+endif
+endif
+# "override" on a command-line variable silently drops it from the recipe
+# environment; re-export it so the app can find its env file (run + gdb).
+export GUI_ENV_FILE
+
+.PHONY: help setup add-dep run build build-debug gdb build-web test clean fmt
 
 help: ## List available targets
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | \
@@ -41,6 +56,9 @@ build-debug: ## Debug build -> bin/desi_explorer
 	@mkdir -p lib/local $(BIN)
 	$(ODIN) build src $(ODIN_FLAGS) -o:none -debug -out:$(BINARY)
 
+gdb: build-debug ## Run the native app under gdb (type 'run', then 'bt' on a crash)
+	$(GDB) -q --args $(BINARY) $(ARGS)
+
 build-web: ## WebAssembly build -> build/web (needs emscripten)
 	@scripts/build_web.sh