feat: add warning in DOOM for missing wad

programs/src/doom/Makefile

@@ -8,11 +8,13 @@ MAKEFLAGS += -rR
 
 TOOLCHAIN_PREFIX := $(shell cd ../../.. && pwd)/toolchain/local/bin/x86_64-elf-
 ifneq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
-    CC := $(TOOLCHAIN_PREFIX)gcc
-    LD := $(TOOLCHAIN_PREFIX)gcc
+    CC  := $(TOOLCHAIN_PREFIX)gcc
+    CXX := $(TOOLCHAIN_PREFIX)g++
+    LD  := $(TOOLCHAIN_PREFIX)gcc
 else
-    CC := gcc
-    LD := gcc
+    CC  := gcc
+    CXX := g++
+    LD  := gcc
 endif
 
 # ---- Paths ----
@@ -21,6 +23,7 @@ DOOM_SRC   := ../../../doomgeneric/doomgeneric
 LIBC_INC   := ../../include/libc
 PROG_INC   := ../../include
 LIBDIR     := ../../lib
+LOADER_LIB := ../../lib/libloader
 LINK_LD    := ../../link.ld
 BINDIR     := ../../bin
 OBJDIR     := obj
@@ -58,6 +61,32 @@ CFLAGS := \
     -I $(DOOM_SRC) \
     -isystem $(shell $(CC) -print-file-name=include)
 
+CXXFLAGS := \
+    -std=gnu++20 \
+    -g -O2 -pipe \
+    -Wall \
+    -Wno-unused-parameter \
+    -nostdinc \
+    -ffreestanding \
+    -fno-stack-protector \
+    -fno-stack-check \
+    -fno-PIC \
+    -fno-rtti \
+    -fno-exceptions \
+    -ffunction-sections \
+    -fdata-sections \
+    -m64 \
+    -march=x86-64 \
+    -msse \
+    -msse2 \
+    -mno-red-zone \
+    -mcmodel=small \
+    -isystem $(LIBC_INC) \
+    -I . \
+    -I $(PROG_INC) \
+    -isystem ../../../kernel/freestnd-c-hdrs/x86_64/include \
+    -isystem ../../../kernel/freestnd-cxx-hdrs/x86_64/include
+
 # ---- Linker flags ----
 
 LDFLAGS := \
@@ -156,13 +185,15 @@ DOOM_SRCS := \
     z_zone.c
 
 # Local source files
-LOCAL_SRCS := doomgeneric_montauk.c i_sound_montauk.c
+LOCAL_SRCS     := doomgeneric_montauk.c i_sound_montauk.c
+LOCAL_CXX_SRCS := doom_wad_check.cpp
 
 # ---- Object files ----
 
-DOOM_OBJS  := $(addprefix $(OBJDIR)/,$(DOOM_SRCS:.c=.o))
-LOCAL_OBJS := $(addprefix $(OBJDIR)/,$(LOCAL_SRCS:.c=.o))
-ALL_OBJS   := $(DOOM_OBJS) $(LOCAL_OBJS)
+DOOM_OBJS     := $(addprefix $(OBJDIR)/,$(DOOM_SRCS:.c=.o))
+LOCAL_OBJS    := $(addprefix $(OBJDIR)/,$(LOCAL_SRCS:.c=.o))
+LOCAL_CXX_OBJS := $(addprefix $(OBJDIR)/,$(LOCAL_CXX_SRCS:.cpp=.o))
+ALL_OBJS      := $(DOOM_OBJS) $(LOCAL_OBJS) $(LOCAL_CXX_OBJS)
 
 # ---- Target ----
 
@@ -174,7 +205,7 @@ all: $(TARGET)
 
 $(TARGET): $(ALL_OBJS) $(LINK_LD) Makefile
 	mkdir -p $(BINDIR)/apps/doom
-	$(LD) $(CFLAGS) $(LDFLAGS) $(ALL_OBJS) $(LIBDIR)/libc/liblibc.a -o $@
+	$(LD) $(CFLAGS) $(LDFLAGS) $(ALL_OBJS) $(LOADER_LIB)/liblibloader.a $(LIBDIR)/libc/liblibc.a -o $@
 
 # DOOM source files (from doomgeneric directory)
 $(OBJDIR)/%.o: $(DOOM_SRC)/%.c Makefile
@@ -186,6 +217,11 @@ $(OBJDIR)/%.o: %.c Makefile
 	mkdir -p $(OBJDIR)
 	$(CC) $(CFLAGS) -MMD -MP -c $< -o $@
 
+# Local C++ source files
+$(OBJDIR)/%.o: %.cpp Makefile
+	mkdir -p $(OBJDIR)
+	$(CXX) $(CXXFLAGS) -MMD -MP -c $< -o $@
+
 clean:
 	rm -rf $(OBJDIR) $(TARGET)