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-rw-r--r--dos/Makefile7
1 files changed, 6 insertions, 1 deletions
diff --git a/dos/Makefile b/dos/Makefile
index 61423cec..5fd52d1b 100644
--- a/dos/Makefile
+++ b/dos/Makefile
@@ -1,9 +1,14 @@
+gcc_ok = $(shell if gcc $(1) -c -x c /dev/null -o /dev/null 2>/dev/null; \
+ then echo $(1); else echo $(2); fi)
+
+M32 := $(call gcc_ok,-m32,) $(call gcc_ok,-ffreestanding,) $(call gcc_ok,-fno-stack-protector,)
+
CC = gcc
LD = ld -m elf_i386
OBJCOPY = objcopy
OPTFLAGS = -g -Os -march=i386 -falign-functions=0 -falign-jumps=0 -falign-loops=0 -fomit-frame-pointer
INCLUDES = -include code16.h -I. -I.. -I../libfat
-CFLAGS = -m32 -mregparm=3 -DREGPARM=3 -W -Wall -ffreestanding -msoft-float $(OPTFLAGS) $(INCLUDES)
+CFLAGS = $(M32) -mregparm=3 -DREGPARM=3 -W -Wall -msoft-float $(OPTFLAGS) $(INCLUDES)
LDFLAGS = -T com16.ld
AR = ar
RANLIB = ranlib