Attempt to fix 32 bit OSX build. The fix consists of adding -m32 and -m64

to the appropriate CFLAGS. In addition, memory hooks are very different
on OSX, so build of bcheck.c had to be disabled for now.

Change of the CFLAGS does affect builds on other platforms, and this needs
to be tested.

Makefile

@@ -36,10 +36,12 @@ endif
 endif
 
 ifeq ($(ARCH),i386)
-NATIVE_DEFINES=-DTCC_TARGET_I386
+NATIVE_DEFINES=-DTCC_TARGET_I386 
+CFLAGS+=-m32
 else
 ifeq ($(ARCH),x86-64)
 NATIVE_DEFINES=-DTCC_TARGET_X86_64
+CFLAGS+=-m64
 NATIVE_DEFINES+=$(if $(wildcard /lib64/ld-linux-x86-64.so.2),-DTCC_TARGET_X86_64_CENTOS)
 endif
 endif
@@ -140,6 +142,9 @@ endif
 ifdef CONFIG_UCLIBC
 BCHECK_O=
 endif
+ifeq ($(TARGETOS),Darwin)
+BCHECK_O=
+endif
 
 ifdef CONFIG_USE_LIBGCC
 LIBTCC1=
@@ -157,7 +162,7 @@ all: $(PROGS) $(TCCLIBS) $(TCCDOCS)
 
 # Host Tiny C Compiler
 tcc$(EXESUF): tcc.o $(LIBTCC)
-	$(CC) -o $@ $^ $(LIBS) $(LDFLAGS) $(LINK_LIBTCC)
+	$(CC) -o $@ $^ $(LIBS) $(CFLAGS) $(LDFLAGS) $(LINK_LIBTCC)
 
 # Cross Tiny C Compilers
 %-tcc$(EXESUF):