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From: "Vladimir N. Oleynik" <dzo@simtreas.ru>
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Subject: [Qemu-devel] portable to old compiler and kernel
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To: qemu-devel@nongnu.org

Hi.

I make qemu 0.5.5 with egcs and kernel 2.2.X with changes:

1) target-i386.c have duplicate initialize (egcs stoped with errors):

[INDEX_op_cmpxchgb_T0_T1_EAX_cc] = CC_OSZAPC,
[INDEX_op_cmpxchgw_T0_T1_EAX_cc] = CC_OSZAPC,
[INDEX_op_cmpxchgl_T0_T1_EAX_cc] = CC_OSZAPC,
and with generate from
DEF_WRITEF( )


2) oss.c, hw/ dma.c fdc.c sb16.c
change macros
#define lwarn(...)
#define linfo(...)
#define ldebug(...)
to
#define lwarn(...)
#define linfo(args...)
#define ldebug(args...)

3) hw/fdc.c
#define FLOPPY_ERROR(fmt, args...) \
do { printf("FLOPPY ERROR: %s: " fmt, __func__ , ##args); } while (0)
to
#define FLOPPY_ERROR(fmt, args...) \
do { printf("FLOPPY ERROR: %s: " fmt, __FUNCTION__ , ##args); } while (0)

4) my glibc have declaration with "int" type from signal.h, I unset from vl.c
//extern void __sigaction();


My kernel 2.2.X dont have linux/if_tun.h
I make new preprocessor CONFIG_IF_TUN option and change vl.c

#ifdef CONFIG_IF_TUN
#include <linux/if_tun.h>
#endif

and

static int tun_open(char *ifname, int ifname_size)
{
#if CONFIG_IF_TUN
     struct ifreq ifr;
     int fd, ret;

     fd = open("/dev/net/tun", O_RDWR);
     if (fd < 0) {
         fprintf(stderr, "warning: could not open /dev/net/tun: no virtual 
network emulation\n");
         return -1;
     }
     memset(&ifr, 0, sizeof(ifr));
     ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
     pstrcpy(ifr.ifr_name, IFNAMSIZ, "tun%d");
     ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
     if (ret != 0) {
         close(fd);
#endif
         fprintf(stderr, "warning: could not configure /dev/net/tun: no virtual 
network emulation\n");
         return -1;
#if CONFIG_IF_TUN
     }
     printf("Connected to host network interface: %s\n", ifr.ifr_name);
     pstrcpy(ifname, ifname_size, ifr.ifr_name);
     fcntl(fd, F_SETFL, O_NONBLOCK);
     return fd;
#endif
}


Its works now.


--w
vodz