Re: [U-Boot-Users] [PATCH] Functions added to extern for stand alone programs

On 5/10/07, Wolfgang Denk wd@denx.de wrote:

+#if (CONFIG_COMMANDS & CFG_CMD_FLASH)

•   gd->jt[XF_do_protect] = (void *) do_protect;
  

•   gd->jt[XF_do_flerase] = (void *) do_flerase;
  

+#endif }

This #ifdef maze is too much even for my standards. And that does mean something.

Is there anybody out there with an idea how to avoid that?

The cond_syscall() macro in the Linux kernel might be worth stealing. How about something like this?

#define cond_extern(name) asm(".weak\t" #name "\n\t.set\t" #name ", unimpl_extern")

static int unimpl_extern(void) { return -ENOSYS; /* or something more appropriate */ }

cond_extern(do_protect); cond_extern(do_flerase);

Haavard