[U-Boot] Turning optimizations off
Jerry Van Baren
gerald.vanbaren at ge.com
Fri May 29 17:12:48 CEST 2009
Fahd Abidi wrote:
> Hello,
>
> I am debugging u-boot with a BDI and am running into a case where a
> variable gets optimized out. For the sake of debugging I am trying to
> turn off optimizations.
> I have the following in u-boot-2009.01/config.mk, but GDB still reports
> optimizations:
>
> OPTFLAGS= -Os -fno-schedule-insns -fno-schedule-insns2
> #-fomit-frame-pointer
>
> (gdb) stepi
>
> 0x0ff78750 in get_table_entry_name (table=<value optimized out>,
If you (temporarily) put "volatile" on the variable, the compiler should
not optimize it out. Obviously, this is a limited solution, but may get
your past your problem.
[snip]
> Does anyone know how to completely turn optimization off? Using no -O
> flag results in u-boot not compiling.
Theoretically, you could compile individual files w/o optimization (e.g.
if you compile it by hand, make shouldn't re-compile it). I doubt that
you want to go there, though...
> Fahd Abidi
Good luck,
gvb
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