[U-Boot-Users] Compiler optimizations and debugging

[Wolfgang Denk]

In message <5.1.1.6.0.20030320104504.00a81840 at dns.struinfo.it> you wrote:
> To make the step-by-step debugging easier with GDB/DDD, I removed the 
> optimization flag "-Os" from the config.mk file. In fact, with the 
> optimization turned on, the code seems not to be executed sequentially 
> inside code window. However, without the -Os flag, the linker is unable to 

Well, the _optimized_ code _is_ exectued sequentially. But you cannot
expect that a sequence of lines of  C  code  results  in  a  strictly
sequential  sequence  of  machine  instructions. The potimizer will -
ummm - optimize the code.

> Why is the -Os flag absolutely necessary?

Because  otherwise  inline  functions  are  not  expanded.  See   the
documentation for GCC.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
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