DEFAULT_CALLER_SAVES doesn't work on the mac

[Ian Lance Taylor]

"Muhammed Fawzy" <mfawzymkh@hotmail.com> writes:

>    I am trying to force GCC to save ALL registers before functions
> calls. I am running GCC 4.0.1 on MAC OS X leopard.
> I am trying to achieve this by defining DEFAULT_CALLER_SAVES as well
> as compiling with -fcaller-saves.  however, disassemble of a simple
> helloworld program that calls functions a from main doesn't show any
> difference.
> is there any special thing needed to force gcc to save all registers ?

-fcaller-saves is the default when optimizing.

Try using -fcall-used-REG for all your registers.

Ian