[arm-gnu] gcc-arm Compiler produce different object file for the same source file

[Abdurahman Alfeky]

Hi All ,

Have anyone face the following problem before:

Using the GCC compiler for ARM (windows) :

*arm-none-eabi-gcc.exe (Sourcery CodeBench Lite 2012.09-63) 4.7.2* version

I have got different object file produced every ~5 times i compiled the
same source file.

The optimization level 3 is used (aggressive) is used, compiler options
used:

-O3 -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp -fshort-wchar
-fshort-enums  -funsafe-math-optimizations -mvectorize-with-neon-quad

The dump of the different object files shows too many differences in
assembly instructions , registers and addresses used.

   -

   Is it normal that compiler optimize/compile exactly the same source file
   differently and produce different object files ?! is it a compiler bug ?
   -

   How to avoid this behavior without turning off aggressive optimization ?

Thanks

-- 
Abdurahman Alfeky,
Software Engineer
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