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arm-...-gcc 8.3.1 VS 4.9.3

Zeb

Dears,

I have been compiling with arm-none-eabi-gcc version 4.9.3 for a while; and everything were just fine with a Cortex-M0  I recently have tried using version 8.3.1 and things are not going as well.

I compiled the exact same code with the released version described earlier.
- ...-gcc 4.9.3: Code complies and runs properly;
- ...-gcc 8.3.1: Code compiles and seems to not execute on target.

I've been looking in the GCC changelogs and I cannot see any change that could explain the behaviour.

The command line is as follows:

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arm-none-eabi-(version)
-g
-mthumb
-mcpu:cortex-m0
-std=c99
(source files)
-I (include paths)
-L (path to linker script)
-T (linker script)
-o (target.elf)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Any idea of what could explain the compiler behaviour to change from version 4.9 to 8.3?

Any default option has been changed since 4.9?

I thank you for your help

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