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Warning: It blocks containing 32-bit Thumb instructions are deprecated in ARMv8 with GCC 4.9

Dear colleagues.

I am compiling the Intel TBB in an effort to optimize my code to the Cortex-M53, however, because I was still forced to use GCC 4.9 I'm getting some warning messages about the use of  32bit Thumb Instrucions in IT blocks:

Warning: It blocks containing 32-bit Thumb instructions are deprecated in ARMv8

I know it's a bug in this release and that may already be solved in GCC version 5.3 but still can not migrate this environment for a new version.

This can bring some instability to my code or can be ignored by time?