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stm32f10x_vector.s with GNU compiler

I am using Keil uVision3 in order to compile a .cpp file using STM32F103VE microcontroller.
I need to use GNU compiler instead of Keil ARM.

I am using the file stm32f10x_vector.s from the library of Keil\ARM\Startup\ST.
The problem appears when I try to assemble this file with GNU ( "error: unknown cpu 'cortex m3')

Maybe I have to change the assembler control string "-mpcu=cortex-m3", but what should I put?

Or maybe the problem is that this file is for Keil Arm compiler. Where could I find a startup file for this controller compiling with GNU?

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