GNU Arm Embedded Toolchain

function level interworking?

Asked by Richard Lang

I'm currently porting an existing project targeting ARM7TDMI processor from IAR Embedded Workbench to version 4.9_2015q3 (Windows build) of this toolchain.

The existing codebase uses function level interworking, with a few arm functions in a codebase that in general is being compiled to thumb code.

I've tagged the ARM functions with

  __attribute__((target("arm")))

and am compiling with

  -mcpu=arm7tdmi-s -mthumb -mthumb-interwork

flags, and yet am getting a "target attribute is not supported on this machine" warning on each attribute tag.

What am I missing?

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Thomas Preud'homme (thomas-preudhomme) said : 		#1

Hi Richard,

I'm afraid support for these target attributes was only added for ARM during the GCC 6 development cycle and will thus be available in our toolchain only around 2016Q4. In the meantime I would suggest you to move the ARM function in a separate file, remove their target attribute and compile them with -marm.

Best regards.

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Richard Lang (r-e-lang) said : 		#2

OK, thanks