Token-pasting ("##") with armcc 5.06

I'm in the process of porting a lot of code originally written for the C51 compiler.  The code makes extensive use of the "##" token-pasting feature.  Explanation: http://www.keil.com/support/man/docs/c51/c51_pp_tokenpastingop.htm

How can I use token pasting (or a similar feature) with armcc 5.06?  I'm using Keil MDK 5.28 for an STM32 target device.

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