FAQ-0720 What causes "undefined reference to `_call_via


FAQ-0720 What causes "undefined reference to `_call_via_r2'"in THUMB builds

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Classification:	C++	Category:	Utilities & Build Tools
Created:	07/31/2001	Modified:	09/11/2002
Number:	FAQ-0720
Platform:	Symbian OS v6.1

Question:
My code has suddenly stopped building for THUMB and gives errors about undefined references to functions called _call_via_rN for various values of N. I haven't changed any of the source code, so what's gone wrong?

Answer:
In release 6.1, various things were reorganised to reduce the size of typical ARM and THUMB executables. Part of this change included moving various compiler "helper functions" into a separate library, and changing MAKMAKE to include that library automatically where appropriate.

The most likely explanation for the errors described is that you've recently been using a 6.0 SDK, and your path is currently set to pick up the 6.0 version of the Symbian build tools.