jumping to errors in non-existent files

When I run my program from within vim

     :./xyz

and the program errors out with a runtime error, e.g.:

    myprog: myprog.cpp:123: assertion 'x==1' failed

vim tries to interpret the the output and jump to the offending line number.

The problem is that in the example above it incorrectly interprets the filename as "myprog: myprog.cpp", so it opens a file with that name, which doesn't exist, and then tries to jump to line 123 in that non-existent file.

My question is:  Where in vim is this behaviour specified and how can I tweak it to do the right thing?

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