RE: wrong-type-argument in gud-tooltip-mode

[Herbert Euler]

> How about the patch below. There seems to be no point in running call-process
> with no input file. I could probably also remove the string-match for
> "\\`\\*.+\\*\\'" in gud-tooltip-mode too, as these buffers have no files
> associated with them anyway.

It works.  However, calling `call-process' with its second argument
(INFILE) set to nil here might not be trivial, since at least gcc
prints something when its input is /dev/null:

$ gcc -E -dM - 
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