How to customize cffi-grovel:*cc*, *cc-flags*?

[Mirko Vukovic]

Hello,

in order to get GSLL to run on Windows7+CCL+MSYS2+GSL, I needed to
customize *cc* and *cc-flags*.  Right now, I do this by modifying the code
in grovel.lisp, as for *cc-flags*:

   #+(and windows msys2)
   (list "-I" "E:/msys64/mingw64/lib/libffi-3.2.1/include/"
         "-I"
"c:/Users/977315/quicklisp/dists/quicklisp/software/cffi_0.14.0/")


(I prefer not to modify system-wide environment variables on my PC)

I see alternate ways of achieving the same effect:

   1. Write own gsll loader that customizes *cc* and *cc-flags*
   2. Write own cffi-libffi loader that customizes the variables
   3. (somehow) advise gsll or cffi-libffi loaders in my lisp-init files to
   customize the variables
   4. Modify environment variables for my process.

What is the advised way to do this?  I would prefer 3: in my lisp startup
file, I (somehow) write some advice code to asdf that customize *cc* and
*cc-flags*.  But I don't know how to do that.

Thank you,

Mirko
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