It seems to me that you are spending a lot of time trying to automate
warnings production when it may be more fruitful to simply document
any known limitations and workarounds in your package documentation.
Bash can be easily installed after the fact on most OSs. Building on
Solaris 2.6 and later is not like going to the moon since they are
perfectly usable but lack recent updates like <stdint.h>. I have not
found AIX or HP-UX to be much challenge either even though HP-UX has
bugs.
If C++ is involved, then the C++ compiler brand and version can be a
much bigger factor than the OS which happens to be used.
Bob
--
Bob Friesenhahn
bfriesen@xxxxxxxxxxxxxxxxxxx, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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