[CMake] Is there a way to group tests without polluting the cache?

[Alan W. Irwin]

I am in the process of emulating the autotools STDC_HEADERS macro which does
the following:

# Specifically, this macro checks for stdlib.h', stdarg.h',
# string.h', and float.h'; if the system has those, it probably
# has the rest of the ANSI C header files.  This macro also checks
# whether string.h' declares memchr' (and thus presumably the
# other mem' functions), whether stdlib.h' declare free' (and
# thus presumably malloc' and other related functions), and whether
# the ctype.h' macros work on characters with the high bit set, as
# ANSI C requires.

I want to store the result of the tests in one cached variable,
STDC_HEADERS.  So far, I am using CHECK_INCLUDE_FILES, and a couple of
instances of CHECK_PROTOTYPE_EXISTS (taken from the KDE
CheckPrototypeExists.cmake since apparently cmake does not have this module
yet).  Is there a way to re-use STDC_HEADERS for these different tests or do
I have to pollute the cache with a bunch of different variables
(STDC_HEADERS1, STDC_HEADERS2,....) from all the required tests and store
the AND of them as STDC_HEADERS?

Alan
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Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the Yorick front-end to PLplot (yplot.sf.net); the
Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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