[Bug 1097] New: compile-time pcp version access

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Bug ID	1097
Summary	compile-time pcp version access
Product	pcp
Version	unspecified
Hardware	All
OS	Linux
Status	NEW
Severity	major
Priority	P5
Component	pcp
Assignee	pcp@kenj.com.au
Reporter	fche@redhat.com
CC	pcp@oss.sgi.com
Classification	Unclassified

At this time, we lack a way for a pcp client program to fetch
the version of the -lpcp etc. headers & libraries.   (PMAPI_VERSION
is not it - it's been fixed at "2" for seven years, whereas new
PMAPI functions have blossomed in the interim.)

That makes it necessary for an app to use autoconf-type tricks to
detect the presence of new features they may wish to use.  It would
be nice if they had the choice to use something like linux:

#if PCP_VERSION_CODE >= PCP_VERSION(3,9,10)
...
#else
...
#endif

It could fit fairly naturally into the pcp/config*h generated files.

For bonus marks, it may be nice if the pmapi proper had a function
that returned the run-time libpcp version (which could naturally
be newer/larger than the compile-time PCP_VERSION_CODE).

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