Patch: testsuite change to add new effective keyword (cxa_atexit)

[Steve Ellcey]

A while back I brought the check_cxa_atexit_available and
dg-require-cxa-atexit tests over from the libstdc++-v3 subdirectory.
I was going to use dg-require-cxa-atexit to not run some C++ tests on
machines that don't have __cxa_atexit but I got a request to XFAIL them
rather than not run them.  To do this I would like to create a
cxa_atexit effective keyword (by calling the existing
check_cxa_atexit_available routine) and use this to XFAIL tests by
using:

	// { dg-do run { xfail { ! { cxa_atexit } } } }

in the actual tests.

I will send the test changes seperately, this patch is just for the
testsuite infrastructure change needed to implement this test.

Tested on IA64 HP-UX and Linux.
Ok to checkin?

Steve Ellcey
sje@cup.hp.com


2006-06-01  Steve Ellcey  <sje@cup.hp.com>
	
	* lib/target-supports.exp (is-effective-target): Add cxa_atexit.
	(is-effective-target-keyword): Ditto.

Index: gcc/testsuite/lib/target-supports.exp
===================================================================
--- gcc/testsuite/lib/target-supports.exp	(revision 114291)
+++ gcc/testsuite/lib/target-supports.exp	(working copy)
@@ -1749,6 +1749,7 @@ proc is-effective-target { arg } {
 	  "vmx_hw"         { set selected [check_vmx_hw_available] }
 	  "named_sections" { set selected [check_named_sections_available] }
 	  "gc_sections"    { set selected [check_gc_sections_available] }
+	  "cxa_atexit"     { set selected [check_cxa_atexit_available] }
 	  default          { error "unknown effective target keyword `$arg'" }
 	}
     }
@@ -1767,6 +1768,7 @@ proc is-effective-target-keyword { arg }
 	  "vmx_hw"         { return 1 }
 	  "named_sections" { return 1 }
 	  "gc_sections"    { return 1 }
+	  "cxa_atexit"     { return 1 }
 	  default          { return 0 }
 	}
     }