target-supports-dg.exp (dg-require-cxa-atexit): New.

	* lib/target-supports-dg.exp (dg-require-cxa-atexit): New.
	* lib/target-supports.dg (check_cxa_atexit_available): New.

From-SVN: r113684

gcc/testsuite/ChangeLog

+2006-05-09  Steve Ellcey  <sje@cup.hp.com>
+
+	* lib/target-supports-dg.exp (dg-require-cxa-atexit): New.
+	* lib/target-supports.dg (check_cxa_atexit_available): New.
+
 2005-05-10  Thomas Koenig  <Thomas.Koenig@online.de>
 
 	PR fortran/27470

gcc/testsuite/lib/target-supports-dg.exp

@@ -140,6 +140,15 @@ proc dg-require-mkfifo { args } {
     }
 }
 
+# If this target does not use __cxa_atexit, skip this test.
+
+proc dg-require-cxa-atexit { args } {
+    if { ![ check_cxa_atexit_available ] } {
+        upvar dg-do-what dg-do-what
+        set dg-do-what [list [lindex ${dg-do-what} 0] "N" "P"]
+    }
+}
+
 # Check the flags with which the test will be run against options in
 # a test directive that will skip or xfail that test.  The DejaGnu proc
 # check_conditional_xfail will look at the options in compiler_flags, so

gcc/testsuite/lib/target-supports.exp

@@ -916,6 +916,93 @@ proc check_mkfifo_available {} {
     return [check_function_available "mkfifo"]
 }
 
+# Returns true iff "__cxa_atexit" is used on the target system.
+
+proc check_cxa_atexit_available { } {
+    global et_cxa_atexit
+    global et_cxa_atexit_target_name
+    global tool	
+
+    if { ![info exists et_cxa_atexit_target_name] } {
+	set et_cxa_atexit_target_name ""
+    }
+
+    # If the target has changed since we set the cached value, clear it.
+    set current_target [current_target_name]
+    if { $current_target != $et_cxa_atexit_target_name } {
+	verbose "check_cxa_atexit_available: `$et_cxa_atexit_target_name'" 2
+	set et_cxa_atexit_target_name $current_target
+	if [info exists et_cxa_atexit] {
+	    verbose "check_cxa_atexit_available: removing cached result" 2
+	    unset et_cxa_atexit
+	}
+    }
+
+    if [info exists et_cxa_atexit] {
+	verbose "check_cxa_atexit_available: using cached result" 2
+    } else {
+	set et_cxa_atexit 0
+
+	# Set up, compile, and execute a C++ test program that depends
+	# on correct ordering of static object destructors. This is
+	# indicative of the presence and use of __cxa_atexit.
+	set src cxaatexit[pid].cc
+	set exe cxaatexit[pid].x
+
+	set f [open $src "w"]
+	puts $f "#include <stdlib.h>"
+	puts $f "static unsigned int count;"
+	puts $f "struct X"
+	puts $f "{"
+	puts $f "  X() { count = 1; }"
+	puts $f "  ~X()"
+	puts $f "  {"
+	puts $f "    if (count != 3)"
+	puts $f "      exit(1);"
+	puts $f "    count = 4;"
+        puts $f "  }"
+        puts $f "};"
+	puts $f "void f()"
+	puts $f "{"
+	puts $f "  static X x;"
+        puts $f "}"
+	puts $f "struct Y"
+	puts $f "{"
+	puts $f "  Y() { f(); count = 2; }"
+	puts $f "  ~Y()"
+	puts $f "  {"
+	puts $f "    if (count != 2)"
+	puts $f "      exit(1);"
+	puts $f "    count = 3;"
+        puts $f "  }"
+        puts $f "};"
+	puts $f "Y y;"
+	puts $f "int main()"
+	puts $f "{ return 0; }"
+	close $f
+
+	set lines [v3_target_compile $src $exe executable ""]
+	file delete $src
+
+	if [string match "" $lines] {
+	    # No error message, compilation succeeded.
+	    set result [${tool}_load "./$exe" "" ""]
+	    set status [lindex $result 0]
+	    remote_file build delete $exe
+
+	    verbose "check_cxa_atexit_available: status is <$status>" 2
+
+	    if { $status == "pass" } {
+		set et_cxa_atexit 1
+	    }
+	} else {
+	    verbose "check_cxa_atexit_available: compilation failed" 2
+	}
+    }
+    return $et_cxa_atexit
+}
+
+
 # Return 1 if we're generating 32-bit code using default options, 0
 # otherwise.