[OB PATCH] Build two gdb.cp testcases with -Wno-unused-comparison

[Gary Benson <gbenson@redhat.com>]

Clang fails to compile two testcases with the following error:
  warning: equality comparison result unused [-Wunused-comparison]

This prevents the following testcases from executing:
  gdb.cp/koenig.exp
  gdb.cp/operator.exp

This commit builds those testcases with -Wno-unused-comparison, to
avoid the failure.  Note that this commit reveals a new failure,
"FAIL: gdb.cp/koenig.exp: p foo (p_union)" when the testsuite is
compiled using clang.

gdb/testsuite/ChangeLog:

	* gdb.cp/koenig.exp (prepare_for_testing): Add
	additional_flags=-Wno-unused-comparison.
	* gdb.cp/operator.exp (prepare_for_testing): Likewise.
---
 gdb/testsuite/ChangeLog           | 6 ++++++
 gdb/testsuite/gdb.cp/koenig.exp   | 3 ++-
 gdb/testsuite/gdb.cp/operator.exp | 3 ++-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/gdb/testsuite/gdb.cp/koenig.exp b/gdb/testsuite/gdb.cp/koenig.exp
index b40ee43..25be2e5 100644
--- a/gdb/testsuite/gdb.cp/koenig.exp
+++ b/gdb/testsuite/gdb.cp/koenig.exp
@@ -15,7 +15,8 @@
 
 standard_testfile .cc
 
-if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} {debug c++}] } {
+if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
+      {debug c++ additional_flags=-Wno-unused-comparison}] } {
      return -1
 }
 
diff --git a/gdb/testsuite/gdb.cp/operator.exp b/gdb/testsuite/gdb.cp/operator.exp
index c2d2bdf..b48cd44 100644
--- a/gdb/testsuite/gdb.cp/operator.exp
+++ b/gdb/testsuite/gdb.cp/operator.exp
@@ -15,7 +15,8 @@
 
 standard_testfile .cc
 
-if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} {debug c++}] } {
+if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
+	  {debug c++ additional_flags=-Wno-unused-comparison}] } {
     return -1
 }
 
-- 
1.8.3.1