[PATCH] gcc/testsuite/g++/bad-mapper-3.C: localhost might not be known

[Ross Burton]

The module-mapper uses Cody::OpenInet6 to open the connection to the
host. However, some distributions (such as Ubuntu 24.04) only have a v4
address for localhost:

  $ grep localhost /etc/hosts
  127.0.0.1  localhost
  ::1        ip6-localhost ip6-loopback

On these systems this test fails with "Name or service not known", so
add that to the list of allowed error messages.
---
 gcc/testsuite/g++.dg/modules/bad-mapper-3.C | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/g++.dg/modules/bad-mapper-3.C 
b/gcc/testsuite/g++.dg/modules/bad-mapper-3.C
index 2a57956afc87..ca7eec2e1df5 100644
--- a/gcc/testsuite/g++.dg/modules/bad-mapper-3.C
+++ b/gcc/testsuite/g++.dg/modules/bad-mapper-3.C
@@ -1,6 +1,6 @@
 //  { dg-additional-options "-fmodules-ts -fmodule-mapper=localhost:172477262" 
}
 import unique3.bob;
-// { dg-error {failed (socket|connecting|disabled) mapper 
'localhost:172477262'} "" { target *-*-* } 0 }
+// { dg-error {failed (socket|connecting|disabled|Name or service not known) 
mapper 'localhost:172477262'} "" { target *-*-* } 0 }
 // { dg-prune-output "fatal error:" }
 // { dg-prune-output "failed to read" }
 // { dg-prune-output "compilation terminated" }
-- 
2.43.0