vxworks ignores O_EXCL in open, so noreplace open succeeds when it is
expected to fail.  xfail the tests.

Regstrapped on x86_64-linux-gnu.
Tested on arm-vxworks7 (gcc-12) and arm-eabi (trunk).  Ok to install?

for  libstdc++-v3/ChangeLog

        * testsuite/27_io/basic_ofstream/open/char/noreplace.cc: xfail
        on vxworks.
        * testsuite/27_io/basic_ofstream/open/wchar_t/noreplace.cc:
        Likewise.
---
 .../27_io/basic_ofstream/open/char/noreplace.cc    |    2 +-
 .../27_io/basic_ofstream/open/wchar_t/noreplace.cc |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/testsuite/27_io/basic_ofstream/open/char/noreplace.cc 
b/libstdc++-v3/testsuite/27_io/basic_ofstream/open/char/noreplace.cc
index 56ff2d7cead3c..2e99707df86d0 100644
--- a/libstdc++-v3/testsuite/27_io/basic_ofstream/open/char/noreplace.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_ofstream/open/char/noreplace.cc
@@ -1,4 +1,4 @@
-// { dg-do run }
+// { dg-do run { xfail *-*-vxworks* } }
 
 #include <ios>
 
diff --git 
a/libstdc++-v3/testsuite/27_io/basic_ofstream/open/wchar_t/noreplace.cc 
b/libstdc++-v3/testsuite/27_io/basic_ofstream/open/wchar_t/noreplace.cc
index f0425cdab3d23..ddb7fd691608c 100644
--- a/libstdc++-v3/testsuite/27_io/basic_ofstream/open/wchar_t/noreplace.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_ofstream/open/wchar_t/noreplace.cc
@@ -1,4 +1,4 @@
-// { dg-do run }
+// { dg-do run { xfail *-*-vxworks* } }
 
 #include <version>
 

-- 
Alexandre Oliva, happy hacker                https://FSFLA.org/blogs/lxo/
   Free Software Activist                       GNU Toolchain Engineer
Disinformation flourishes because many people care deeply about injustice
but very few check the facts.  Ask me about <https://stallmansupport.org>

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