[gcc r14-1878] [libstdc++] [testsuite] xfail dbl from_chars for aarch64 rtems ldbl

[Alexandre Oliva <aoliva@gcc.gnu.org>]

https://gcc.gnu.org/g:a371a639b76f1bdcd7a957f400b5a7c0faf30a15

commit r14-1878-ga371a639b76f1bdcd7a957f400b5a7c0faf30a15
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Fri Jun 16 03:23:47 2023 -0300

    [libstdc++] [testsuite] xfail dbl from_chars for aarch64 rtems ldbl
    
    rtems, like vxworks, uses fast-float doubles for from_chars even for
    long double, so it loses precision, so expect the long double bits to
    fail on aarch64.
    
    
    for  libstdc++-v3/ChangeLog
    
            * testsuite/20_util/from_chars/4.cc: Skip long double on
            aarch64-rtems.

Diff:
---
 libstdc++-v3/testsuite/20_util/from_chars/4.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/20_util/from_chars/4.cc b/libstdc++-v3/testsuite/20_util/from_chars/4.cc
index 206e18daeb2..76e07df9d2b 100644
--- a/libstdc++-v3/testsuite/20_util/from_chars/4.cc
+++ b/libstdc++-v3/testsuite/20_util/from_chars/4.cc
@@ -18,7 +18,7 @@
 // <charconv> is supported in C++14 as a GNU extension
 // { dg-do run { target c++14 } }
 // { dg-add-options ieee }
-// { dg-additional-options "-DSKIP_LONG_DOUBLE" { target aarch64-*-vxworks* x86_64-*-vxworks* } }
+// { dg-additional-options "-DSKIP_LONG_DOUBLE" { target aarch64-*-rtems* aarch64-*-vxworks* x86_64-*-vxworks* } }
 
 #include <charconv>
 #include <string>