[PATCH] [libstdc++] [testsuite] xfail double-prec from_chars for float128_t

[Alexandre Oliva <oliva@adacore.com>]

Tests 20_util/from_chars/4.cc and 20_util/to_chars/long_double.cc were
adjusted about a year ago to skip long double on some targets, because
the fastfloat library was limited to 64-bit doubles.

The same problem comes up in similar float128_t tests on
aarch64-vxworks.  This patch adjusts them similarly.

Unlike the earlier tests, that got similar treatment for
x86_64-vxworks, these haven't failed there.

Regstrapped on x86_64-linux-gnu.  Also tested with gcc-13 on arm-,
aarch64-, x86- and x86_64-vxworks7r2.  Ok to install?


for  libstdc++-v3/ChangeLog

	* testsuite/20_util/from_chars/8.cc: Skip float128_t testing
	on aarch64-vxworks.
	* testsuite/20_util/to_chars/float128-c++23.cc: Xfail run on
	aarch64-vxworks.
---
 libstdc++-v3/testsuite/20_util/from_chars/8.cc     |    3 ++-
 .../testsuite/20_util/to_chars/float128_c++23.cc   |    1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/20_util/from_chars/8.cc b/libstdc++-v3/testsuite/20_util/from_chars/8.cc
index ee60d88c332db..a6343422c5a91 100644
--- a/libstdc++-v3/testsuite/20_util/from_chars/8.cc
+++ b/libstdc++-v3/testsuite/20_util/from_chars/8.cc
@@ -17,6 +17,7 @@
 
 // { dg-do run { target c++23 } }
 // { dg-add-options ieee }
+// { dg-additional-options "-DSKIP_LONG_DOUBLE" { target aarch64-*-vxworks* } }
 
 #include <charconv>
 #include <string>
@@ -343,7 +344,7 @@ test06()
 #if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
   test_max_mantissa<std::float64_t, unsigned long long>();
 #endif
-#if defined(__GLIBCXX_TYPE_INT_N_0) \
+#if defined(__GLIBCXX_TYPE_INT_N_0) && !defined SKIP_LONG_DOUBLE \
     && defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
   test_max_mantissa<std::float128_t, unsigned __GLIBCXX_TYPE_INT_N_0>();
 #endif
diff --git a/libstdc++-v3/testsuite/20_util/to_chars/float128_c++23.cc b/libstdc++-v3/testsuite/20_util/to_chars/float128_c++23.cc
index 547632817b4bb..ca00761ee7c98 100644
--- a/libstdc++-v3/testsuite/20_util/to_chars/float128_c++23.cc
+++ b/libstdc++-v3/testsuite/20_util/to_chars/float128_c++23.cc
@@ -19,6 +19,7 @@
 // { dg-require-effective-target ieee_floats }
 // { dg-require-effective-target size32plus }
 // { dg-add-options ieee }
+// { dg-xfail-run-if "from_chars limited to double-precision" { aarch64-*-vxworks* } }
 
 #include <charconv>
 #include <stdfloat>

-- 
Alexandre Oliva, happy hacker            https://FSFLA.org/blogs/lxo/
   Free Software Activist                   GNU Toolchain Engineer
More tolerance and less prejudice are key for inclusion and diversity
Excluding neuro-others for not behaving ""normal"" is *not* inclusive