[PATCH] [PR105324] libstdc++: testsuite: pr105324 requires FP from_char

[Alexandre Oliva <oliva@adacore.com>]

The floating-point overloads of from_char are only declared if
_GLIBCXX_HAVE_USELOCALE is #defined as nonzero.  That's exposed from
charconv as _cpp_lib_to_chars >= 201611L, so guard the test body with
that.

Regstrapped on ppc64le-linux-gnu, and tested on
x86_64-linux-gnu-x-ppc{,64}-vx7r2 (without _GLIBCXX_HAVE_USELOCALE).
Ok to install?  gcc-12?  gcc-11?


for  libstdc++-v3/ChangeLog

	PR c++/105324
	* testsuite/20_util/from_chars/pr105324.cc: Guard test body
	with conditional for floating-point overloads of from_char.
---
 .../testsuite/20_util/from_chars/pr105324.cc       |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/libstdc++-v3/testsuite/20_util/from_chars/pr105324.cc b/libstdc++-v3/testsuite/20_util/from_chars/pr105324.cc
index cecb17e41cc68..a9e08303ef49d 100644
--- a/libstdc++-v3/testsuite/20_util/from_chars/pr105324.cc
+++ b/libstdc++-v3/testsuite/20_util/from_chars/pr105324.cc
@@ -5,10 +5,12 @@
 
 int main()
 {
+#if _cpp_lib_to_chars >= 201611L // FP from_char not available otherwise.
   // PR libstdc++/105324
   // std::from_chars() assertion at floating_from_chars.cc:78
   std::string s(512, '1');
   s[1] = '.';
   long double d;
   std::from_chars(s.data(), s.data() + s.size(), d);
+#endif
 }


-- 
Alexandre Oliva, happy hacker                https://FSFLA.org/blogs/lxo/
   Free Software Activist                       GNU Toolchain Engineer
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