--- a/libstdc++-v3/src/c++17/floating_from_chars.cc
+++ b/libstdc++-v3/src/c++17/floating_from_chars.cc
@@ -495,10 +495,16 @@
 from_chars(const char* first, const char* last, __ieee128& value,
          chars_format fmt) noexcept
 {
+  errc ec = errc::invalid_argument;
+#if _GLIBCXX_USE_CXX11_ABI
   buffer_resource mr;
   pmr::string buf(&mr);
+#else
+  string buf;
+  if (!reserve_string(buf))
+    return make_result(first, 0, {}, ec);
+#endif
   size_t len = 0;
-  errc ec = errc::invalid_argument;
   __try
     {
       if (const char* pat = pattern(first, last, fmt, buf)) [[likely]]
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<div class='path'>path: <a href='/guix/log/?id=883869970cd1ae68df0f01259dfb5ab96c66395a'>root</a>/<a href='/guix/log/etc?id=883869970cd1ae68df0f01259dfb5ab96c66395a'>etc</a>/<a href='/guix/log/etc/hurd-manifest.scm?id=883869970cd1ae68df0f01259dfb5ab96c66395a'>hurd-manifest.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/hurd-manifest.scm?id=883869970cd1ae68df0f01259dfb5ab96c66395a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-12-18 23:16:28 +0100'>2023-12-18</span></td><td><a href='/guix/commit/etc/hurd-manifest.scm?id=32d4f40589e32cbac6549c50962011084f13d9fc'>maint: Build more development packages for GNU/Hurd.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/hurd-manifest.scm: Add Autotools and Guile-related packages.

Change-Id: I6ded9623543a8f5444e9d6bb04284e9ca2aa2dcd
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-09-19 07:26:56 +0200'>2023-09-19</span></td><td><a href='/guix/commit/etc/hurd-manifest.scm?id=7841a624f0c94efbfeb48a5209dbd92575eacc09'>maint: Add gdk-pixbuf to native Hurd manifest.</a><span class='msg-avail'>...<span class='msg-tooltip'>Gdk-pixbuf is a dependency for `guix system reconfigure' and currently also
needs an unreleased glibc patch in order to build.

* etc/hurd-manifest.scm: Add gdk-pixbuf to manifest.
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2023-08-21 10:45:45 +0200'>2023-08-21</span></td><td><a href='/guix/commit/etc/hurd-manifest.scm?id=3c6b6941a2c76c26ebf0c1bfd7f901a22c19dce1'>maint: Add 'etc/hurd-manifest.scm'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/cuirass/hurd-manifest.scm: Move to...
* etc/hurd-manifest.scm: ...here.
* Makefile.am (EXTRA_DIST): Update accordingly.
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>