--- 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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<tr><td><span title='2023-09-08 18:53:46 +0800'>2023-09-08</span></td><td><a href='/guix/commit/gnu/packages/patches/ganeti-relax-dependencies.patch?id=b41ea5dcd4a70af3b5efdcac939b56a0e2243a69'>gnu: ganeti: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/ganeti-lens-compat.patch,
gnu/packages/patches/ganeti-procps-compat.patch,
gnu/packages/patches/ganeti-relax-dependencies.patch,
gnu/packages/patches/ganeti-reorder-arbitrary-definitions.patch,
gnu/packages/patches/ganeti-template-haskell-2.17.patch,
gnu/packages/patches/ganeti-template-haskell-2.18.patch: New files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/virtualization.scm (ganeti)[source](patches): Add them.
</span></span></td><td>Marius Bakke</td></tr>