[gcc r12-9981] libstdc++: std::stacktrace tweaks

[gcc r12-9981] libstdc++: std::stacktrace tweaks

[Jonathan Wakely]

https://gcc.gnu.org/g:c665769c90f6e3844e6aad7b183480dfe2e7d8cc

commit r12-9981-gc665769c90f6e3844e6aad7b183480dfe2e7d8cc
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Nov 15 09:17:49 2023 +0000

    libstdc++: std::stacktrace tweaks
    
    Fix a typo in a string literal and make the new hash.cc test gracefully
    handle missing stacktrace data (see PR 112541).
    
    libstdc++-v3/ChangeLog:
    
            * include/std/stacktrace (basic_stacktrace::at): Fix class name
            in exception message.
            * testsuite/19_diagnostics/stacktrace/hash.cc: Do not fail if
            current() returns a non-empty stacktrace.
    
    (cherry picked from commit cbd0fe22a5ced9751d2450dc4fd6fe3525c2fc02)

Diff:
---
 libstdc++-v3/include/std/stacktrace                      | 2 +-
 libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/libstdc++-v3/include/std/stacktrace b/libstdc++-v3/include/std/stacktrace
index eb376513358..13105eab8ee 100644
--- a/libstdc++-v3/include/std/stacktrace
+++ b/libstdc++-v3/include/std/stacktrace
@@ -487,7 +487,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       at(size_type __n) const
       {
 	if (__n >= size())
-	  __throw_out_of_range("basic_stack_trace::at: bad frame number");
+	  __throw_out_of_range("basic_stacktrace::at: bad frame number");
 	return begin()[__n];
       }
 
diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc
index cf18476f2a7..a2f61e49981 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc
@@ -12,9 +12,10 @@ test_hash()
   using Alloc = __gnu_test::uneq_allocator<std::stacktrace_entry>;
   using S = std::basic_stacktrace<Alloc>;
   S s;
+  S cur = S::current();
   std::size_t h = std::hash<S>()(s);
-  std::size_t h2 = std::hash<S>()(S::current());
-  VERIFY( h != h2 );
+  std::size_t h2 = std::hash<S>()(cur);
+  VERIFY( cur.empty() == (h == h2) );
 }
 
 int main()