libstdc++: Replace stacktrace effective target with feature test

Rmove the dejagnu code for checking whether std::stacktrace is supported
and just use the new dg-require-cpp-feature-test directive to check for
__cpp_lib_stacktrace instead.

libstdc++-v3/ChangeLog:

	* testsuite/19_diagnostics/stacktrace/current.cc: Check for
	__cpp_lib_stacktrace instead of check for stacktrace ET.
	* testsuite/19_diagnostics/stacktrace/entry.cc: Likewise.
	* testsuite/19_diagnostics/stacktrace/hash.cc: Likewise.
	* testsuite/19_diagnostics/stacktrace/output.cc: Likewise.
	* testsuite/19_diagnostics/stacktrace/stacktrace.cc: Likewise.
	* testsuite/19_diagnostics/stacktrace/synopsis.cc: Likewise.
	* testsuite/19_diagnostics/stacktrace/version.cc: Likewise.
	* testsuite/23_containers/vector/debug/assign4_backtrace_neg.cc:
	Likewise.
	* testsuite/lib/libstdc++.exp (check_effective_target_stacktrace):
	Remove.

9 files changed, 8 insertions, 16 deletions

diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/current.cc b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/current.cc
index a27836d..b1af5f7 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/current.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/current.cc
@@ -1,6 +1,6 @@
 // { dg-options "-lstdc++exp" }
 // { dg-do run { target c++23 } }
-// { dg-require-effective-target stacktrace }
+// { dg-require-cpp-feature-test __cpp_lib_stacktrace }
 
 #include <stacktrace>
 #include <memory>
diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/entry.cc b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/entry.cc
index ab016d56..bb348eb 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/entry.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/entry.cc
@@ -1,6 +1,6 @@
 // { dg-options "-lstdc++exp" }
 // { dg-do run { target c++23 } }
-// { dg-require-effective-target stacktrace }
+// { dg-require-cpp-feature-test __cpp_lib_stacktrace }
 
 #include <stacktrace>
 #include "testsuite_hooks.h"
diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc
index 2170509..2176596 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/hash.cc
@@ -1,6 +1,6 @@
 // { dg-options "-lstdc++exp" }
 // { dg-do run { target c++23 } }
-// { dg-require-effective-target stacktrace }
+// { dg-require-cpp-feature-test __cpp_lib_stacktrace }
 
 #include <stacktrace>
 #include <testsuite_allocator.h>
diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/output.cc b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/output.cc
index 67f1e0c..e27aea1 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/output.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/output.cc
@@ -1,6 +1,6 @@
 // { dg-options "-lstdc++exp" }
 // { dg-do run { target c++23 } }
-// { dg-require-effective-target stacktrace }
+// { dg-require-cpp-feature-test __cpp_lib_stacktrace }
 // { dg-add-options no_pch }
 
 #include <stacktrace>
diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/stacktrace.cc b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/stacktrace.cc
index 5dfa769..070c415 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/stacktrace.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/stacktrace.cc
@@ -1,6 +1,6 @@
 // { dg-options "-lstdc++exp" }
 // { dg-do run { target c++23 } }
-// { dg-require-effective-target stacktrace }
+// { dg-require-cpp-feature-test __cpp_lib_stacktrace }
 
 #include <stacktrace>
 #include "testsuite_allocator.h"
diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/synopsis.cc b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/synopsis.cc
index 9e775b8..b99d382 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/synopsis.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/synopsis.cc
@@ -1,5 +1,5 @@
 // { dg-do compile { target c++23 } }
-// { dg-require-effective-target stacktrace }
+// { dg-require-cpp-feature-test __cpp_lib_stacktrace }
 // { dg-require-normal-namespace "" }
 // { dg-add-options no_pch }
 
diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/version.cc b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/version.cc
index 21c2d48..1fc7722 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/version.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/version.cc
@@ -1,5 +1,5 @@
 // { dg-do preprocess { target c++23 } }
-// { dg-require-effective-target stacktrace }
+// { dg-require-cpp-feature-test __cpp_lib_stacktrace }
 // { dg-add-options no_pch }
 
 #include <version>
diff --git a/libstdc++-v3/testsuite/23_containers/vector/debug/assign4_backtrace_neg.cc b/libstdc++-v3/testsuite/23_containers/vector/debug/assign4_backtrace_neg.cc
index 43a82fb..2f7238c 100644
--- a/libstdc++-v3/testsuite/23_containers/vector/debug/assign4_backtrace_neg.cc
+++ b/libstdc++-v3/testsuite/23_containers/vector/debug/assign4_backtrace_neg.cc
@@ -1,6 +1,6 @@
 // { dg-do run { xfail *-*-* } }
 // { dg-options "-D_GLIBCXX_DEBUG_BACKTRACE -lstdc++exp" }
-// { dg-require-effective-target stacktrace }
+// { dg-require-cpp-feature-test __cpp_lib_stacktrace }
 
 #include <debug/vector>
 #include <debug/checks.h>
diff --git a/libstdc++-v3/testsuite/lib/libstdc++.exp b/libstdc++-v3/testsuite/lib/libstdc++.exp
index 2b31c95..67a63f5 100644
--- a/libstdc++-v3/testsuite/lib/libstdc++.exp
+++ b/libstdc++-v3/testsuite/lib/libstdc++.exp
@@ -1570,14 +1570,6 @@ proc check_effective_target_std_allocator_new { } {
     }]
 }
 
-# Return 1 if libstdc++ was built as --enable-libstdcxx-backtrace
-proc check_effective_target_stacktrace { } {
-    return [check_v3_target_prop_cached et_stacktrace {
-	set cond "_GLIBCXX_HAVE_STACKTRACE && _GLIBCXX_HOSTED"
-	return [v3_check_preprocessor_condition stacktrace $cond]
-    }]
-}
-
 # Return 1 if RTTI is enabled by the current test flags.
 proc check_effective_target_rtti { } {
     return [check_v3_target_prop_cached et_rtti {