Supporting the debug mode in freestanding is a non-trivial job, so
instead, as a best-effort, enable assertions, which are light and easy.
libstdc++-v3/ChangeLog:
* include/bits/c++config: When __STDC_HOSTED__ is zero,
disable _GLIBCXX_DEBUG and, if it was set, enable
_GLIBCXX_ASSERTIONS.
* testsuite/lib/libstdc++.exp (check_v3_target_debug_mode):
Include <bits/c++config.h> when determining whether debug is
set, in order to inherit the logic from above
---
libstdc++-v3/include/bits/c++config | 7 +++++++
libstdc++-v3/testsuite/lib/libstdc++.exp | 1 +
2 files changed, 8 insertions(+)
diff --git a/libstdc++-v3/include/bits/c++config
b/libstdc++-v3/include/bits/c++config
index 71f2401402f..13892787e09 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -397,6 +397,13 @@ _GLIBCXX_END_NAMESPACE_VERSION
# define _GLIBCXX_END_INLINE_ABI_NAMESPACE(X) } // inline namespace X
#endif
+// In the case that we don't have a hosted environment, we can't provide the
+// debugging mode. Instead, we do our best and downgrade to assertions.
+#if defined(_GLIBCXX_DEBUG) && !__STDC_HOSTED__
+#undef _GLIBCXX_DEBUG
+#define _GLIBCXX_ASSERTIONS 1
+#endif
+
// Inline namespaces for special modes: debug, parallel.
#if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PARALLEL)
namespace std
diff --git a/libstdc++-v3/testsuite/lib/libstdc++.exp
b/libstdc++-v3/testsuite/lib/libstdc++.exp
index 98512c973fb..490abd108fa 100644
--- a/libstdc++-v3/testsuite/lib/libstdc++.exp
+++ b/libstdc++-v3/testsuite/lib/libstdc++.exp
@@ -1007,6 +1007,7 @@ proc check_v3_target_debug_mode { } {
global cxxflags
return [check_v3_target_prop_cached et_debug_mode {
set code "
+ #include <bits/c++config.h>
#if ! defined _GLIBCXX_DEBUG
# error no debug mode
#endif
--
2.40.0
