Series tested on x86_64-pc-linux-gnu, does this look OK for trunk only?
-- >8 --
This FTM is like __cpp_explicit_this_parameter but is also defined
in earlier C++ modes if deducing this is supported as an extension
by the compiler. Currently only GCC supports this, Clang doesn't.
libstdc++-v3/ChangeLog:
* include/bits/c++config (_GLIBCXX_EXPLICIT_THIS_PARAMETER):
New.
---
libstdc++-v3/include/bits/c++config | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/libstdc++-v3/include/bits/c++config
b/libstdc++-v3/include/bits/c++config
index eec3a4a499dd..e6d8f186d0d4 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -927,6 +927,13 @@ namespace __gnu_cxx
# define _GLIBCXX_USE_BUILTIN_TRAIT(BT) 0
#endif
+// Whether deducing this is usable either officially, if in C++23 mode, or
+// as an extension (Clang doesn't support the latter).
+#if __cpp_explicit_this_parameter \
+ || (__cplusplus >= 201103L && __GNUC__ >= 14 && !defined(_GLIBCXX_CLANG))
+# define _GLIBCXX_EXPLICIT_THIS_PARAMETER 202110L
+#endif
+
// Mark code that should be ignored by the compiler, but seen by Doxygen.
#define _GLIBCXX_DOXYGEN_ONLY(X)
--
2.51.0.491.g4b71b29477
