https://gcc.gnu.org/g:369c439ca19725712426defb441663c529b27dd3
commit r16-440-g369c439ca19725712426defb441663c529b27dd3
Author: Luc Grosheintz <luc.groshei...@gmail.com>
Date: Tue Apr 29 14:46:07 2025 +0200
libstdc++: Setup internal FTM for mdspan.
Uses the FTM infrastructure to create an internal feature testing macro
for partial availability of mdspan; which is then used to hide the
contents of the header mdspan when compiling against a standard prior to
C++23.
libstdc++-v3/ChangeLog:
* include/bits/version.def: Add internal feature testing macro
__glibcxx_mdspan.
* include/bits/version.h: Regenerate.
Signed-off-by: Luc Grosheintz <luc.groshei...@gmail.com>
Diff:
---
libstdc++-v3/include/bits/version.def | 9 +++++++++
libstdc++-v3/include/bits/version.h | 9 +++++++++
2 files changed, 18 insertions(+)
diff --git a/libstdc++-v3/include/bits/version.def
b/libstdc++-v3/include/bits/version.def
index 282667eabda6..f4d3de88bb2b 100644
--- a/libstdc++-v3/include/bits/version.def
+++ b/libstdc++-v3/include/bits/version.def
@@ -999,6 +999,15 @@ ftms = {
};
};
+ftms = {
+ name = mdspan;
+ no_stdname = true; // FIXME: remove
+ values = {
+ v = 1; // FIXME: 202207
+ cxxmin = 23;
+ };
+};
+
ftms = {
name = ssize;
values = {
diff --git a/libstdc++-v3/include/bits/version.h
b/libstdc++-v3/include/bits/version.h
index bb7c0479c723..d5d75cef2de1 100644
--- a/libstdc++-v3/include/bits/version.h
+++ b/libstdc++-v3/include/bits/version.h
@@ -1114,6 +1114,15 @@
#endif /* !defined(__cpp_lib_span) && defined(__glibcxx_want_span) */
#undef __glibcxx_want_span
+#if !defined(__cpp_lib_mdspan)
+# if (__cplusplus >= 202100L)
+# define __glibcxx_mdspan 1L
+# if defined(__glibcxx_want_all) || defined(__glibcxx_want_mdspan)
+# endif
+# endif
+#endif /* !defined(__cpp_lib_mdspan) && defined(__glibcxx_want_mdspan) */
+#undef __glibcxx_want_mdspan
+
#if !defined(__cpp_lib_ssize)
# if (__cplusplus >= 202002L)
# define __glibcxx_ssize 201902L
