[PATCH][libstdc++]: backport inline keyword on std::find

[Tamar Christina]

Hi All,

This is a backport version of the same patch as
https://gcc.gnu.org/pipermail/gcc-patches/2024-December/671618.html

for the release branches.  I'd like to backport this to GCC 14,13 and 12 where
the first regression showed up.  I am however aware that GCC 12 is going to
get it's last release soon and as such a backport to 12 may not be desirable
for a non correctness fix.

If that is the case I would be happy with just 13 and 14.

I've benchmarked the patch on the branches and see the regressions go away to
what they were in GCC 11.

Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.

Ok for GCC-14 and GCC-13?

Thanks,
Tamar

libstdc++-v3/ChangeLog:

        * include/bits/hashtable.h (find): Add inline keyword.

---
diff --git a/libstdc++-v3/include/bits/hashtable.h 
b/libstdc++-v3/include/bits/hashtable.h
index 
834288c747c28e8625d9d8db387e6abe719b6c87..f5f421d2fd3218d827d673cf7dd1ec9cd9495982
 100644
--- a/libstdc++-v3/include/bits/hashtable.h
+++ b/libstdc++-v3/include/bits/hashtable.h
@@ -1723,7 +1723,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
           typename _ExtractKey, typename _Equal,
           typename _Hash, typename _RangeHash, typename _Unused,
           typename _RehashPolicy, typename _Traits>
-    auto
+    auto inline
     _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
               _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::
     find(const key_type& __k)
@@ -1746,7 +1746,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
           typename _ExtractKey, typename _Equal,
           typename _Hash, typename _RangeHash, typename _Unused,
           typename _RehashPolicy, typename _Traits>
-    auto
+    auto inline
     _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
               _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::
     find(const key_type& __k) const




-- 

diff --git a/libstdc++-v3/include/bits/hashtable.h b/libstdc++-v3/include/bits/hashtable.h
index 834288c747c28e8625d9d8db387e6abe719b6c87..f5f421d2fd3218d827d673cf7dd1ec9cd9495982 100644
--- a/libstdc++-v3/include/bits/hashtable.h
+++ b/libstdc++-v3/include/bits/hashtable.h
@@ -1723,7 +1723,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	   typename _ExtractKey, typename _Equal,
 	   typename _Hash, typename _RangeHash, typename _Unused,
 	   typename _RehashPolicy, typename _Traits>
-    auto
+    auto inline
     _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
 	       _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::
     find(const key_type& __k)
@@ -1746,7 +1746,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	   typename _ExtractKey, typename _Equal,
 	   typename _Hash, typename _RangeHash, typename _Unused,
 	   typename _RehashPolicy, typename _Traits>
-    auto
+    auto inline
     _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
 	       _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::
     find(const key_type& __k) const