[gcc r16-5988] Revert "c++: Non-inline temploid friends should still be COMDAT [PR122819]"

[Nathaniel Shead]

https://gcc.gnu.org/g:49c4b7328379df066a414535166916bb017033cf

commit r16-5988-g49c4b7328379df066a414535166916bb017033cf
Author: Nathaniel Shead <nathanieloshead@gmail.com>
Date:   Tue Dec 9 23:33:41 2025 +1100

    Revert "c++: Non-inline temploid friends should still be COMDAT [PR122819]"
    
    This reverts commit cf22e30f0cfae65dd012966cab657583e2be667e.

Diff:
---
 gcc/cp/decl.cc                               |  6 +++---
 gcc/cp/decl2.cc                              |  5 +++--
 gcc/cp/semantics.cc                          |  4 +---
 gcc/testsuite/g++.dg/modules/tpl-friend-22.C | 24 ------------------------
 4 files changed, 7 insertions(+), 32 deletions(-)

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 31081b390fae..74c862ec1c7d 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -19750,7 +19750,7 @@ start_preparsed_function (tree decl1, tree attrs, int flags)
 	}
     }
 
-  bool honor_interface = (!DECL_TEMPLOID_INSTANTIATION (decl1)
+  bool honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
 			  /* Implicitly-defined methods (like the
 			     destructor for a class in which no destructor
 			     is explicitly declared) must not be defined
@@ -19781,7 +19781,7 @@ start_preparsed_function (tree decl1, tree attrs, int flags)
   else if (!finfo->interface_unknown && honor_interface)
     {
       if (DECL_DECLARED_INLINE_P (decl1)
-	  || DECL_TEMPLOID_INSTANTIATION (decl1))
+	  || DECL_TEMPLATE_INSTANTIATION (decl1))
 	{
 	  DECL_EXTERNAL (decl1)
 	    = (finfo->interface_only
@@ -19823,7 +19823,7 @@ start_preparsed_function (tree decl1, tree attrs, int flags)
 	DECL_EXTERNAL (decl1) = 0;
 
       if ((DECL_DECLARED_INLINE_P (decl1)
-	   || DECL_TEMPLOID_INSTANTIATION (decl1))
+	   || DECL_TEMPLATE_INSTANTIATION (decl1))
 	  && ! DECL_INTERFACE_KNOWN (decl1))
 	DECL_DEFER_OUTPUT (decl1) = 1;
       else
diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
index 01bf26b1e4f8..8ec9740c8a9e 100644
--- a/gcc/cp/decl2.cc
+++ b/gcc/cp/decl2.cc
@@ -2510,7 +2510,7 @@ vague_linkage_p (tree decl)
       || (TREE_CODE (decl) == FUNCTION_DECL
 	  && DECL_DECLARED_INLINE_P (decl))
       || (DECL_LANG_SPECIFIC (decl)
-	  && DECL_TEMPLOID_INSTANTIATION (decl))
+	  && DECL_TEMPLATE_INSTANTIATION (decl))
       || (VAR_P (decl) && DECL_INLINE_VAR_P (decl)))
     return true;
   else if (DECL_FUNCTION_SCOPE_P (decl))
@@ -5850,7 +5850,8 @@ c_parse_final_cleanups (void)
 	  && !(header_module_p ()
 	       && (DECL_DEFAULTED_FN (decl) || decl_tls_wrapper_p (decl)))
 	  /* Don't complain if the template was defined.  */
-	  && !(DECL_TEMPLOID_INSTANTIATION (decl)
+	  && !((DECL_TEMPLATE_INSTANTIATION (decl)
+		|| DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
 	       && DECL_INITIAL (DECL_TEMPLATE_RESULT
 				(template_for_substitution (decl))))
 	  && warning_at (DECL_SOURCE_LOCATION (decl), 0,
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index b32ab2f0d2b7..331db16f76de 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -5537,9 +5537,7 @@ expand_or_defer_fn_1 (tree fn)
      of the compilation.  Until that point, we do not want the back
      end to output them -- but we do want it to see the bodies of
      these functions so that it can inline them as appropriate.  */
-  if (DECL_DECLARED_INLINE_P (fn)
-      || DECL_IMPLICIT_INSTANTIATION (fn)
-      || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (fn))
+  if (DECL_DECLARED_INLINE_P (fn) || DECL_IMPLICIT_INSTANTIATION (fn))
     {
       if (DECL_INTERFACE_KNOWN (fn))
 	/* We've already made a decision as to how this function will
diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-22.C b/gcc/testsuite/g++.dg/modules/tpl-friend-22.C
deleted file mode 100644
index a77d1cbecad8..000000000000
--- a/gcc/testsuite/g++.dg/modules/tpl-friend-22.C
+++ /dev/null
@@ -1,24 +0,0 @@
-// PR c++/122819
-// { dg-do compile { target *-*-*gnu* } }
-// { dg-additional-options "-fmodules" }
-
-export module M;
-
-template <typename T> struct S;
-void foo(S<float>);
-
-template <typename T> struct S {
-  friend void foo(S) {}
-};
-
-void foo(S<double>);
-
-void use() {
-  foo(S<int>{});
-  foo(S<float>{});
-  foo(S<double>{});
-}
-
-// { dg-final { scan-assembler "_ZW1M3fooS_1SIiE,comdat" } }
-// { dg-final { scan-assembler "_ZW1M3fooS_1SIfE,comdat" } }
-// { dg-final { scan-assembler "_ZW1M3fooS_1SIdE,comdat" } }