[gcc r15-4121] c++: -Wmismatched-tags and modules

[Jason Merrill via Gcc-cvs]

https://gcc.gnu.org/g:bc0ca75123b5996773628981a8bab865440fdf3c

commit r15-4121-gbc0ca75123b5996773628981a8bab865440fdf3c
Author: Jason Merrill <ja...@redhat.com>
Date:   Fri Oct 4 22:23:04 2024 -0400

    c++: -Wmismatched-tags and modules
    
    In Wmismatched-tags-6.C, we try to compare two declarations of the Cp alias
    template, and ICE trying to check whether they're in module purview.  We
    need to check DECL_LANG_SPECIFIC like elsewhere in the compiler.
    
    gcc/cp/ChangeLog:
    
            * decl.cc (duplicate_decls): Only check PURVIEW_P if
            DECL_LANG_SPECIFIC.

Diff:
---
 gcc/cp/decl.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 07fb9855cd20..0c5b5c06a12e 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -2530,7 +2530,7 @@ duplicate_decls (tree newdecl, tree olddecl, bool hiding, 
bool was_hidden)
 
       /* Propagate purviewness and importingness as with
         set_instantiating_module.  */
-      if (modules_p ())
+      if (modules_p () && DECL_LANG_SPECIFIC (new_result))
        {
          if (DECL_MODULE_PURVIEW_P (new_result))
            DECL_MODULE_PURVIEW_P (old_result) = true;