[gcc r13-5372] c++: Fix up mangling of static lambdas [PR108525]

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:9d4c00cdaccc3decd07740e817387ce844ef3ac9

commit r13-5372-g9d4c00cdaccc3decd07740e817387ce844ef3ac9
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Jan 25 15:13:30 2023 +0100

    c++: Fix up mangling of static lambdas [PR108525]
    
    Before the P1169R4 changes, operator () of a lambda was
    always a method, so it was fine to pass method_p = 1 unconditionally,
    but it isn't always the case, so this patch adds a check for whether
    it is a method or nor.
    
    2023-01-25  Jakub Jelinek  <jakub@redhat.com>
    
            PR c++/108525
            * mangle.cc (write_closure_type_name): Don't assume all
            lambda operator() fns are methods.
    
            * g++.dg/cpp23/static-operator-call5.C: New test.

Diff:
---
 gcc/cp/mangle.cc                                   | 2 +-
 gcc/testsuite/g++.dg/cpp23/static-operator-call5.C | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/mangle.cc b/gcc/cp/mangle.cc
index 62e9f9fba6e..f2cda3be2cf 100644
--- a/gcc/cp/mangle.cc
+++ b/gcc/cp/mangle.cc
@@ -1816,7 +1816,7 @@ write_closure_type_name (const tree type)
       if (abi_warn_or_compat_version_crosses (18))
 	G.need_abi_warning = true;
 
-  write_method_parms (parms, /*method_p=*/1, fn);
+  write_method_parms (parms, TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE, fn);
   write_char ('E');
   if ((LAMBDA_EXPR_SCOPE_SIG_DISCRIMINATOR (lambda)
        != LAMBDA_EXPR_SCOPE_ONLY_DISCRIMINATOR (lambda))
diff --git a/gcc/testsuite/g++.dg/cpp23/static-operator-call5.C b/gcc/testsuite/g++.dg/cpp23/static-operator-call5.C
index ae022d0b971..ecbb843ef3c 100644
--- a/gcc/testsuite/g++.dg/cpp23/static-operator-call5.C
+++ b/gcc/testsuite/g++.dg/cpp23/static-operator-call5.C
@@ -1,3 +1,8 @@
+// PR c++/108525
+// { dg-do compile { target c++23 } }
+
+auto b = [](...) static { return 1; };
+auto foo () { return b (); }
 // PR c++/108526
 // { dg-do compile { target c++23 } }