[gcc r15-3772] libstdc++: Silence -Wattributes warning in exception_ptr

[Jonathan Wakely]

https://gcc.gnu.org/g:164c1b1f812da5d1e00fc10a415e80f7c508efcb

commit r15-3772-g164c1b1f812da5d1e00fc10a415e80f7c508efcb
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Sep 18 15:41:05 2024 +0100

    libstdc++: Silence -Wattributes warning in exception_ptr
    
    libstdc++-v3/ChangeLog:
    
            * libsupc++/exception_ptr.h (__exception_ptr::_M_safe_bool_dummy):
            Remove __attribute__((const)) from function returning void.

Diff:
---
 libstdc++-v3/libsupc++/exception_ptr.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/libstdc++-v3/libsupc++/exception_ptr.h b/libstdc++-v3/libsupc++/exception_ptr.h
index 7c234ce0bf20..ee977a8a6eac 100644
--- a/libstdc++-v3/libsupc++/exception_ptr.h
+++ b/libstdc++-v3/libsupc++/exception_ptr.h
@@ -151,8 +151,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
 
 #ifdef _GLIBCXX_EH_PTR_COMPAT
       // Retained for compatibility with CXXABI_1.3.
-      void _M_safe_bool_dummy() _GLIBCXX_USE_NOEXCEPT
-	__attribute__ ((__const__));
+      void _M_safe_bool_dummy() _GLIBCXX_USE_NOEXCEPT;
       bool operator!() const _GLIBCXX_USE_NOEXCEPT
 	__attribute__ ((__pure__));
       operator __safe_bool() const _GLIBCXX_USE_NOEXCEPT;