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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/112467] [14 Regression] libstdc++ fails to build on
 clang: bits/stl_bvector.h:189:23: error: '__assume__' attribute cannot be
 applied to a statement
Date: Fri, 10 Nov 2023 21:05:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112467

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu=
.org
             Status|NEW                         |ASSIGNED

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This seems to work:

--- a/libstdc++-v3/include/bits/stl_bvector.h
+++ b/libstdc++-v3/include/bits/stl_bvector.h
@@ -185,8 +185,10 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
     void
     _M_assume_normalized() const
     {
+#if __has_attribute(__assume__) && !defined(__clang__)
       unsigned int __ofst =3D _M_offset;
       __attribute__ ((__assume__ (__ofst < unsigned(_S_word_bit))));
+#endif
     }

     _GLIBCXX20_CONSTEXPR=