libstdc++: Do not use assume attribute for Clang [PR112467]

Clang has an 'assume' attribute, but it's a function attribute not a
statement attribute. The recently-added use of the statement form causes
an error with Clang.

libstdc++-v3/ChangeLog:

	PR libstdc++/112467
	* include/bits/stl_bvector.h (_M_assume_normalized): Do not use
	statement form of assume attribute for Clang.

diff --git a/libstdc++-v3/include/bits/stl_bvector.h b/libstdc++-v3/include/bits/stl_bvector.h
index 2b91af2005f2d652f7b64ed7e2a39b509eac03a3..64f04c1f4f5996f91e9c05646ed9d98a5e01632f 100644 (file)
--- 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 = _M_offset;
       __attribute__ ((__assume__ (__ofst < unsigned(_S_word_bit))));
+#endif
     }
 
     _GLIBCXX20_CONSTEXPR