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Since https://github.com/llvm/llvm-project/commit/ca75ac5f04f2, clang 15 has a new warning about _Generic selection expressions, such as used in math.h: lib/libc/gdtoa/_ldtoa.c:82:10: error: due to lvalue conversion of the controlling expression, association of type 'volatile float' will never be selected because it is qualified [-Werror,-Wunreachable-code-generic-assoc] switch (fpclassify(u.e)) { ^ lib/msun/src/math.h:109:2: note: expanded from macro 'fpclassify' __fp_type_select(x, __fpclassifyf, __fpclassifyd, __fpclassifyl) ^ lib/msun/src/math.h:85:14: note: expanded from macro '__fp_type_select' volatile float: f(x), \ ^ This is because the controlling expression always undergoes lvalue conversion first, dropping any cv-qualifiers. The 'const', 'volatile', and 'volatile const' associations will therefore never be used. MFC after: 1 week Reviewed by: theraven Differential Revision: https://reviews.freebsd.org/D35815 |
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