124a9e08b7
Like we avoid various warnings for seemingly tautological expressions when substituting a template, we should avoid warning for the implicit conversion to bool in an if statement. I considered also doing this for the conditions in loop expressions, but that seems unnecessary, as a loop condition is unlikely to be a constant. The change to finish_if_stmt_cond isn't necessary since dependent_operand_p looks through IMPLICIT_CONV_EXPR, but makes it more constent with e.g. build_x_binary_op that determines the type of an expression and then builds it using the original operands. PR c++/94554 gcc/cp/ChangeLog: * pt.cc (dependent_operand_p): Split out from... (tsubst_copy_and_build): ...here. (tsubst_expr) [IF_STMT]: Use it. * semantics.cc (finish_if_stmt_cond): Keep the pre-conversion condition in the template tree. gcc/testsuite/ChangeLog: * g++.dg/cpp1z/constexpr-if38.C: New test. |
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