We already suppress various warnings for code that would be tautological if
written directly, but not when it's the result of template substitution. It
seems we need to do this for -Waddress as well.
PR c++/105885
gcc/cp/ChangeLog:
* pt.cc (tsubst_copy_and_build): Also suppress -Waddress for
comparison of dependent operands.
gcc/testsuite/ChangeLog:
* g++.dg/cpp1z/constexpr-if37.C: New test.
warning_sentinel s2(warn_div_by_zero, was_dep);
warning_sentinel s3(warn_logical_op, was_dep);
warning_sentinel s4(warn_tautological_compare, was_dep);
+ warning_sentinel s5(warn_address, was_dep);
tree r = build_x_binary_op
(input_location, TREE_CODE (t),
--- /dev/null
+// PR c++/105885
+// { dg-do compile { target c++17 } }
+// { dg-additional-options -Wall }
+
+int i;
+
+template<const char* ARG = nullptr>
+void test() {
+ if constexpr(ARG == nullptr) {
+ ++i;
+ } else {
+ --i;
+ }
+}
+
+const char CONSTSTR[] = {'\n', '\t', ' ', '\0'};
+
+int main() {
+ test();
+ test<CONSTSTR>();
+}