Patrick Palka
eef4fa6968
My r11-295 patch for PR68942 didn't consider that the callee of an ADL-eligible function call can be a TEMPLATE_ID_EXPR, and we don't want to disable mark_used when substituting into the template arguments of this TEMPLATE_ID_EXPR because the arguments are clearly used regardless of the outcome of ADL. In the first testcase below, this oversight causes us to trip over the assert in build_call_a for the call to find_index<int> because the function no longer had its TREE_USED bit set from mark_used. So this patch restricts the original fix to disable mark_used only when the callee is a FUNCTION_DECL, which seems to be the only case that matters for PR68942. For instance, in the second testcase below we already don't mark_used the deleted function specialization even before r11-295. gcc/cp/ChangeLog: PR c++/68942 PR c++/100344 * pt.c (tsubst_copy_and_build) <case CALL_EXPR>: Set tf_conv only when the callee is a FUNCTION_DECL. gcc/testsuite/ChangeLog: PR c++/68942 PR c++/100344 * g++.dg/template/call8.C: New test. * g++.dg/template/koenig12a.C: New test.
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