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The [[maybe_unused]] attribute works by marking relevant entities as TREE_USED, and DECL_READ_P for vars and parms. But modules streaming typically clears this flag unless reading a definition. This patch sets it back again when we see this attribute applied to a parameter. PR c++/124483 gcc/cp/ChangeLog: * module.cc (trees_in::fn_parms_init): Set TREE_USED and DECL_READ_P for parameters deliberately marked unused. gcc/testsuite/ChangeLog: * g++.dg/modules/attrib-4_a.C: New test. * g++.dg/modules/attrib-4_b.C: New test. Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com> Reviewed-by: Jason Merrill <jason@redhat.com>
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