https://gcc.gnu.org/g:ca554581288fc27559df8150c1a5a915b915bc2b
commit r16-5003-gca554581288fc27559df8150c1a5a915b915bc2b Author: Jason Merrill <[email protected]> Date: Mon Nov 3 17:51:38 2025 +0300 c++: modules and deprecated namespaces 20_util/rel_ops.cc was failing because the gcm didn't represent [[deprecated]] on a namespace. Are there any other attributes we're missing? gcc/cp/ChangeLog: * module.cc (module_state::write_namespaces): Handle TREE_DEPRECATED. (module_state::read_namespaces): Likewise. gcc/testsuite/ChangeLog: * g++.dg/modules/namespace-15_a.C: New test. * g++.dg/modules/namespace-15_b.C: New test. Diff: --- gcc/cp/module.cc | 11 +++++++++-- gcc/testsuite/g++.dg/modules/namespace-15_a.C | 9 +++++++++ gcc/testsuite/g++.dg/modules/namespace-15_b.C | 5 +++++ 3 files changed, 23 insertions(+), 2 deletions(-) diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc index e0b9efa02b61..b475b07dcb1c 100644 --- a/gcc/cp/module.cc +++ b/gcc/cp/module.cc @@ -17246,13 +17246,16 @@ module_state::write_namespaces (elf_out *to, vec<depset *> spaces, flags |= 4; if (DECL_MODULE_EXPORT_P (ns)) flags |= 8; + if (TREE_DEPRECATED (ns)) + flags |= 16; dump () && dump ("Writing namespace:%u %N%s%s%s%s", b->cluster, ns, flags & 1 ? ", public" : "", flags & 2 ? ", inline" : "", flags & 4 ? ", purview" : "", - flags & 8 ? ", export" : ""); + flags & 8 ? ", export" : "", + flags & 16 ? ", deprecated" : ""); sec.u (b->cluster); sec.u (to->name (DECL_NAME (ns))); write_namespace (sec, b->deps[0]); @@ -17328,7 +17331,8 @@ module_state::read_namespaces (unsigned num) flags & 1 ? ", public" : "", flags & 2 ? ", inline" : "", flags & 4 ? ", purview" : "", - flags & 8 ? ", export" : ""); + flags & 8 ? ", export" : "", + flags & 16 ? ", deprecated" : ""); bool visible_p = ((flags & 8) || ((flags & 1) && (flags & 4) @@ -17349,6 +17353,9 @@ module_state::read_namespaces (unsigned num) DECL_MODULE_EXPORT_P (inner) = true; } + if (flags & 16) + TREE_DEPRECATED (inner) = true; + if (tags) DECL_ATTRIBUTES (inner) = tree_cons (get_identifier ("abi_tag"), tags, DECL_ATTRIBUTES (inner)); diff --git a/gcc/testsuite/g++.dg/modules/namespace-15_a.C b/gcc/testsuite/g++.dg/modules/namespace-15_a.C new file mode 100644 index 000000000000..7c0c0e684e21 --- /dev/null +++ b/gcc/testsuite/g++.dg/modules/namespace-15_a.C @@ -0,0 +1,9 @@ +// Test that namespace deprecation is represented in the gcm. + +// { dg-additional-options "-fmodules" } + +export module M; + +export { + namespace [[deprecated]] N { } +} diff --git a/gcc/testsuite/g++.dg/modules/namespace-15_b.C b/gcc/testsuite/g++.dg/modules/namespace-15_b.C new file mode 100644 index 000000000000..5128e826602a --- /dev/null +++ b/gcc/testsuite/g++.dg/modules/namespace-15_b.C @@ -0,0 +1,5 @@ +// { dg-additional-options -fmodules } + +import M; + +using namespace N; // { dg-warning "deprecated" }
