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We currently declare __builtin_source_location with a const void* return type instead of the actual type const std::source_location::__impl*, and later when folding this builtin we obtain the actual type via name lookup. But the below testcase demonstrates this approach seems to interact poorly with modules, since we may import an entity that uses std::source_location::current() in its default argument (or DMI) without necessarily importing <source_location>, and thus the name lookup for std::source_location will fail at the call site (when using the default argument) unless we also import <source_location>. This patch fixes this by instead initially declaring the builtin with an auto return type and updating it appropriately upon its first use (in standard code the first/only use would be in the definition of std::source_location). Thus when folding calls to this builtin we can get at its return type through the type of the CALL_EXPR and avoid needing to do a name lookup. PR c++/100881 gcc/cp/ChangeLog: * constexpr.cc (cxx_eval_builtin_function_call): Adjust calls to fold_builtin_source_location. * cp-gimplify.cc (cp_gimplify_expr): Likewise. (cp_fold): Likewise. (get_source_location_impl_type): Remove location_t parameter and adjust accordingly. No longer static. (fold_builtin_source_location): Take a CALL_EXPR tree instead of a location and obtain the impl type from its return type. * cp-tree.h (enum cp_tree_index): Remove CPTI_SOURCE_LOCATION_IMPL enumerator. (source_location_impl): Remove. (fold_builtin_source_location): Adjust parameter type. (get_source_location_impl_type): Declare. * decl.cc (cxx_init_decl_processing): Declare __builtin_source_location with auto return type instead of const void*. (require_deduced_type): Update the return type of __builtin_source_location. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/srcloc3.C: Adjust expected note s/evaluating/using. * g++.dg/cpp2a/srcloc4.C: Likewise. * g++.dg/cpp2a/srcloc5.C: Likewise. * g++.dg/cpp2a/srcloc6.C: Likewise. * g++.dg/cpp2a/srcloc7.C: Likewise. * g++.dg/cpp2a/srcloc8.C: Likewise. * g++.dg/cpp2a/srcloc9.C: Likewise. * g++.dg/cpp2a/srcloc10.C: Likewise. * g++.dg/cpp2a/srcloc11.C: Likewise. * g++.dg/cpp2a/srcloc12.C: Likewise. * g++.dg/cpp2a/srcloc13.C: Likewise. * g++.dg/modules/pr100881_a.C: New test. * g++.dg/modules/pr100881_b.C: New test.
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