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Only export each class or namespace to C++ once. (#7042)

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Instead of exporting a class or namespace each time a new C++ name
lookup discovers it, track that we have exported the entity on its name
scope, and if a new name lookup finds the same entity, produce the same
clang declaration.
This commit is contained in:
Richard Smith
2026-04-13 19:43:44 +00:00
committed by GitHub
parent 3cdb159067
commit f31e1685fd
11 changed files with 325 additions and 161 deletions
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toolchain/check/testdata/interop/cpp/function/thunk_ast.carbon
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@@ -12,6 +12,7 @@
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/function/thunk_ast.carbon
// CHECK:STDOUT: TranslationUnitDecl {{0x[a-f0-9]+}} <<invalid sloc>> <invalid sloc>
// CHECK:STDOUT: |-NamespaceDecl {{0x[a-f0-9]+}} <<invalid sloc>> <invalid sloc> Carbon
// --- thunk_required.h
@@ -32,6 +33,7 @@ auto foo(short a) -> void;
// CHECK:STDOUT: |-InternalLinkageAttr {{0x[a-f0-9]+}} <<invalid sloc>> Implicit
// CHECK:STDOUT: `-AsmLabelAttr {{0x[a-f0-9]+}} <col:6> Implicit "_Z3foos.carbon_thunk"
// CHECK:STDOUT: TranslationUnitDecl {{0x[a-f0-9]+}} <<invalid sloc>> <invalid sloc>
// CHECK:STDOUT: |-NamespaceDecl {{0x[a-f0-9]+}} <<invalid sloc>> <invalid sloc> Carbon
// --- import_thunk_required.carbon