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carbon-lang/toolchain/check/testdata/interop/cpp/cpp_namespace.carbon
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Chandler Carruth e7eb3b7b5a Consolidate default Clang argument handling (#6545) 
This unifies the default Clang arguments between the `clang` subcommand,
the `link` subcommand, and the `ClangInvocation` built for C++ interop.

This sets the stage to integrate either pre-built or on-demand runtimes
flags for both of these. However, this PR should have very little
practical difference. The biggest functional change is wrapping the
default arguments in flags to allow unused flags so that we can build a
collection of flags viable across compile and link.
2026-01-03 17:35:29 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/none.carbon
//
// EXTRA-ARGS: --target=aarch64-unknown-linux
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/cpp_namespace.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/cpp_namespace.carbon
// --- header.h
// --- fail_duplicate_cpp_name.carbon
library "[[@TEST_NAME]]";
import Cpp library "header.h";
// CHECK:STDERR: fail_duplicate_cpp_name.carbon:[[@LINE+8]]:11: error: `namespace` introducer should be followed by a name [ExpectedDeclName]
// CHECK:STDERR: namespace Cpp;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_duplicate_cpp_name.carbon:[[@LINE+4]]:11: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
// CHECK:STDERR: namespace Cpp;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
namespace Cpp;
// --- fail_cpp_in_inner_namespace.carbon
library "[[@TEST_NAME]]";
import Cpp library "header.h";
namespace N;
// CHECK:STDERR: fail_cpp_in_inner_namespace.carbon:[[@LINE+8]]:13: error: `.` should be followed by a name [ExpectedDeclNameAfterPeriod]
// CHECK:STDERR: namespace N.Cpp;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_cpp_in_inner_namespace.carbon:[[@LINE+4]]:13: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
// CHECK:STDERR: namespace N.Cpp;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
namespace N.Cpp;
// --- alias.carbon
library "[[@TEST_NAME]]";
import Cpp library "header.h";
//@dump-sem-ir-begin
alias MyCpp = Cpp;
//@dump-sem-ir-end
// --- fail_add_name_to_cpp_namespace.carbon
library "[[@TEST_NAME]]";
import Cpp library "header.h";
// CHECK:STDERR: fail_add_name_to_cpp_namespace.carbon:[[@LINE+8]]:7: error: `class` introducer should be followed by a name [ExpectedDeclName]
// CHECK:STDERR: class Cpp.C {};
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_add_name_to_cpp_namespace.carbon:[[@LINE+4]]:7: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
// CHECK:STDERR: class Cpp.C {};
// CHECK:STDERR: ^~~
// CHECK:STDERR:
class Cpp.C {};
// --- api_and_impl.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
import Cpp library "header.h";
//@dump-sem-ir-end
// --- api_and_impl.impl.carbon
impl library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
import Cpp library "header.h";
//@dump-sem-ir-end
// --- /usr/include/system_header.h
auto system_function() -> void;
// --- system_header.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
import Cpp library "<system_header.h>";
//@dump-sem-ir-end
fn F() {
//@dump-sem-ir-begin
Cpp.system_function();
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %MyCpp: <namespace> = alias_binding MyCpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- api_and_impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %Cpp.import_cpp = import_cpp {
// CHECK:STDOUT: import Cpp "header.h"
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- api_and_impl.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- system_header.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %system_function.cpp_overload_set.type: type = cpp_overload_set_type @system_function.cpp_overload_set [concrete]
// CHECK:STDOUT: %system_function.cpp_overload_set.value: %system_function.cpp_overload_set.type = cpp_overload_set_value @system_function.cpp_overload_set [concrete]
// CHECK:STDOUT: %system_function.type: type = fn_type @system_function [concrete]
// CHECK:STDOUT: %system_function: %system_function.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .system_function = %system_function.cpp_overload_set.value
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %system_function.cpp_overload_set.value: %system_function.cpp_overload_set.type = cpp_overload_set_value @system_function.cpp_overload_set [concrete = constants.%system_function.cpp_overload_set.value]
// CHECK:STDOUT: %system_function.decl: %system_function.type = fn_decl @system_function [concrete = constants.%system_function] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %Cpp.import_cpp = import_cpp {
// CHECK:STDOUT: import Cpp "<system_header.h>"
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %system_function.ref: %system_function.cpp_overload_set.type = name_ref system_function, imports.%system_function.cpp_overload_set.value [concrete = constants.%system_function.cpp_overload_set.value]
// CHECK:STDOUT: %system_function.call: init %empty_tuple.type = call imports.%system_function.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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