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Implement system header lookup for interop import (#6128)

Browse Source 
Using the toolchain-tasks suggested syntax of:
```
import Cpp header "<system_header.h>";
```
This commit is contained in:
David Blaikie
2025-09-25 15:49:06 +00:00
committed by GitHub
parent e3293a4f1f
commit f194acbf96
2 changed files with 59 additions and 4 deletions
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toolchain/check/testdata/interop/cpp/cpp_namespace.carbon
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+52
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@@ -79,6 +79,25 @@ impl library "[[@TEST_NAME]]";
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: --- cpp_in_inner_namespace.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
@@ -120,3 +139,36 @@ import Cpp library "header.h";
// 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: %.98d: type = cpp_overload_set_type @system_function [concrete]
// CHECK:STDOUT: %empty_struct: %.98d = struct_value () [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 = %.769
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.769: %.98d = cpp_overload_set_value @system_function [concrete = constants.%empty_struct]
// 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: %.98d = name_ref system_function, imports.%.769 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %system_function.call: init %empty_tuple.type = call imports.%system_function.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: