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Add C++ interop inline function tests (#5406)

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This shows that `inline` is ignored and the function definition is not
generated.

Demo:

```c++
// hello_world.h

inline void hello_world() {}
```

```carbon
// main.carbon

library "Main";

import Cpp library "hello_world.h";

fn Run() -> i32 {
  Cpp.hello_world();
  return 0;
}
```

```shell
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link main.o --output=demo
ld.lld: error: undefined symbol: hello_world()
>>> referenced by main.carbon:8
>>>               main.o:(main)
error: linker command failed with exit code 1 (use -v to see invocation)
```

Part of #5405.
This commit is contained in:
Boaz Brickner
2025-05-09 16:33:16 +00:00
committed by GitHub
parent f8443ae09e
commit 2cb0df42e0
2 changed files with 177 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
toolchain/lower/testdata/interop/cpp/function_decl.carbon
Vendored
+46
View File
@@ -8,6 +8,10 @@
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/function_decl.carbon
// ============================================================================
// function_decl
// ============================================================================
// --- function_decl.h
void foo();
@@ -22,6 +26,25 @@ fn MyF() {
Cpp.foo();
}
// ============================================================================
// inline_function_decl
// ============================================================================
// --- inline_function_decl.h
inline void foo() {}
// --- todo_import_inline_function_decl.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline_function_decl.h";
fn MyF() {
// TODO: This should generate the definition of the inline function `foo()`.
Cpp.foo();
}
// CHECK:STDOUT: ; ModuleID = 'import_function_decl.carbon'
// CHECK:STDOUT: source_filename = "import_function_decl.carbon"
// CHECK:STDOUT:
@@ -45,3 +68,26 @@ fn MyF() {
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 7, column: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 6, column: 1, scope: !4)
// CHECK:STDOUT: ; ModuleID = 'todo_import_inline_function_decl.carbon'
// CHECK:STDOUT: source_filename = "todo_import_inline_function_decl.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CMyF.Main() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z3foov(), !dbg !7
// CHECK:STDOUT: ret void, !dbg !8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z3foov()
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "todo_import_inline_function_decl.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !3, line: 6, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 8, column: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 6, column: 1, scope: !4)