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Fix crash exporting a Carbon function to C++ without a code generator. (#7619)

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We can't rely on a `clang::CodeGenerator` existing when compiling C++
code; we don't build one unless we're actually emitting code for the
current file any more.
This commit is contained in:
Richard Smith
2026-08-07 18:06:36 +00:00
committed by GitHub
parent 7e861cd3c0
commit 06a056d795
3 changed files with 51 additions and 4 deletions
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toolchain/lower/testdata/interop/cpp/function/export/call_not_emitted.carbon
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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/destroy.carbon
// EXTRA-ARGS: --output=%t --output-last-input-only
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/function/export/call_not_emitted.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/function/export/call_not_emitted.carbon
// --- not_emitted.carbon
library "[[@TEST_NAME]]";
import Cpp;
class C {}
fn F(c: C);
// This CppFile is compiled without a Clang CodeGenerator. Ensure this doesn't
// crash.
inline Cpp '''
void G() { Carbon::F(Carbon::C()); }
''';
// --- emitted.carbon
library "[[@TEST_NAME]]";
import library "not_emitted";
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'emitted.carbon'
// CHECK:STDOUT: source_filename = "emitted.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!0}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !1 = !DIFile(filename: "emitted.carbon", directory: "")
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: