Code generation for inline Clang functions #5405
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This was referenced May 2, 2025
github-merge-queue bot
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May 9, 2025
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.
github-merge-queue bot
pushed a commit
that referenced
this issue
May 21, 2025
This requires:
* Making `FunctionDecl` mutable since generating code
(`HandleTopLevelDecl()`) requires a mutable declaration and since we
manually add `used` attribute to force code generation.
* Passing the file system to `Lower` since it's needed by Clang code
generation.
* Creating an internal Clang LLVM module and link it against the Carbon
LLVM module.
Demo:
```c++
// hello_world.h
extern int puts;
inline void hello_world() {
((int (*)(const char*))&puts)("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
$ ./demo
hello world
```
Based on #5406.
Part of #5405.
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