| Issue |
57289
|
| Summary |
[C++20] [Modules] Enable to compile demo examples in one go
|
| Labels |
c++20,
clang:driver,
clang:modules
|
| Assignees |
|
| Reporter |
ChuanqiXu9
|
See https://discourse.llvm.org/t/make-command-line-support-for-c-20-module-uniform-with-gcc/59144 for a completed example.
Simply, for a hello world example:
```C++
// say_hello.cpp
module;
#include <iostream>
#include <string_view>
export module Hello;
export void SayHello(std::string_view const &name)
{
std::cout << "Hello " << name << "!\n";
}
// main.cpp
#include <string_view>
import Hello;
int main() {
SayHello("world");
return 0;
}
```
The GCC could compile it in one go:
```
g++ -std=c++20 -fmodules-ts say_hello.cpp main.cpp
```
But clang need to compile it in two steps at least:
```
clang++ -std=c++20 --precompile say_hello.cpp -o Hello.pcm
clang++ -std=c++20 -fprebuilt-module-path=. main.cpp Hello.pcm
```
So in this demo example, the command line interface of GCC is slightly more friendly than Clang.
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