[clang] Enable c++20 modules support for c++23preview in clang-cl (PR #173663)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: ruki (waruqi)

<details>
<summary>Changes</summary>

Fixes https://github.com/llvm/llvm-project/issues/173544

---
Full diff: https://github.com/llvm/llvm-project/pull/173663.diff


1 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Clang.cpp (+1) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 310f3b58a211e..b021b27ebd7a4 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -7221,6 +7221,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
        Std->containsValue("c++20") || Std->containsValue("gnu++20") ||
        Std->containsValue("c++2b") || Std->containsValue("gnu++2b") ||
        Std->containsValue("c++23") || Std->containsValue("gnu++23") ||
+       Std->containsValue("c++23preview") ||
        Std->containsValue("c++2c") || Std->containsValue("gnu++2c") ||
        Std->containsValue("c++26") || Std->containsValue("gnu++26") ||
        Std->containsValue("c++latest") || Std->containsValue("gnu++latest"));

``````````

</details>


https://github.com/llvm/llvm-project/pull/173663