[clang] [Clang][Docs] Fix #40293 Add help text to coverage flag (PR #77705)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: widberg (widberg)

<details>
<summary>Changes</summary>

As raised in https://github.com/llvm/llvm-project/issues/40293 `--coverage` does not have help text so it does not show up in `--help`. If you have suggestions to improve the help text I am more than happy to integrate them.

---
Full diff: https://github.com/llvm/llvm-project/pull/77705.diff


1 Files Affected:

- (modified) clang/include/clang/Driver/Options.td (+2-1) 


``````````diff
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 19becba4a5ad83..bc40bfca412c6e 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -1112,7 +1112,8 @@ def config_user_dir_EQ : Joined<["--"], "config-user-dir=">,
   Visibility<[ClangOption, CLOption, DXCOption]>,
   HelpText<"User directory for configuration files">;
 def coverage : Flag<["-", "--"], "coverage">, Group<Link_Group>,
-  Visibility<[ClangOption, CLOption]>;
+  Visibility<[ClangOption, CLOption]>,
+  HelpText<"Compile with gcov code coverage">;
 def cpp_precomp : Flag<["-"], "cpp-precomp">, Group<clang_ignored_f_Group>;
 def current__version : JoinedOrSeparate<["-"], "current_version">;
 def cxx_isystem : JoinedOrSeparate<["-"], "cxx-isystem">, Group<clang_i_Group>,

``````````

</details>


https://github.com/llvm/llvm-project/pull/77705