[clang] [Frontend] Avoid creating a temporary instance of std::string (NFC) (PR #140326)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

Since getLastArgValue returns StringRef, and the constructor of
SmallString accepts StringRef, we do not need to go through a
temporary instance of std::string.


---
Full diff: https://github.com/llvm/llvm-project/pull/140326.diff


1 Files Affected:

- (modified) clang/lib/Frontend/CompilerInvocation.cpp (+1-2) 


``````````diff
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index fd48e425a5c21..3c23073fc6a8c 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -2055,8 +2055,7 @@ bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
   // The memory profile runtime appends the pid to make this name more unique.
   const char *MemProfileBasename = "memprof.profraw";
   if (Args.hasArg(OPT_fmemory_profile_EQ)) {
-    SmallString<128> Path(
-        std::string(Args.getLastArgValue(OPT_fmemory_profile_EQ)));
+    SmallString<128> Path(Args.getLastArgValue(OPT_fmemory_profile_EQ));
     llvm::sys::path::append(Path, MemProfileBasename);
     Opts.MemoryProfileOutput = std::string(Path);
   } else if (Args.hasArg(OPT_fmemory_profile))

``````````

</details>


https://github.com/llvm/llvm-project/pull/140326