[clang] [Driver] Remove extraneous c_str() (NFC) (PR #167156)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

Note that addMultilibFlag takes StringRef for its second parameter.

Identified with readability-redundant-string-cstr.


---
Full diff: https://github.com/llvm/llvm-project/pull/167156.diff


1 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Gnu.cpp (+2-2) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
index 7616076847a2c..2dd8cc8422cd7 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -1750,11 +1750,11 @@ static void findRISCVBareMetalMultilibs(const Driver &D,
   std::string MArch = tools::riscv::getRISCVArch(Args, TargetTriple);
   for (auto Element : RISCVMultilibSet) {
     addMultilibFlag(MArch == Element.march,
-                    Twine("-march=", Element.march).str().c_str(), Flags);
+                    Twine("-march=", Element.march).str(), Flags);
     if (!Added_ABIs.count(Element.mabi)) {
       Added_ABIs.insert(Element.mabi);
       addMultilibFlag(ABIName == Element.mabi,
-                      Twine("-mabi=", Element.mabi).str().c_str(), Flags);
+                      Twine("-mabi=", Element.mabi).str(), Flags);
     }
   }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/167156