[clang] [clang][PP] Add extension to predefine target OS macros (PR #74676)

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github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->

:warning: C/C++ code formatter, clang-format found issues in your code. 
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You can test this locally with the following command:
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``````````bash
git-clang-format --diff 23d402e5b705d98463150302a55623951284b5f2 
2812f69940451b810b8aa9a580e98a4a22a89967 -- 
clang/test/Driver/darwin-fdefine-target-os-macros.c 
clang/include/clang/Lex/PreprocessorOptions.h 
clang/lib/Driver/ToolChains/Darwin.cpp 
clang/lib/Frontend/CompilerInvocation.cpp 
clang/lib/Frontend/InitPreprocessor.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp 
b/clang/lib/Frontend/InitPreprocessor.cpp
index 320894f33f..cb82844808 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -1348,7 +1348,7 @@ static void InitializePredefinedMacros(const TargetInfo 
&TI,
   if (PPOpts.DefineTargetOSMacros) {
     const llvm::Triple &Triple = TI.getTriple();
 #define TARGET_OS(Name, Predicate)                                             
\
-    Builder.defineMacro(#Name, Predicate ? "1" : "0");
+  Builder.defineMacro(#Name, Predicate ? "1" : "0");
 #include "clang/Basic/TargetOSMacros.def"
 #undef TARGET_OS
   }

``````````

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https://github.com/llvm/llvm-project/pull/74676
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