https://github.com/hw-1 created https://github.com/llvm/llvm-project/pull/77031

fix bug with PCH check failed, detail with 
https://github.com/llvm/llvm-project/issues/76923

>From 50e69eac786a646491e278478bb096e361d6c4c1 Mon Sep 17 00:00:00 2001
From: hw-1 <8053554+h...@users.noreply.github.com>
Date: Fri, 5 Jan 2024 09:15:52 +0800
Subject: [PATCH] Update Clang.cpp

fix bug with PCH check failed, detail with 
https://github.com/llvm/llvm-project/issues/76923
---
 clang/lib/Driver/ToolChains/Clang.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp 
b/clang/lib/Driver/ToolChains/Clang.cpp
index 2d8ef841d4f6be..bb8b496dbfe5fc 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -951,7 +951,7 @@ static void handleAMDGPUCodeObjectVersionOptions(const 
Driver &D,
 static bool hasClangPchSignature(const Driver &D, StringRef Path) {
   if (llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> MemBuf =
           D.getVFS().getBufferForFile(Path))
-    return (*MemBuf)->getBuffer().starts_with("CPCH");
+    return (*MemBuf)->getBuffer().substr(0x500,-1).starts_with("CPCH");
   return false;
 }
 

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