[llvm] [Cygwin] Fix the regression caused by commit c04a05d898982614a2df80d928b97ed4f8c49b60, that, in Cygwin, Clang can't bootstrap. (PR #74978)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: 徐持恒 Xu Chiheng (xu-chiheng)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/74978.diff


1 Files Affected:

- (modified) llvm/lib/Target/X86/X86ISelLowering.cpp (+1) 


``````````diff
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index d69976342fcbd0..a6e03f23c71729 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -18300,6 +18300,7 @@ unsigned X86TargetLowering::getGlobalWrapperKind(
 
   // The following OpFlags under RIP-rel PIC use RIP.
   if (Subtarget.isPICStyleRIPRel() &&
+      !(Subtarget.isTargetWindowsCygwin() && Subtarget.isTargetWin64()) &&
       (OpFlags == X86II::MO_NO_FLAG || OpFlags == X86II::MO_COFFSTUB ||
        OpFlags == X86II::MO_DLLIMPORT))
     return X86ISD::WrapperRIP;

``````````

</details>


https://github.com/llvm/llvm-project/pull/74978