[llvm] [NFC] Check for defined(__GNUC__) before use (PR #116076)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-adt

Author: David Truby (DavidTruby)

<details>
<summary>Changes</summary>

This silences some spurious warnings on Windows builds that __GNUC__ is
not defined. These warnings make Windows builds very noisy.


---
Full diff: https://github.com/llvm/llvm-project/pull/116076.diff


1 Files Affected:

- (modified) llvm/include/llvm/ADT/iterator_range.h (+2-1) 


``````````diff
diff --git a/llvm/include/llvm/ADT/iterator_range.h b/llvm/include/llvm/ADT/iterator_range.h
index 6c66def0fcd77b..8e9b22f2d4dfa7 100644
--- a/llvm/include/llvm/ADT/iterator_range.h
+++ b/llvm/include/llvm/ADT/iterator_range.h
@@ -43,7 +43,8 @@ class iterator_range {
   IteratorT begin_iterator, end_iterator;
 
 public:
-#if __GNUC__ == 7 || (__GNUC__ == 8 && __GNUC_MINOR__ < 4)
+#if defined(__GNUC__) &&                                                       \
+    (__GNUC__ == 7 || (__GNUC__ == 8 && __GNUC_MINOR__ < 4))
   // Be careful no to break gcc-7 and gcc-8 < 8.4 on the mlir target.
   // See https://github.com/llvm/llvm-project/issues/63843
   template <typename Container>

``````````

</details>


https://github.com/llvm/llvm-project/pull/116076