[PyTorch] Unbreak C10_ALWAYS_INLINE_ATTRIBUTE on MSVC (#139363)

swolchok · pytorchmergebot · commit 73fde0d94088 · 2024-10-31T07:40:05.000Z
At least one recent version refuses to accept it on a lambda, so disable. Differential Revision: [D65250256](https://our.internmc.facebook.com/intern/diff/D65250256/) **NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D65250256/)! Pull Request resolved: #139363 Approved by: https://github.com/ngimel, https://github.com/malfet
diff --git a/c10/macros/Macros.h b/c10/macros/Macros.h
@@ -217,7 +217,9 @@ using namespace c10::xpu;
 // Unlike C10_ALWAYS_INLINE, C10_ALWAYS_INLINE_ATTRIBUTE can be used
 // on a lambda.
 #if defined(_MSC_VER)
-#define C10_ALWAYS_INLINE_ATTRIBUTE [[msvc::forceinline]]
+// MSVC 14.39 is reasonably recent and doesn't like
+// [[msvc::forceinline]] on a lambda, so don't try to use it.
+#define C10_ALWAYS_INLINE_ATTRIBUTE
 #elif __has_attribute(always_inline) || defined(__GNUC__)
 #define C10_ALWAYS_INLINE_ATTRIBUTE __attribute__((__always_inline__))
 #else
