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[XEN PATCH 1/3] xen/compiler: drop alternative unreachable() definition for older GCC
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: nicola.vetrini@xxxxxxxxx
- Date: Wed, 13 Aug 2025 21:12:48 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Wed, 13 Aug 2025 19:14:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
From: Nicola Vetrini <nicola.vetrini@xxxxxxxxx>
The GCC baseline version is 5.1, which supports __builtin_unreachable(),
therefore the alternative definition can be dropped
Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxx>
---
Mentioned in https://gitlab.com/xen-project/xen/-/issues/201
---
xen/include/xen/compiler.h | 4 ----
1 file changed, 4 deletions(-)
diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h
index 735c844d2d15..88bf26bc5109 100644
--- a/xen/include/xen/compiler.h
+++ b/xen/include/xen/compiler.h
@@ -47,11 +47,7 @@
# define cf_check
#endif
-#if (!defined(__clang__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 5))
-#define unreachable() do {} while (1)
-#else
#define unreachable() __builtin_unreachable()
-#endif
/*
* Compilers estimate the size of an asm() block for inlining purposes.
--
2.43.0
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