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[XEN PATCH 2/3] xen/macros: Drop alternative definition of BUILD_BUG_ON(_ZERO)? for old GCC
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: nicola.vetrini@xxxxxxxxx
- Date: Wed, 13 Aug 2025 21:12:49 +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 19:14:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
From: Nicola Vetrini <nicola.vetrini@xxxxxxxxx>
The toolchain baseline for GCC is 5.1, which supports _Static_assert
in c99 mode
No functional change.
Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxx>
---
Mentioned in https://gitlab.com/xen-project/xen/-/issues/201
---
xen/include/xen/macros.h | 8 --------
1 file changed, 8 deletions(-)
diff --git a/xen/include/xen/macros.h b/xen/include/xen/macros.h
index cd528fbdb127..f9ccde86fb23 100644
--- a/xen/include/xen/macros.h
+++ b/xen/include/xen/macros.h
@@ -40,9 +40,6 @@
#ifndef __ASSEMBLY__
-/* All clang versions supported by Xen have _Static_assert. */
-#if defined(__clang__) || \
- (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
/* Force a compilation error if condition is true */
#define BUILD_BUG_ON(cond) ({ _Static_assert(!(cond), "!(" #cond ")"); })
@@ -54,11 +51,6 @@
*/
#define BUILD_BUG_ON_ZERO(cond) \
(sizeof(struct { char c; _Static_assert(!(cond), "!(" #cond ")"); }) & 0)
-#else
-#define BUILD_BUG_ON_ZERO(cond) \
- (sizeof(struct { unsigned u : !(cond); }) & 0)
-#define BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond))
-#endif
/*
* Force a compilation error. This is for code which, in the normal case,
--
2.43.0
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