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From: Ammar Faizi <ammarfaizi2@gnuweeb.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: Ammar Faizi <ammarfaizi2@gnuweeb.org>,
	Pavel Begunkov <asml.silence@gmail.com>,
	"Fernanda Ma'rouf" <fernandafmr12@gnuweeb.org>,
	Hao Xu <howeyxu@tencent.com>,
	Alviro Iskandar Setiawan <alviro.iskandar@gnuweeb.org>,
	io-uring Mailing List <io-uring@vger.kernel.org>,
	GNU/Weeb Mailing List <gwml@vger.gnuweeb.org>
Subject: [RFC PATCH v1 2/5] lib: Add `BUILD_BUG_ON()` macro
Date: Mon,  6 Jun 2022 13:12:06 +0700
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The first use case of this macro is for data structure assertion at
compile time. It's like what we do in the io_uring.c in the kernel.

Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
 src/lib.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/lib.h b/src/lib.h
index 5dabd28..40e2817 100644
--- a/src/lib.h
+++ b/src/lib.h
@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <assert.h>
 
 #define __INTERNAL__LIBURING_LIB_H
 #if defined(__x86_64__) || defined(__i386__)
@@ -21,6 +22,9 @@
 #endif
 #undef __INTERNAL__LIBURING_LIB_H
 
+#ifndef BUILD_BUG_ON
+#define BUILD_BUG_ON(EXPR) static_assert(!(EXPR), "!(" #EXPR ") failed")
+#endif
 
 #ifndef offsetof
 #define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD)
-- 
Ammar Faizi