From: Inaky Perez-Gonzalez <[email protected]>
These have been stolen from the Linux kernel source; come pretty handy
to make build-time consistency checks and thus avoid run-time
surprises.
---
src/util.h | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/src/util.h b/src/util.h
index 2835b76..cf34b67 100644
--- a/src/util.h
+++ b/src/util.h
@@ -77,3 +77,32 @@ unsigned char *pack_7bit(const unsigned char *in, long len,
int byte_offset,
long *items_written, unsigned char terminator);
char *sim_string_to_utf8(const unsigned char *buffer, int length);
+
+/*
+ * Build time consistency checks
+ *
+ * Stolen from the Linux kernel 2.6.35-rc; as most taken from the
+ * Linux kernel, this is licensed GPL v2 or newer.
+ */
+
+/* Force a compilation error if condition is true */
+#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
+
+/* Force a compilation error if condition is constant and true */
+#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
+
+/* Force a compilation error if a constant expression is not a power of 2 */
+#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
+ BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
+
+/* Force a compilation error if condition is true, but also produce a
+ result (of value 0 and type size_t), so the expression can be used
+ e.g. in a structure initializer (or where-ever else comma expressions
+ aren't permitted). */
+#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
+#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
+
+/*
+ * End of code stolen from the Linux kernel 2.6.35-rc. From now, code
+ * is GPL v2 only.
+ */
--
1.6.6.1
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