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6e72370fd7
This imports licensing clarifications and updates as discussed on
samba-technical ("Subject: Re: ccan code breaks older build farm
systems").
In particular, the recent version have per-file license markers, and
some modules are relicenced more liberally: in particular Simo pointed
out that htable was GPL, and indirectly included by libtdb2, which
would have made that GPL as well.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Autobuild-User: Rusty Russell <rusty@rustcorp.com.au>
Autobuild-Date: Mon Jul 25 12:03:40 CEST 2011 on sn-devel-104
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* Licensed under LGPLv2.1+ - see LICENSE file for details */
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#ifndef CCAN_BUILD_ASSERT_H
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#define CCAN_BUILD_ASSERT_H
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/**
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* BUILD_ASSERT - assert a build-time dependency.
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* @cond: the compile-time condition which must be true.
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*
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* Your compile will fail if the condition isn't true, or can't be evaluated
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* by the compiler. This can only be used within a function.
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*
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* Example:
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* #include <stddef.h>
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* ...
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* static char *foo_to_char(struct foo *foo)
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* {
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* // This code needs string to be at start of foo.
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* BUILD_ASSERT(offsetof(struct foo, string) == 0);
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* return (char *)foo;
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* }
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*/
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#define BUILD_ASSERT(cond) \
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do { (void) sizeof(char [1 - 2*!(cond)]); } while(0)
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/**
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* BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
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* @cond: the compile-time condition which must be true.
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*
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* Your compile will fail if the condition isn't true, or can't be evaluated
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* by the compiler. This can be used in an expression: its value is "0".
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*
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* Example:
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* #define foo_to_char(foo) \
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* ((char *)(foo) \
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* + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
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*/
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#define BUILD_ASSERT_OR_ZERO(cond) \
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(sizeof(char [1 - 2*!(cond)]) - 1)
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#endif /* CCAN_BUILD_ASSERT_H */
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