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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
50 lines
1.3 KiB
Plaintext
50 lines
1.3 KiB
Plaintext
#include <stdio.h>
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#include <string.h>
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#include "config.h"
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/**
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* build_assert - routines for build-time assertions
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*
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* This code provides routines which will cause compilation to fail should some
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* assertion be untrue: such failures are preferable to run-time assertions,
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* but much more limited since they can only depends on compile-time constants.
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*
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* These assertions are most useful when two parts of the code must be kept in
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* sync: it is better to avoid such cases if possible, but seconds best is to
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* detect invalid changes at build time.
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*
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* For example, a tricky piece of code might rely on a certain element being at
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* the start of the structure. To ensure that future changes don't break it,
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* you would catch such changes in your code like so:
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*
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* Example:
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* #include <stddef.h>
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* #include <ccan/build_assert/build_assert.h>
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*
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* struct foo {
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* char string[5];
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* int x;
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* };
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*
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* static char *foo_string(struct foo *foo)
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* {
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* // This trick requires that the string be first in the structure
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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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* License: Public domain
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* Author: Rusty Russell <rusty@rustcorp.com.au>
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*/
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int main(int argc, char *argv[])
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{
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if (argc != 2)
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return 1;
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if (strcmp(argv[1], "depends") == 0)
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/* Nothing. */
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return 0;
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return 1;
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}
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