[PATCH] Make BUILD_BUG_ON fail at compile time.
Force a compiler error instead of a link error, because they are easier to track down. Idea stolen from code by Jan Beulich <jbeulich@novell.com> If the argument to BUILD_BUG_ON evaluates to non-zero the compiler will do: t.c:6: error: size of array `type name' is negative (surprised that gcc doesn't have an extension for this) Signed-off-by: "Andi Kleen" <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -307,8 +307,8 @@ struct sysinfo {
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char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
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};
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extern void BUILD_BUG(void);
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#define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
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/* Force a compilation error if condition is false */
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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
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#ifdef CONFIG_SYSCTL
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extern int randomize_va_space;
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