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>> But when compiled as such:
>>
>> $ gcc -std=c99 foo.c
>> /var/tmp//cc9lV8g8.o(.text+0x28): In function `main':
>> : undefined reference to `alloca'
>
> This is because alloca() is not in the C99 standard, and so GCC takes it 
> out of the namespace when you compile for C99 (alloca() is a built-in 
> GCC function; __builtin_alloca() should always work).

If NetBSD/cobalt (same with pmax - maybe all mipsel?) doesn't compile

$ gcc -std=c99 foo.c

(with the aforementioned alloca() call in foo.c)

...while NetBSD/i386 (and OpenBSD/i386, etc) does, then somebody has an 
error. I see that you've commented on this in the past; would you call 
this a bug on the other systems viz. conformance to c99?

On a related note, shouldn't this bail on compilation, and not on linking?

Take care,
   Kristaps

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