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Kristaps,

>>>> $ gcc -std=3Dc99 foo.c
>>>> /var/tmp//cc9lV8g8.o(.text+0x28): In function `main':
>>>> : undefined reference to `alloca'

[snip]

> On a related note, shouldn't this bail on compilation, and not on linki=
ng?

Nope. The compiler should issue an "implicit declaration" warning (if
you have warnings turned on) for an missing function, but it's the
linker that will bomb because it can't resolve the reference at all.

It looks like when you use -std=3Dc99, it simply ignores the fact that
"alloca" exists in the (non)standard library, and assumes that you are
trying to use your own method that just happens to be called "alloca".

-chris


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