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Date: Wed, 17 Aug 2011 16:47:24 +0200
From: Szabolcs Nagy <>
Subject: Re: Compilation error

* Rich Felker <> [2011-08-17 09:39:13 -0400]:
> > (i'm not sure where alloca should go, pcc does not provide it)
> WTF? alloca cannot be implemented as a function. Does gcc provide an
> alloca function?

i'm not sure how it should work but
__alloca is defined in libpcc using simple asm trickery
(modify stackpointer and the values on the stack and return)
so in case of pcc CFLAGS+=-Dalloca=__alloca works

tcc seems to implement alloca similarly in libtcc
but they call it alloca so no define is needed

glibc defines alloca as __builtin_alloca if gcc is used
for compilation otherwise it just provides an extern
declaration for it

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