/usr/include/newlib/alloca.h is in libnewlib-dev 2.4.0.20160527-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /* libc/include/alloca.h - Allocate memory on stack */
/* Written 2000 by Werner Almesberger */
/* Rearranged for general inclusion by stdlib.h.
2001, Corinna Vinschen <vinschen@redhat.com> */
#ifndef _NEWLIB_ALLOCA_H
#define _NEWLIB_ALLOCA_H
#include "_ansi.h"
#include <sys/reent.h>
#undef alloca
#ifdef __GNUC__
#define alloca(size) __builtin_alloca(size)
#else
void * _EXFUN(alloca,(size_t));
#endif
#endif
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