/usr/include/diet/alloca.h is in dietlibc-dev 0.33~cvs20120325-6+deb8u1.
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 | #ifndef _ALLOCA_H
#define _ALLOCA_H
#include <sys/cdefs.h>
#include <sys/types.h>
__BEGIN_DECLS
#ifdef __GNUC__
#define alloca(x) __builtin_alloca(x)
#else
void *alloca(size_t size) __THROW;
#endif
__END_DECLS
#endif
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