/usr/lib/klibc/include/alloca.h is in libklibc-dev 1.5.25-1ubuntu2.
This file is owned by root:root, with mode 0o664.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | /*
* alloca.h
*
* Just call the builtin alloca() function
*/
#ifndef _ALLOCA_H
#define _ALLOCA_H
#define alloca(size) __builtin_alloca(size)
#endif /* _ALLOCA_H */
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