/usr/include/x86_64-linux-gnu/libunwind.h is in libunwind-dev 1.2.1-8.
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 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | /* Provide a real file - not a symlink - as it would cause multiarch conflicts
when multiple different arch releases are installed simultaneously. */
#ifndef UNW_REMOTE_ONLY
#if defined __aarch64__
#include "libunwind-aarch64.h"
#elif defined __arm__
# include "libunwind-arm.h"
#elif defined __hppa__
# include "libunwind-hppa.h"
#elif defined __ia64__
# include "libunwind-ia64.h"
#elif defined __mips__
# include "libunwind-mips.h"
#elif defined __powerpc__ && !defined __powerpc64__
# include "libunwind-ppc32.h"
#elif defined __powerpc64__
# include "libunwind-ppc64.h"
#elif defined __sh__
# include "libunwind-sh.h"
#elif defined __i386__
# include "libunwind-x86.h"
#elif defined __x86_64__
# include "libunwind-x86_64.h"
#elif defined __tilegx__
# include "libunwind-tilegx.h"
#else
# error "Unsupported arch"
#endif
#else /* UNW_REMOTE_ONLY */
# include "libunwind-x86_64.h"
#endif /* UNW_REMOTE_ONLY */
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