strace doesn't build with older glibc versions (loop.c breaks)

[Rolf Eike Beer]

Hi,

I try to build strace 4.8 against an old glibc (2.3.4). This breaks multiple 
times in loop.c. The failures I found so far are:

-the glibc <linux/loop.h> forbids the header to be used from glibc using 
programs, because glibc uses a 32 bit dev_t, which would cause wrong struct 
layout in loop_info. I fixed this by this before including <linux/loop.h>:

#undef dev_t
#define dev_t unsigned short

-LO_CRYPT_CRYPTOAPI is not defined in that version of the header (should be 
18)

-struct loop_info64 isn't defined in that version of the header

-LOOP_SET_STATUS64, LOOP_GET_STATUS64, and LOOP_CHANGE_FD are not defined in 
that version of the header

I just copied the neccessary definitions into loop.c to be able to build 
locally, but I guess this should be done by some proper configure checks.

For easier testing I have attached the version of the file that I have with 
that old glibc.

Greetings,

Eike
-- 
Rolf Eike Beer, emlix GmbH, http://www.emlix.com
Fon +49 551 30664-0, Fax +49 551 30664-11
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