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Fix a build warning in scripts/mod/file2alias.c

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On some systems, __used is already defined in sys/cdefs.h and causes
a build warning:

scripts/mod/file2alias.c:85:1: warning: "__used" redefined
In file included from /usr/include/stdio.h:64,
                 from scripts/mod/modpost.h:1,
		                  from scripts/mod/file2alias.c:13:
				  /usr/include/sys/cdefs.h:146:1: warning: this is the location of the previous definition

This adds an extra check before defining the __used macro to see if
the macro was already defined elsewhere.

Signed-off-by: Daniel Tang <dt.tangr@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Daniel Tang 2013-06-09 12:33:55 +10:00 committed by Michal Marek
parent bd70134396
commit 04130cc973
1 changed files with 6 additions and 4 deletions
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scripts/mod/file2alias.c
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@ -79,10 +79,12 @@ struct devtable **__start___devtable, **__stop___devtable;
extern struct devtable *__start___devtable[], *__stop___devtable[];
#endif /* __MACH__ */
#if __GNUC__ == 3 && __GNUC_MINOR__ < 3
# define __used __attribute__((__unused__))
#else
# define __used __attribute__((__used__))
#if !defined(__used)
# if __GNUC__ == 3 && __GNUC_MINOR__ < 3
# define __used __attribute__((__unused__))
# else
# define __used __attribute__((__used__))
# endif
#endif
/* Define a variable f that holds the value of field f of struct devid