Build log with warnings (Debian hardened flags)

I get some warnings during build with debian hardened options (I'm building an 
"official" debian package). We should avoid that kind of warnings to get a 
chance to publish the package

main.c:198:5: warning: ignoring return value of ‘dup’, declared with 
attribute warn_unused_result [-Wunused-result]
main.c:199:5: warning: ignoring return value of ‘dup’, declared with 
attribute warn_unused_result [-Wunused-result]
main.c:202:7: warning: ignoring return value of ‘chdir’, declared with 
attribute warn_unused_result [-Wunused-result]
main.c: In function ‘lockfile’:
main.c:92:7: warning: ignoring return value of ‘write’, declared with 
attribute warn_unused_result [-Wunused-result]
ban.c: In function ‘Ban_saveBanFile’:
ban.c:257:11: warning: format ‘%d’ expects argument of type ‘int’, but 
argument 6 has type ‘time_t’ [-Wformat]

What version of the product are you using? On what operating system?
0.2.10 on Debian Wheezy.

Is this possible to handle the results of those functions calls (to get rid of 
those warnings). Will appreciate it.

Cheers!

Original issue reported on code.google.com by pierre.h...@gmail.com on 9 Jan 2013 at 10:54

tst2005googlecode / umurmur

Build log with warnings (Debian hardened flags) #38